diff --git a/libcxx/test/libcxx/algorithms/alg.sorting/assert.min.max.pass.cpp b/libcxx/test/libcxx/algorithms/alg.sorting/assert.min.max.pass.cpp
--- a/libcxx/test/libcxx/algorithms/alg.sorting/assert.min.max.pass.cpp
+++ b/libcxx/test/libcxx/algorithms/alg.sorting/assert.min.max.pass.cpp
@@ -10,7 +10,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <algorithm>
diff --git a/libcxx/test/libcxx/assertions/customize_verbose_abort.link-time.pass.cpp b/libcxx/test/libcxx/assertions/customize_verbose_abort.link-time.pass.cpp
--- a/libcxx/test/libcxx/assertions/customize_verbose_abort.link-time.pass.cpp
+++ b/libcxx/test/libcxx/assertions/customize_verbose_abort.link-time.pass.cpp
@@ -12,7 +12,7 @@
 
 // We flag uses of the verbose termination function in older dylibs at compile-time to avoid runtime
 // failures when back-deploying.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 
 #include <cstdlib>
 
diff --git a/libcxx/test/libcxx/containers/sequences/array/array.zero/assert.back.pass.cpp b/libcxx/test/libcxx/containers/sequences/array/array.zero/assert.back.pass.cpp
--- a/libcxx/test/libcxx/containers/sequences/array/array.zero/assert.back.pass.cpp
+++ b/libcxx/test/libcxx/containers/sequences/array/array.zero/assert.back.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // test that array<T, 0>::back() triggers an assertion
diff --git a/libcxx/test/libcxx/containers/sequences/array/array.zero/assert.front.pass.cpp b/libcxx/test/libcxx/containers/sequences/array/array.zero/assert.front.pass.cpp
--- a/libcxx/test/libcxx/containers/sequences/array/array.zero/assert.front.pass.cpp
+++ b/libcxx/test/libcxx/containers/sequences/array/array.zero/assert.front.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // test that array<T, 0>::back() triggers an assertion
diff --git a/libcxx/test/libcxx/containers/sequences/array/array.zero/assert.subscript.pass.cpp b/libcxx/test/libcxx/containers/sequences/array/array.zero/assert.subscript.pass.cpp
--- a/libcxx/test/libcxx/containers/sequences/array/array.zero/assert.subscript.pass.cpp
+++ b/libcxx/test/libcxx/containers/sequences/array/array.zero/assert.subscript.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // test that array<T, 0>::operator[] triggers an assertion
diff --git a/libcxx/test/libcxx/containers/sequences/deque/assert.pop_back.empty.pass.cpp b/libcxx/test/libcxx/containers/sequences/deque/assert.pop_back.empty.pass.cpp
--- a/libcxx/test/libcxx/containers/sequences/deque/assert.pop_back.empty.pass.cpp
+++ b/libcxx/test/libcxx/containers/sequences/deque/assert.pop_back.empty.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <deque>
diff --git a/libcxx/test/libcxx/containers/sequences/list/list.modifiers/assert.erase_iter.end.pass.cpp b/libcxx/test/libcxx/containers/sequences/list/list.modifiers/assert.erase_iter.end.pass.cpp
--- a/libcxx/test/libcxx/containers/sequences/list/list.modifiers/assert.erase_iter.end.pass.cpp
+++ b/libcxx/test/libcxx/containers/sequences/list/list.modifiers/assert.erase_iter.end.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <list>
diff --git a/libcxx/test/libcxx/containers/sequences/list/list.modifiers/assert.pop_back.empty.pass.cpp b/libcxx/test/libcxx/containers/sequences/list/list.modifiers/assert.pop_back.empty.pass.cpp
--- a/libcxx/test/libcxx/containers/sequences/list/list.modifiers/assert.pop_back.empty.pass.cpp
+++ b/libcxx/test/libcxx/containers/sequences/list/list.modifiers/assert.pop_back.empty.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <list>
diff --git a/libcxx/test/libcxx/containers/sequences/vector/assert.back.empty.pass.cpp b/libcxx/test/libcxx/containers/sequences/vector/assert.back.empty.pass.cpp
--- a/libcxx/test/libcxx/containers/sequences/vector/assert.back.empty.pass.cpp
+++ b/libcxx/test/libcxx/containers/sequences/vector/assert.back.empty.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <vector>
diff --git a/libcxx/test/libcxx/containers/sequences/vector/assert.cback.empty.pass.cpp b/libcxx/test/libcxx/containers/sequences/vector/assert.cback.empty.pass.cpp
--- a/libcxx/test/libcxx/containers/sequences/vector/assert.cback.empty.pass.cpp
+++ b/libcxx/test/libcxx/containers/sequences/vector/assert.cback.empty.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <vector>
diff --git a/libcxx/test/libcxx/containers/sequences/vector/assert.cfront.empty.pass.cpp b/libcxx/test/libcxx/containers/sequences/vector/assert.cfront.empty.pass.cpp
--- a/libcxx/test/libcxx/containers/sequences/vector/assert.cfront.empty.pass.cpp
+++ b/libcxx/test/libcxx/containers/sequences/vector/assert.cfront.empty.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <vector>
diff --git a/libcxx/test/libcxx/containers/sequences/vector/assert.cindex.oob.pass.cpp b/libcxx/test/libcxx/containers/sequences/vector/assert.cindex.oob.pass.cpp
--- a/libcxx/test/libcxx/containers/sequences/vector/assert.cindex.oob.pass.cpp
+++ b/libcxx/test/libcxx/containers/sequences/vector/assert.cindex.oob.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <vector>
diff --git a/libcxx/test/libcxx/containers/sequences/vector/assert.front.empty.pass.cpp b/libcxx/test/libcxx/containers/sequences/vector/assert.front.empty.pass.cpp
--- a/libcxx/test/libcxx/containers/sequences/vector/assert.front.empty.pass.cpp
+++ b/libcxx/test/libcxx/containers/sequences/vector/assert.front.empty.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <vector>
diff --git a/libcxx/test/libcxx/containers/sequences/vector/assert.index.oob.pass.cpp b/libcxx/test/libcxx/containers/sequences/vector/assert.index.oob.pass.cpp
--- a/libcxx/test/libcxx/containers/sequences/vector/assert.index.oob.pass.cpp
+++ b/libcxx/test/libcxx/containers/sequences/vector/assert.index.oob.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <vector>
diff --git a/libcxx/test/libcxx/containers/sequences/vector/assert.pop_back.empty.pass.cpp b/libcxx/test/libcxx/containers/sequences/vector/assert.pop_back.empty.pass.cpp
--- a/libcxx/test/libcxx/containers/sequences/vector/assert.pop_back.empty.pass.cpp
+++ b/libcxx/test/libcxx/containers/sequences/vector/assert.pop_back.empty.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <vector>
diff --git a/libcxx/test/libcxx/containers/unord/unord.map/assert.bucket.pass.cpp b/libcxx/test/libcxx/containers/unord/unord.map/assert.bucket.pass.cpp
--- a/libcxx/test/libcxx/containers/unord/unord.map/assert.bucket.pass.cpp
+++ b/libcxx/test/libcxx/containers/unord/unord.map/assert.bucket.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <unordered_map>
diff --git a/libcxx/test/libcxx/containers/unord/unord.map/assert.bucket_size.pass.cpp b/libcxx/test/libcxx/containers/unord/unord.map/assert.bucket_size.pass.cpp
--- a/libcxx/test/libcxx/containers/unord/unord.map/assert.bucket_size.pass.cpp
+++ b/libcxx/test/libcxx/containers/unord/unord.map/assert.bucket_size.pass.cpp
@@ -16,7 +16,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <unordered_map>
diff --git a/libcxx/test/libcxx/containers/unord/unord.map/assert.max_load_factor.pass.cpp b/libcxx/test/libcxx/containers/unord/unord.map/assert.max_load_factor.pass.cpp
--- a/libcxx/test/libcxx/containers/unord/unord.map/assert.max_load_factor.pass.cpp
+++ b/libcxx/test/libcxx/containers/unord/unord.map/assert.max_load_factor.pass.cpp
@@ -17,7 +17,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <unordered_map>
diff --git a/libcxx/test/libcxx/containers/unord/unord.multimap/assert.bucket.pass.cpp b/libcxx/test/libcxx/containers/unord/unord.multimap/assert.bucket.pass.cpp
--- a/libcxx/test/libcxx/containers/unord/unord.multimap/assert.bucket.pass.cpp
+++ b/libcxx/test/libcxx/containers/unord/unord.multimap/assert.bucket.pass.cpp
@@ -16,7 +16,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <unordered_map>
diff --git a/libcxx/test/libcxx/containers/unord/unord.multimap/assert.bucket_size.pass.cpp b/libcxx/test/libcxx/containers/unord/unord.multimap/assert.bucket_size.pass.cpp
--- a/libcxx/test/libcxx/containers/unord/unord.multimap/assert.bucket_size.pass.cpp
+++ b/libcxx/test/libcxx/containers/unord/unord.multimap/assert.bucket_size.pass.cpp
@@ -16,7 +16,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <unordered_map>
diff --git a/libcxx/test/libcxx/containers/unord/unord.multimap/assert.max_load_factor.pass.cpp b/libcxx/test/libcxx/containers/unord/unord.multimap/assert.max_load_factor.pass.cpp
--- a/libcxx/test/libcxx/containers/unord/unord.multimap/assert.max_load_factor.pass.cpp
+++ b/libcxx/test/libcxx/containers/unord/unord.multimap/assert.max_load_factor.pass.cpp
@@ -17,7 +17,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <unordered_map>
diff --git a/libcxx/test/libcxx/containers/unord/unord.multiset/assert.bucket.pass.cpp b/libcxx/test/libcxx/containers/unord/unord.multiset/assert.bucket.pass.cpp
--- a/libcxx/test/libcxx/containers/unord/unord.multiset/assert.bucket.pass.cpp
+++ b/libcxx/test/libcxx/containers/unord/unord.multiset/assert.bucket.pass.cpp
@@ -16,7 +16,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <unordered_set>
diff --git a/libcxx/test/libcxx/containers/unord/unord.multiset/assert.bucket_size.pass.cpp b/libcxx/test/libcxx/containers/unord/unord.multiset/assert.bucket_size.pass.cpp
--- a/libcxx/test/libcxx/containers/unord/unord.multiset/assert.bucket_size.pass.cpp
+++ b/libcxx/test/libcxx/containers/unord/unord.multiset/assert.bucket_size.pass.cpp
@@ -16,7 +16,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <unordered_set>
diff --git a/libcxx/test/libcxx/containers/unord/unord.multiset/assert.max_load_factor.pass.cpp b/libcxx/test/libcxx/containers/unord/unord.multiset/assert.max_load_factor.pass.cpp
--- a/libcxx/test/libcxx/containers/unord/unord.multiset/assert.max_load_factor.pass.cpp
+++ b/libcxx/test/libcxx/containers/unord/unord.multiset/assert.max_load_factor.pass.cpp
@@ -17,7 +17,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <unordered_set>
diff --git a/libcxx/test/libcxx/containers/unord/unord.set/assert.bucket.pass.cpp b/libcxx/test/libcxx/containers/unord/unord.set/assert.bucket.pass.cpp
--- a/libcxx/test/libcxx/containers/unord/unord.set/assert.bucket.pass.cpp
+++ b/libcxx/test/libcxx/containers/unord/unord.set/assert.bucket.pass.cpp
@@ -16,7 +16,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <unordered_set>
diff --git a/libcxx/test/libcxx/containers/unord/unord.set/assert.bucket_size.pass.cpp b/libcxx/test/libcxx/containers/unord/unord.set/assert.bucket_size.pass.cpp
--- a/libcxx/test/libcxx/containers/unord/unord.set/assert.bucket_size.pass.cpp
+++ b/libcxx/test/libcxx/containers/unord/unord.set/assert.bucket_size.pass.cpp
@@ -16,7 +16,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <unordered_set>
diff --git a/libcxx/test/libcxx/containers/unord/unord.set/assert.max_load_factor.pass.cpp b/libcxx/test/libcxx/containers/unord/unord.set/assert.max_load_factor.pass.cpp
--- a/libcxx/test/libcxx/containers/unord/unord.set/assert.max_load_factor.pass.cpp
+++ b/libcxx/test/libcxx/containers/unord/unord.set/assert.max_load_factor.pass.cpp
@@ -17,7 +17,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <unordered_set>
diff --git a/libcxx/test/libcxx/containers/views/views.span/span.cons/assert.iter_sent.pass.cpp b/libcxx/test/libcxx/containers/views/views.span/span.cons/assert.iter_sent.pass.cpp
--- a/libcxx/test/libcxx/containers/views/views.span/span.cons/assert.iter_sent.pass.cpp
+++ b/libcxx/test/libcxx/containers/views/views.span/span.cons/assert.iter_sent.pass.cpp
@@ -19,7 +19,7 @@
 // Check that we ensure that `[it, sent)` is a valid range.
 
 // REQUIRES: has-unix-headers
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <array>
diff --git a/libcxx/test/libcxx/containers/views/views.span/span.cons/assert.iter_size.pass.cpp b/libcxx/test/libcxx/containers/views/views.span/span.cons/assert.iter_size.pass.cpp
--- a/libcxx/test/libcxx/containers/views/views.span/span.cons/assert.iter_size.pass.cpp
+++ b/libcxx/test/libcxx/containers/views/views.span/span.cons/assert.iter_size.pass.cpp
@@ -16,7 +16,7 @@
 // dynamic_extent version.
 
 // REQUIRES: has-unix-headers
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <array>
diff --git a/libcxx/test/libcxx/containers/views/views.span/span.cons/assert.other_span.pass.cpp b/libcxx/test/libcxx/containers/views/views.span/span.cons/assert.other_span.pass.cpp
--- a/libcxx/test/libcxx/containers/views/views.span/span.cons/assert.other_span.pass.cpp
+++ b/libcxx/test/libcxx/containers/views/views.span/span.cons/assert.other_span.pass.cpp
@@ -14,7 +14,7 @@
 // Check that we ensure `other.size() == Extent`.
 
 // REQUIRES: has-unix-headers
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <array>
diff --git a/libcxx/test/libcxx/containers/views/views.span/span.cons/assert.range.pass.cpp b/libcxx/test/libcxx/containers/views/views.span/span.cons/assert.range.pass.cpp
--- a/libcxx/test/libcxx/containers/views/views.span/span.cons/assert.range.pass.cpp
+++ b/libcxx/test/libcxx/containers/views/views.span/span.cons/assert.range.pass.cpp
@@ -14,7 +14,7 @@
 // Check that we ensure `size(r) == Extent`.
 
 // REQUIRES: has-unix-headers
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <span>
diff --git a/libcxx/test/libcxx/containers/views/views.span/span.elem/assert.back.pass.cpp b/libcxx/test/libcxx/containers/views/views.span/span.elem/assert.back.pass.cpp
--- a/libcxx/test/libcxx/containers/views/views.span/span.elem/assert.back.pass.cpp
+++ b/libcxx/test/libcxx/containers/views/views.span/span.elem/assert.back.pass.cpp
@@ -14,7 +14,7 @@
 // Make sure that accessing a span out-of-bounds triggers an assertion.
 
 // REQUIRES: has-unix-headers
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <array>
diff --git a/libcxx/test/libcxx/containers/views/views.span/span.elem/assert.front.pass.cpp b/libcxx/test/libcxx/containers/views/views.span/span.elem/assert.front.pass.cpp
--- a/libcxx/test/libcxx/containers/views/views.span/span.elem/assert.front.pass.cpp
+++ b/libcxx/test/libcxx/containers/views/views.span/span.elem/assert.front.pass.cpp
@@ -14,7 +14,7 @@
 // Make sure that accessing a span out-of-bounds triggers an assertion.
 
 // REQUIRES: has-unix-headers
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <array>
diff --git a/libcxx/test/libcxx/containers/views/views.span/span.elem/assert.op_idx.pass.cpp b/libcxx/test/libcxx/containers/views/views.span/span.elem/assert.op_idx.pass.cpp
--- a/libcxx/test/libcxx/containers/views/views.span/span.elem/assert.op_idx.pass.cpp
+++ b/libcxx/test/libcxx/containers/views/views.span/span.elem/assert.op_idx.pass.cpp
@@ -14,7 +14,7 @@
 // Make sure that accessing a span out-of-bounds triggers an assertion.
 
 // REQUIRES: has-unix-headers
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <array>
diff --git a/libcxx/test/libcxx/containers/views/views.span/span.sub/assert.first.pass.cpp b/libcxx/test/libcxx/containers/views/views.span/span.sub/assert.first.pass.cpp
--- a/libcxx/test/libcxx/containers/views/views.span/span.sub/assert.first.pass.cpp
+++ b/libcxx/test/libcxx/containers/views/views.span/span.sub/assert.first.pass.cpp
@@ -14,7 +14,7 @@
 // Make sure that creating a sub-span with an incorrect number of elements triggers an assertion.
 
 // REQUIRES: has-unix-headers
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <array>
diff --git a/libcxx/test/libcxx/containers/views/views.span/span.sub/assert.last.pass.cpp b/libcxx/test/libcxx/containers/views/views.span/span.sub/assert.last.pass.cpp
--- a/libcxx/test/libcxx/containers/views/views.span/span.sub/assert.last.pass.cpp
+++ b/libcxx/test/libcxx/containers/views/views.span/span.sub/assert.last.pass.cpp
@@ -14,7 +14,7 @@
 // Make sure that creating a sub-span with an incorrect number of elements triggers an assertion.
 
 // REQUIRES: has-unix-headers
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <array>
diff --git a/libcxx/test/libcxx/containers/views/views.span/span.sub/assert.subspan.pass.cpp b/libcxx/test/libcxx/containers/views/views.span/span.sub/assert.subspan.pass.cpp
--- a/libcxx/test/libcxx/containers/views/views.span/span.sub/assert.subspan.pass.cpp
+++ b/libcxx/test/libcxx/containers/views/views.span/span.sub/assert.subspan.pass.cpp
@@ -18,7 +18,7 @@
 // Make sure that creating a sub-span with an incorrect number of elements triggers an assertion.
 
 // REQUIRES: has-unix-headers
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <array>
diff --git a/libcxx/test/libcxx/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/assert.deallocate.pass.cpp b/libcxx/test/libcxx/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/assert.deallocate.pass.cpp
--- a/libcxx/test/libcxx/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/assert.deallocate.pass.cpp
+++ b/libcxx/test/libcxx/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/assert.deallocate.pass.cpp
@@ -14,7 +14,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
diff --git a/libcxx/test/libcxx/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.mem/assert.deallocate.pass.cpp b/libcxx/test/libcxx/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.mem/assert.deallocate.pass.cpp
--- a/libcxx/test/libcxx/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.mem/assert.deallocate.pass.cpp
+++ b/libcxx/test/libcxx/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.mem/assert.deallocate.pass.cpp
@@ -14,7 +14,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
diff --git a/libcxx/test/libcxx/experimental/memory/memory.resource.global/global_memory_resource_lifetime.pass.cpp b/libcxx/test/libcxx/experimental/memory/memory.resource.global/global_memory_resource_lifetime.pass.cpp
--- a/libcxx/test/libcxx/experimental/memory/memory.resource.global/global_memory_resource_lifetime.pass.cpp
+++ b/libcxx/test/libcxx/experimental/memory/memory.resource.global/global_memory_resource_lifetime.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/libcxx/test/libcxx/experimental/memory/memory.resource.global/new_delete_resource_lifetime.pass.cpp b/libcxx/test/libcxx/experimental/memory/memory.resource.global/new_delete_resource_lifetime.pass.cpp
--- a/libcxx/test/libcxx/experimental/memory/memory.resource.global/new_delete_resource_lifetime.pass.cpp
+++ b/libcxx/test/libcxx/experimental/memory/memory.resource.global/new_delete_resource_lifetime.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/libcxx/test/libcxx/input.output/filesystems/class.path/path.itr/assert.iterator.pass.cpp b/libcxx/test/libcxx/input.output/filesystems/class.path/path.itr/assert.iterator.pass.cpp
--- a/libcxx/test/libcxx/input.output/filesystems/class.path/path.itr/assert.iterator.pass.cpp
+++ b/libcxx/test/libcxx/input.output/filesystems/class.path/path.itr/assert.iterator.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // <filesystem>
diff --git a/libcxx/test/libcxx/iterators/assert.advance.pass.cpp b/libcxx/test/libcxx/iterators/assert.advance.pass.cpp
--- a/libcxx/test/libcxx/iterators/assert.advance.pass.cpp
+++ b/libcxx/test/libcxx/iterators/assert.advance.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // <list>
diff --git a/libcxx/test/libcxx/iterators/assert.next.pass.cpp b/libcxx/test/libcxx/iterators/assert.next.pass.cpp
--- a/libcxx/test/libcxx/iterators/assert.next.pass.cpp
+++ b/libcxx/test/libcxx/iterators/assert.next.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // <list>
diff --git a/libcxx/test/libcxx/iterators/assert.prev.pass.cpp b/libcxx/test/libcxx/iterators/assert.prev.pass.cpp
--- a/libcxx/test/libcxx/iterators/assert.prev.pass.cpp
+++ b/libcxx/test/libcxx/iterators/assert.prev.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // <list>
diff --git a/libcxx/test/libcxx/iterators/bounded_iter/dereference.pass.cpp b/libcxx/test/libcxx/iterators/bounded_iter/dereference.pass.cpp
--- a/libcxx/test/libcxx/iterators/bounded_iter/dereference.pass.cpp
+++ b/libcxx/test/libcxx/iterators/bounded_iter/dereference.pass.cpp
@@ -13,7 +13,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <iterator>
diff --git a/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_bidirectional_iterator.compile.pass.cpp b/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_bidirectional_iterator.compile.pass.cpp
--- a/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_bidirectional_iterator.compile.pass.cpp
+++ b/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_bidirectional_iterator.compile.pass.cpp
@@ -8,8 +8,8 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test uses iterator types from std::filesystem, which were introduced in macOS 10.15.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// This test uses iterator types from std::filesystem
+// XFAIL: availability-filesystem-missing
 
 // template<class I>
 // concept __iterator_traits_detail::__cpp17_bidirectional_iterator;
diff --git a/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_forward_iterator.compile.pass.cpp b/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_forward_iterator.compile.pass.cpp
--- a/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_forward_iterator.compile.pass.cpp
+++ b/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_forward_iterator.compile.pass.cpp
@@ -8,8 +8,8 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test uses iterator types from std::filesystem, which were introduced in macOS 10.15.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// This test uses iterator types from std::filesystem
+// XFAIL: availability-filesystem-missing
 
 // template<class I>
 // concept __iterator_traits_detail::__cpp17_forward_iterator;
diff --git a/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_input_iterator.compile.pass.cpp b/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_input_iterator.compile.pass.cpp
--- a/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_input_iterator.compile.pass.cpp
+++ b/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_input_iterator.compile.pass.cpp
@@ -8,8 +8,8 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test uses iterator types from std::filesystem, which were introduced in macOS 10.15.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// This test uses iterator types from std::filesystem
+// XFAIL: availability-filesystem-missing
 
 // template<class I>
 // concept __iterator_traits_detail::__cpp17_input_iterator;
diff --git a/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_iterator.compile.pass.cpp b/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_iterator.compile.pass.cpp
--- a/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_iterator.compile.pass.cpp
+++ b/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_iterator.compile.pass.cpp
@@ -8,8 +8,8 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test uses iterator types from std::filesystem, which were introduced in macOS 10.15.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// This test uses iterator types from std::filesystem
+// XFAIL: availability-filesystem-missing
 
 // template<class I>
 // concept __iterator_traits_detail::__cpp17_iterator;
diff --git a/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_random_access_iterator.compile.pass.cpp b/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_random_access_iterator.compile.pass.cpp
--- a/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_random_access_iterator.compile.pass.cpp
+++ b/libcxx/test/libcxx/iterators/iterator.requirements/iterator.assoc.types/iterator.traits/legacy_random_access_iterator.compile.pass.cpp
@@ -8,8 +8,8 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test uses iterator types from std::filesystem, which were introduced in macOS 10.15.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// This test uses iterator types from std::filesystem
+// XFAIL: availability-filesystem-missing
 
 // template<class I>
 // concept __iterator_traits_detail::__cpp17_random_access_iterator;
diff --git a/libcxx/test/libcxx/language.support/support.dynamic/aligned_alloc_availability.verify.cpp b/libcxx/test/libcxx/language.support/support.dynamic/aligned_alloc_availability.verify.cpp
--- a/libcxx/test/libcxx/language.support/support.dynamic/aligned_alloc_availability.verify.cpp
+++ b/libcxx/test/libcxx/language.support/support.dynamic/aligned_alloc_availability.verify.cpp
@@ -10,9 +10,7 @@
 // allocation/deallocation on deployment targets that don't support it (before macosx10.13).
 
 // UNSUPPORTED: c++03, c++11, c++14
-
-// Aligned allocation was not provided before macosx10.13.
-// REQUIRES: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// REQUIRES: availability-aligned_allocation-missing
 
 #include <new>
 #include <cstddef>
diff --git a/libcxx/test/libcxx/language.support/support.dynamic/libcpp_deallocate.sh.cpp b/libcxx/test/libcxx/language.support/support.dynamic/libcpp_deallocate.sh.cpp
--- a/libcxx/test/libcxx/language.support/support.dynamic/libcpp_deallocate.sh.cpp
+++ b/libcxx/test/libcxx/language.support/support.dynamic/libcpp_deallocate.sh.cpp
@@ -9,10 +9,9 @@
 // test libc++'s implementation of align_val_t, and the relevant new/delete
 // overloads in all dialects when -faligned-allocation is present.
 
-// The dylibs shipped before macosx10.13 do not contain the aligned allocation
-// functions, so trying to force using those with -faligned-allocation results
-// in a link error.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// Some dylibs do not contain the aligned allocation functions, so trying to force
+// using those with -faligned-allocation results in a link error.
+// XFAIL: availability-aligned_allocation-missing
 
 // Libcxx when built for z/OS doesn't contain the aligned allocation functions,
 // nor does the dynamic library shipped with z/OS.
diff --git a/libcxx/test/libcxx/language.support/support.dynamic/new_faligned_allocation.pass.cpp b/libcxx/test/libcxx/language.support/support.dynamic/new_faligned_allocation.pass.cpp
--- a/libcxx/test/libcxx/language.support/support.dynamic/new_faligned_allocation.pass.cpp
+++ b/libcxx/test/libcxx/language.support/support.dynamic/new_faligned_allocation.pass.cpp
@@ -9,10 +9,9 @@
 // test libc++'s implementation of align_val_t, and the relevant new/delete
 // overloads in all dialects when -faligned-allocation is present.
 
-// The dylibs shipped before macosx10.13 do not contain the aligned allocation
-// functions, so trying to force using those with -faligned-allocation results
-// in a link error.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// Some dylibs do not contain the aligned allocation functions, so trying to force
+// using those with -faligned-allocation results in a link error.
+// XFAIL: availability-aligned_allocation-missing
 
 // Libcxx when built for z/OS doesn't contain the aligned allocation functions,
 // nor does the dynamic library shipped with z/OS.
diff --git a/libcxx/test/libcxx/memory/aligned_allocation_macro.compile.pass.cpp b/libcxx/test/libcxx/memory/aligned_allocation_macro.compile.pass.cpp
--- a/libcxx/test/libcxx/memory/aligned_allocation_macro.compile.pass.cpp
+++ b/libcxx/test/libcxx/memory/aligned_allocation_macro.compile.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 #include <new>
 
diff --git a/libcxx/test/libcxx/ranges/range.adaptors/range.drop.while/assert.begin.pass.cpp b/libcxx/test/libcxx/ranges/range.adaptors/range.drop.while/assert.begin.pass.cpp
--- a/libcxx/test/libcxx/ranges/range.adaptors/range.drop.while/assert.begin.pass.cpp
+++ b/libcxx/test/libcxx/ranges/range.adaptors/range.drop.while/assert.begin.pass.cpp
@@ -13,7 +13,7 @@
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: no-exceptions
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <ranges>
diff --git a/libcxx/test/libcxx/strings/basic.string/string.access/assert.back.pass.cpp b/libcxx/test/libcxx/strings/basic.string/string.access/assert.back.pass.cpp
--- a/libcxx/test/libcxx/strings/basic.string/string.access/assert.back.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/string.access/assert.back.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <string>
diff --git a/libcxx/test/libcxx/strings/basic.string/string.access/assert.cback.pass.cpp b/libcxx/test/libcxx/strings/basic.string/string.access/assert.cback.pass.cpp
--- a/libcxx/test/libcxx/strings/basic.string/string.access/assert.cback.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/string.access/assert.cback.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <string>
diff --git a/libcxx/test/libcxx/strings/basic.string/string.access/assert.cfront.pass.cpp b/libcxx/test/libcxx/strings/basic.string/string.access/assert.cfront.pass.cpp
--- a/libcxx/test/libcxx/strings/basic.string/string.access/assert.cfront.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/string.access/assert.cfront.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <string>
diff --git a/libcxx/test/libcxx/strings/basic.string/string.access/assert.cindex.pass.cpp b/libcxx/test/libcxx/strings/basic.string/string.access/assert.cindex.pass.cpp
--- a/libcxx/test/libcxx/strings/basic.string/string.access/assert.cindex.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/string.access/assert.cindex.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <string>
diff --git a/libcxx/test/libcxx/strings/basic.string/string.access/assert.front.pass.cpp b/libcxx/test/libcxx/strings/basic.string/string.access/assert.front.pass.cpp
--- a/libcxx/test/libcxx/strings/basic.string/string.access/assert.front.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/string.access/assert.front.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <string>
diff --git a/libcxx/test/libcxx/strings/basic.string/string.access/assert.index.pass.cpp b/libcxx/test/libcxx/strings/basic.string/string.access/assert.index.pass.cpp
--- a/libcxx/test/libcxx/strings/basic.string/string.access/assert.index.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/string.access/assert.index.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <string>
diff --git a/libcxx/test/libcxx/strings/basic.string/string.capacity/PR53170.pass.cpp b/libcxx/test/libcxx/strings/basic.string/string.capacity/PR53170.pass.cpp
--- a/libcxx/test/libcxx/strings/basic.string/string.capacity/PR53170.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/string.capacity/PR53170.pass.cpp
@@ -22,8 +22,7 @@
 // Reported as https://llvm.org/PR53170.
 
 // reserve(n) used to shrink the string until https://llvm.org/D117332 was shipped.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
 
 #include <string>
 #include <stdexcept>
diff --git a/libcxx/test/libcxx/strings/basic.string/string.modifiers/assert.erase_iter.null.pass.cpp b/libcxx/test/libcxx/strings/basic.string/string.modifiers/assert.erase_iter.null.pass.cpp
--- a/libcxx/test/libcxx/strings/basic.string/string.modifiers/assert.erase_iter.null.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/string.modifiers/assert.erase_iter.null.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <string>
diff --git a/libcxx/test/libcxx/strings/basic.string/string.modifiers/assert.pop_back.pass.cpp b/libcxx/test/libcxx/strings/basic.string/string.modifiers/assert.pop_back.pass.cpp
--- a/libcxx/test/libcxx/strings/basic.string/string.modifiers/assert.pop_back.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/string.modifiers/assert.pop_back.pass.cpp
@@ -12,7 +12,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <string>
diff --git a/libcxx/test/libcxx/strings/string.view/assert.ctor.pointer.pass.cpp b/libcxx/test/libcxx/strings/string.view/assert.ctor.pointer.pass.cpp
--- a/libcxx/test/libcxx/strings/string.view/assert.ctor.pointer.pass.cpp
+++ b/libcxx/test/libcxx/strings/string.view/assert.ctor.pointer.pass.cpp
@@ -10,7 +10,7 @@
 // UNSUPPORTED: c++11, c++14
 
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // Construct a string_view from a null pointer
diff --git a/libcxx/test/libcxx/thread/atomic.availability.verify.cpp b/libcxx/test/libcxx/thread/atomic.availability.verify.cpp
--- a/libcxx/test/libcxx/thread/atomic.availability.verify.cpp
+++ b/libcxx/test/libcxx/thread/atomic.availability.verify.cpp
@@ -7,7 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11
-// REQUIRES: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// REQUIRES: availability-synchronization_library-missing
 
 // Test the availability markup on the C++20 Synchronization Library
 // additions to <atomic>.
diff --git a/libcxx/test/libcxx/thread/barrier.availability.verify.cpp b/libcxx/test/libcxx/thread/barrier.availability.verify.cpp
--- a/libcxx/test/libcxx/thread/barrier.availability.verify.cpp
+++ b/libcxx/test/libcxx/thread/barrier.availability.verify.cpp
@@ -7,7 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11
-// REQUIRES: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// REQUIRES: availability-synchronization_library-missing
 
 // Test the availability markup on std::barrier.
 
diff --git a/libcxx/test/libcxx/thread/futures/futures.promise/assert.set_exception.pass.cpp b/libcxx/test/libcxx/thread/futures/futures.promise/assert.set_exception.pass.cpp
--- a/libcxx/test/libcxx/thread/futures/futures.promise/assert.set_exception.pass.cpp
+++ b/libcxx/test/libcxx/thread/futures/futures.promise/assert.set_exception.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03, no-threads
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // <future>
diff --git a/libcxx/test/libcxx/thread/futures/futures.promise/assert.set_exception_at_thread_exit.pass.cpp b/libcxx/test/libcxx/thread/futures/futures.promise/assert.set_exception_at_thread_exit.pass.cpp
--- a/libcxx/test/libcxx/thread/futures/futures.promise/assert.set_exception_at_thread_exit.pass.cpp
+++ b/libcxx/test/libcxx/thread/futures/futures.promise/assert.set_exception_at_thread_exit.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03, no-threads
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // <future>
diff --git a/libcxx/test/libcxx/thread/latch.availability.verify.cpp b/libcxx/test/libcxx/thread/latch.availability.verify.cpp
--- a/libcxx/test/libcxx/thread/latch.availability.verify.cpp
+++ b/libcxx/test/libcxx/thread/latch.availability.verify.cpp
@@ -7,7 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11
-// REQUIRES: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// REQUIRES: availability-synchronization_library-missing
 
 // Test the availability markup on std::latch.
 
diff --git a/libcxx/test/libcxx/thread/semaphore.availability.verify.cpp b/libcxx/test/libcxx/thread/semaphore.availability.verify.cpp
--- a/libcxx/test/libcxx/thread/semaphore.availability.verify.cpp
+++ b/libcxx/test/libcxx/thread/semaphore.availability.verify.cpp
@@ -7,7 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11
-// REQUIRES: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// REQUIRES: availability-synchronization_library-missing
 
 // Test the availability markup on std::counting_semaphore and std::binary_semaphore.
 
diff --git a/libcxx/test/libcxx/utilities/assert.exception_guard.no_exceptions.pass.cpp b/libcxx/test/libcxx/utilities/assert.exception_guard.no_exceptions.pass.cpp
--- a/libcxx/test/libcxx/utilities/assert.exception_guard.no_exceptions.pass.cpp
+++ b/libcxx/test/libcxx/utilities/assert.exception_guard.no_exceptions.pass.cpp
@@ -9,7 +9,7 @@
 // UNSUPPORTED: c++03
 
 // REQUIRES: has-unix-headers
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -fno-exceptions -D_LIBCPP_ENABLE_ASSERTIONS
 
 // ADDITIONAL_COMPILE_FLAGS: -Wno-private-header
diff --git a/libcxx/test/libcxx/utilities/expected/expected.expected/assert.arrow.pass.cpp b/libcxx/test/libcxx/utilities/expected/expected.expected/assert.arrow.pass.cpp
--- a/libcxx/test/libcxx/utilities/expected/expected.expected/assert.arrow.pass.cpp
+++ b/libcxx/test/libcxx/utilities/expected/expected.expected/assert.arrow.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // constexpr const T* operator->() const noexcept;
diff --git a/libcxx/test/libcxx/utilities/expected/expected.expected/assert.deref.pass.cpp b/libcxx/test/libcxx/utilities/expected/expected.expected/assert.deref.pass.cpp
--- a/libcxx/test/libcxx/utilities/expected/expected.expected/assert.deref.pass.cpp
+++ b/libcxx/test/libcxx/utilities/expected/expected.expected/assert.deref.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // constexpr const T& operator*() const & noexcept;
diff --git a/libcxx/test/libcxx/utilities/expected/expected.expected/assert.error.pass.cpp b/libcxx/test/libcxx/utilities/expected/expected.expected/assert.error.pass.cpp
--- a/libcxx/test/libcxx/utilities/expected/expected.expected/assert.error.pass.cpp
+++ b/libcxx/test/libcxx/utilities/expected/expected.expected/assert.error.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // constexpr const E& error() const & noexcept;
diff --git a/libcxx/test/libcxx/utilities/expected/expected.void/assert.deref.pass.cpp b/libcxx/test/libcxx/utilities/expected/expected.void/assert.deref.pass.cpp
--- a/libcxx/test/libcxx/utilities/expected/expected.void/assert.deref.pass.cpp
+++ b/libcxx/test/libcxx/utilities/expected/expected.void/assert.deref.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // constexpr void operator*() const noexcept;
diff --git a/libcxx/test/libcxx/utilities/expected/expected.void/assert.error.pass.cpp b/libcxx/test/libcxx/utilities/expected/expected.void/assert.error.pass.cpp
--- a/libcxx/test/libcxx/utilities/expected/expected.void/assert.error.pass.cpp
+++ b/libcxx/test/libcxx/utilities/expected/expected.void/assert.error.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // constexpr const E& error() const & noexcept;
diff --git a/libcxx/test/libcxx/utilities/format/format.availability.verify.cpp b/libcxx/test/libcxx/utilities/format/format.availability.verify.cpp
--- a/libcxx/test/libcxx/utilities/format/format.availability.verify.cpp
+++ b/libcxx/test/libcxx/utilities/format/format.availability.verify.cpp
@@ -7,7 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// REQUIRES: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// REQUIRES: availability-fp_to_chars-missing
 
 // Ignore additional errors emitted by the compiler. Availability attributes cause other confusing errors
 // to be emitted because they cause overload resolution to behave differently, and hence mess with concept
diff --git a/libcxx/test/libcxx/utilities/optional/optional.object/optional.object.observe/assert.dereference.pass.cpp b/libcxx/test/libcxx/utilities/optional/optional.object/optional.object.observe/assert.dereference.pass.cpp
--- a/libcxx/test/libcxx/utilities/optional/optional.object/optional.object.observe/assert.dereference.pass.cpp
+++ b/libcxx/test/libcxx/utilities/optional/optional.object/optional.object.observe/assert.dereference.pass.cpp
@@ -15,7 +15,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <optional>
diff --git a/libcxx/test/libcxx/utilities/optional/optional.object/optional.object.observe/assert.op_arrow.pass.cpp b/libcxx/test/libcxx/utilities/optional/optional.object/optional.object.observe/assert.op_arrow.pass.cpp
--- a/libcxx/test/libcxx/utilities/optional/optional.object/optional.object.observe/assert.op_arrow.pass.cpp
+++ b/libcxx/test/libcxx/utilities/optional/optional.object/optional.object.observe/assert.op_arrow.pass.cpp
@@ -13,7 +13,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <optional>
diff --git a/libcxx/test/libcxx/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_piecewise_pair.pass.cpp b/libcxx/test/libcxx/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_piecewise_pair.pass.cpp
--- a/libcxx/test/libcxx/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_piecewise_pair.pass.cpp
+++ b/libcxx/test/libcxx/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_piecewise_pair.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/libcxx/test/libcxx/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_from_underaligned_buffer.pass.cpp b/libcxx/test/libcxx/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_from_underaligned_buffer.pass.cpp
--- a/libcxx/test/libcxx/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_from_underaligned_buffer.pass.cpp
+++ b/libcxx/test/libcxx/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_from_underaligned_buffer.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/libcxx/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_in_geometric_progression.pass.cpp b/libcxx/test/libcxx/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_in_geometric_progression.pass.cpp
--- a/libcxx/test/libcxx/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_in_geometric_progression.pass.cpp
+++ b/libcxx/test/libcxx/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_in_geometric_progression.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/libcxx/utilities/utility/mem.res/mem.res.pool/unsynchronized_buffer.pass.cpp b/libcxx/test/libcxx/utilities/utility/mem.res/mem.res.pool/unsynchronized_buffer.pass.cpp
--- a/libcxx/test/libcxx/utilities/utility/mem.res/mem.res.pool/unsynchronized_buffer.pass.cpp
+++ b/libcxx/test/libcxx/utilities/utility/mem.res/mem.res.pool/unsynchronized_buffer.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/pop.heap/assert.pop_heap.pass.cpp b/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/pop.heap/assert.pop_heap.pass.cpp
--- a/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/pop.heap/assert.pop_heap.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/pop.heap/assert.pop_heap.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // <algorithm>
diff --git a/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/pop.heap/assert.ranges_pop_heap.pass.cpp b/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/pop.heap/assert.ranges_pop_heap.pass.cpp
--- a/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/pop.heap/assert.ranges_pop_heap.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.sorting/alg.heap.operations/pop.heap/assert.ranges_pop_heap.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // <algorithm>
diff --git a/libcxx/test/std/algorithms/alg.sorting/alg.clamp/assert.ranges_clamp.pass.cpp b/libcxx/test/std/algorithms/alg.sorting/alg.clamp/assert.ranges_clamp.pass.cpp
--- a/libcxx/test/std/algorithms/alg.sorting/alg.clamp/assert.ranges_clamp.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.sorting/alg.clamp/assert.ranges_clamp.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // <algorithm>
diff --git a/libcxx/test/std/atomics/atomics.types.generic/general.compile.pass.cpp b/libcxx/test/std/atomics/atomics.types.generic/general.compile.pass.cpp
--- a/libcxx/test/std/atomics/atomics.types.generic/general.compile.pass.cpp
+++ b/libcxx/test/std/atomics/atomics.types.generic/general.compile.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <atomic>
 
diff --git a/libcxx/test/std/atomics/atomics.types.generic/pointer.compile.pass.cpp b/libcxx/test/std/atomics/atomics.types.generic/pointer.compile.pass.cpp
--- a/libcxx/test/std/atomics/atomics.types.generic/pointer.compile.pass.cpp
+++ b/libcxx/test/std/atomics/atomics.types.generic/pointer.compile.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <atomic>
 
diff --git a/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_notify_all.pass.cpp b/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_notify_all.pass.cpp
--- a/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_notify_all.pass.cpp
+++ b/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_notify_all.pass.cpp
@@ -10,8 +10,7 @@
 // XFAIL: c++03
 // XFAIL: !non-lockfree-atomics
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <atomic>
 
diff --git a/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_notify_one.pass.cpp b/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_notify_one.pass.cpp
--- a/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_notify_one.pass.cpp
+++ b/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_notify_one.pass.cpp
@@ -10,8 +10,7 @@
 // XFAIL: c++03
 // XFAIL: !non-lockfree-atomics
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <atomic>
 
diff --git a/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_wait.pass.cpp b/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_wait.pass.cpp
--- a/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_wait.pass.cpp
+++ b/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_wait.pass.cpp
@@ -10,8 +10,7 @@
 // XFAIL: c++03
 // XFAIL: !non-lockfree-atomics
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <atomic>
 
diff --git a/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_wait_explicit.pass.cpp b/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_wait_explicit.pass.cpp
--- a/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_wait_explicit.pass.cpp
+++ b/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_wait_explicit.pass.cpp
@@ -10,8 +10,7 @@
 // XFAIL: c++03
 // XFAIL: !non-lockfree-atomics
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <atomic>
 
diff --git a/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.functions.format.pass.cpp b/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.functions.format.pass.cpp
--- a/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.functions.format.pass.cpp
+++ b/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.functions.format.pass.cpp
@@ -11,8 +11,7 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // [container.adaptors.format]
 // For each of queue, priority_queue, and stack, the library provides the
diff --git a/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.functions.vformat.pass.cpp b/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.functions.vformat.pass.cpp
--- a/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.functions.vformat.pass.cpp
+++ b/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.functions.vformat.pass.cpp
@@ -11,8 +11,7 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // [container.adaptors.format]
 // For each of queue, priority_queue, and stack, the library provides the
diff --git a/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.pass.cpp b/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.pass.cpp
--- a/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.pass.cpp
+++ b/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.pass.cpp
@@ -12,8 +12,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // [container.adaptors.format]
 // For each of queue, priority_queue, and stack, the library provides the
diff --git a/libcxx/test/std/containers/iterator.rel_ops.compile.pass.cpp b/libcxx/test/std/containers/iterator.rel_ops.compile.pass.cpp
--- a/libcxx/test/std/containers/iterator.rel_ops.compile.pass.cpp
+++ b/libcxx/test/std/containers/iterator.rel_ops.compile.pass.cpp
@@ -7,9 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: no-filesystem
-
-// std::filesystem is unavailable prior to macOS 10.15
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// XFAIL: availaiblity-filesystem-missing
 
 // Make sure the various containers' iterators are not broken by the use of `std::rel_ops`.
 
diff --git a/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.functions.format.pass.cpp b/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.functions.format.pass.cpp
--- a/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.functions.format.pass.cpp
+++ b/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.functions.format.pass.cpp
@@ -12,8 +12,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <vector>
 
diff --git a/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.functions.vformat.pass.cpp b/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.functions.vformat.pass.cpp
--- a/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.functions.vformat.pass.cpp
+++ b/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.functions.vformat.pass.cpp
@@ -11,8 +11,7 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <vector>
 
diff --git a/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.ctor/default.pass.cpp b/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.ctor/default.pass.cpp
--- a/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.ctor/default.pass.cpp
+++ b/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.ctor/default.pass.cpp
@@ -11,10 +11,7 @@
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.eq/equal.pass.cpp b/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.eq/equal.pass.cpp
--- a/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.eq/equal.pass.cpp
+++ b/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.eq/equal.pass.cpp
@@ -11,10 +11,7 @@
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.eq/not_equal.pass.cpp b/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.eq/not_equal.pass.cpp
--- a/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.eq/not_equal.pass.cpp
+++ b/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.eq/not_equal.pass.cpp
@@ -11,10 +11,7 @@
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/allocate.pass.cpp b/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/allocate.pass.cpp
--- a/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/allocate.pass.cpp
+++ b/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/allocate.pass.cpp
@@ -11,10 +11,7 @@
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair.pass.cpp b/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair.pass.cpp
--- a/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair.pass.cpp
+++ b/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_const_lvalue_pair.pass.cpp b/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_const_lvalue_pair.pass.cpp
--- a/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_const_lvalue_pair.pass.cpp
+++ b/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_const_lvalue_pair.pass.cpp
@@ -11,10 +11,7 @@
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_rvalue.pass.cpp b/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_rvalue.pass.cpp
--- a/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_rvalue.pass.cpp
+++ b/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_rvalue.pass.cpp
@@ -11,10 +11,7 @@
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_values.pass.cpp b/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_values.pass.cpp
--- a/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_values.pass.cpp
+++ b/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_values.pass.cpp
@@ -11,10 +11,7 @@
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair.pass.cpp b/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair.pass.cpp
--- a/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair.pass.cpp
+++ b/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair.pass.cpp
@@ -11,10 +11,7 @@
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair_evil.pass.cpp b/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair_evil.pass.cpp
--- a/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair_evil.pass.cpp
+++ b/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair_evil.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_types.pass.cpp b/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_types.pass.cpp
--- a/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_types.pass.cpp
+++ b/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_types.pass.cpp
@@ -11,10 +11,7 @@
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/deallocate.pass.cpp b/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/deallocate.pass.cpp
--- a/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/deallocate.pass.cpp
+++ b/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/deallocate.pass.cpp
@@ -11,10 +11,7 @@
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/destroy.pass.cpp b/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/destroy.pass.cpp
--- a/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/destroy.pass.cpp
+++ b/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/destroy.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/resource.pass.cpp b/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/resource.pass.cpp
--- a/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/resource.pass.cpp
+++ b/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/resource.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/select_on_container_copy_construction.pass.cpp b/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/select_on_container_copy_construction.pass.cpp
--- a/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/select_on_container_copy_construction.pass.cpp
+++ b/libcxx/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/select_on_container_copy_construction.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/libcxx/test/std/experimental/memory/memory.resource.aliases/header_deque_synop.pass.cpp b/libcxx/test/std/experimental/memory/memory.resource.aliases/header_deque_synop.pass.cpp
--- a/libcxx/test/std/experimental/memory/memory.resource.aliases/header_deque_synop.pass.cpp
+++ b/libcxx/test/std/experimental/memory/memory.resource.aliases/header_deque_synop.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/deque>
 
diff --git a/libcxx/test/std/experimental/memory/memory.resource.aliases/header_forward_list_synop.pass.cpp b/libcxx/test/std/experimental/memory/memory.resource.aliases/header_forward_list_synop.pass.cpp
--- a/libcxx/test/std/experimental/memory/memory.resource.aliases/header_forward_list_synop.pass.cpp
+++ b/libcxx/test/std/experimental/memory/memory.resource.aliases/header_forward_list_synop.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/forward_list>
 
diff --git a/libcxx/test/std/experimental/memory/memory.resource.aliases/header_list_synop.pass.cpp b/libcxx/test/std/experimental/memory/memory.resource.aliases/header_list_synop.pass.cpp
--- a/libcxx/test/std/experimental/memory/memory.resource.aliases/header_list_synop.pass.cpp
+++ b/libcxx/test/std/experimental/memory/memory.resource.aliases/header_list_synop.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/list>
 
diff --git a/libcxx/test/std/experimental/memory/memory.resource.aliases/header_map_synop.pass.cpp b/libcxx/test/std/experimental/memory/memory.resource.aliases/header_map_synop.pass.cpp
--- a/libcxx/test/std/experimental/memory/memory.resource.aliases/header_map_synop.pass.cpp
+++ b/libcxx/test/std/experimental/memory/memory.resource.aliases/header_map_synop.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/map>
 
diff --git a/libcxx/test/std/experimental/memory/memory.resource.aliases/header_regex_synop.pass.cpp b/libcxx/test/std/experimental/memory/memory.resource.aliases/header_regex_synop.pass.cpp
--- a/libcxx/test/std/experimental/memory/memory.resource.aliases/header_regex_synop.pass.cpp
+++ b/libcxx/test/std/experimental/memory/memory.resource.aliases/header_regex_synop.pass.cpp
@@ -9,10 +9,7 @@
 // UNSUPPORTED: c++03
 // UNSUPPORTED: no-localization
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/regex>
 
diff --git a/libcxx/test/std/experimental/memory/memory.resource.aliases/header_set_synop.pass.cpp b/libcxx/test/std/experimental/memory/memory.resource.aliases/header_set_synop.pass.cpp
--- a/libcxx/test/std/experimental/memory/memory.resource.aliases/header_set_synop.pass.cpp
+++ b/libcxx/test/std/experimental/memory/memory.resource.aliases/header_set_synop.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/set>
 
diff --git a/libcxx/test/std/experimental/memory/memory.resource.aliases/header_string_synop.pass.cpp b/libcxx/test/std/experimental/memory/memory.resource.aliases/header_string_synop.pass.cpp
--- a/libcxx/test/std/experimental/memory/memory.resource.aliases/header_string_synop.pass.cpp
+++ b/libcxx/test/std/experimental/memory/memory.resource.aliases/header_string_synop.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/string>
 
diff --git a/libcxx/test/std/experimental/memory/memory.resource.aliases/header_unordered_map_synop.pass.cpp b/libcxx/test/std/experimental/memory/memory.resource.aliases/header_unordered_map_synop.pass.cpp
--- a/libcxx/test/std/experimental/memory/memory.resource.aliases/header_unordered_map_synop.pass.cpp
+++ b/libcxx/test/std/experimental/memory/memory.resource.aliases/header_unordered_map_synop.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/unordered_map>
 
diff --git a/libcxx/test/std/experimental/memory/memory.resource.aliases/header_unordered_set_synop.pass.cpp b/libcxx/test/std/experimental/memory/memory.resource.aliases/header_unordered_set_synop.pass.cpp
--- a/libcxx/test/std/experimental/memory/memory.resource.aliases/header_unordered_set_synop.pass.cpp
+++ b/libcxx/test/std/experimental/memory/memory.resource.aliases/header_unordered_set_synop.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/unordered_set>
 
diff --git a/libcxx/test/std/experimental/memory/memory.resource.aliases/header_vector_synop.pass.cpp b/libcxx/test/std/experimental/memory/memory.resource.aliases/header_vector_synop.pass.cpp
--- a/libcxx/test/std/experimental/memory/memory.resource.aliases/header_vector_synop.pass.cpp
+++ b/libcxx/test/std/experimental/memory/memory.resource.aliases/header_vector_synop.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/vector>
 
diff --git a/libcxx/test/std/experimental/memory/memory.resource.global/default_resource.pass.cpp b/libcxx/test/std/experimental/memory/memory.resource.global/default_resource.pass.cpp
--- a/libcxx/test/std/experimental/memory/memory.resource.global/default_resource.pass.cpp
+++ b/libcxx/test/std/experimental/memory/memory.resource.global/default_resource.pass.cpp
@@ -11,10 +11,7 @@
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/libcxx/test/std/experimental/memory/memory.resource.global/new_delete_resource.pass.cpp b/libcxx/test/std/experimental/memory/memory.resource.global/new_delete_resource.pass.cpp
--- a/libcxx/test/std/experimental/memory/memory.resource.global/new_delete_resource.pass.cpp
+++ b/libcxx/test/std/experimental/memory/memory.resource.global/new_delete_resource.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/libcxx/test/std/experimental/memory/memory.resource.global/null_memory_resource.pass.cpp b/libcxx/test/std/experimental/memory/memory.resource.global/null_memory_resource.pass.cpp
--- a/libcxx/test/std/experimental/memory/memory.resource.global/null_memory_resource.pass.cpp
+++ b/libcxx/test/std/experimental/memory/memory.resource.global/null_memory_resource.pass.cpp
@@ -8,10 +8,7 @@
 
 // UNSUPPORTED: c++03
 
-// Aligned allocation is required by std::experimental::pmr, but it was not provided
-// before macosx10.13 and as a result we get linker errors when deploying to older than
-// macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-aligned_allocation-missing
 
 // <experimental/memory_resource>
 
diff --git a/libcxx/test/std/input.output/file.streams/fstreams/filebuf.members/open_path.pass.cpp b/libcxx/test/std/input.output/file.streams/fstreams/filebuf.members/open_path.pass.cpp
--- a/libcxx/test/std/input.output/file.streams/fstreams/filebuf.members/open_path.pass.cpp
+++ b/libcxx/test/std/input.output/file.streams/fstreams/filebuf.members/open_path.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: c++03, c++11, c++14
 // UNSUPPORTED: no-filesystem
 
-// Filesystem is supported on Apple platforms starting with macosx10.15.
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// UNSUPPORTED: availability-filesystem-missing
 
 // <fstream>
 
diff --git a/libcxx/test/std/input.output/file.streams/fstreams/fstream.cons/path.pass.cpp b/libcxx/test/std/input.output/file.streams/fstreams/fstream.cons/path.pass.cpp
--- a/libcxx/test/std/input.output/file.streams/fstreams/fstream.cons/path.pass.cpp
+++ b/libcxx/test/std/input.output/file.streams/fstreams/fstream.cons/path.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: c++03, c++11, c++14
 // UNSUPPORTED: no-filesystem
 
-// Filesystem is supported on Apple platforms starting with macosx10.15.
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// UNSUPPORTED: availability-filesystem-missing
 
 // <fstream>
 
diff --git a/libcxx/test/std/input.output/file.streams/fstreams/fstream.members/open_path.pass.cpp b/libcxx/test/std/input.output/file.streams/fstreams/fstream.members/open_path.pass.cpp
--- a/libcxx/test/std/input.output/file.streams/fstreams/fstream.members/open_path.pass.cpp
+++ b/libcxx/test/std/input.output/file.streams/fstreams/fstream.members/open_path.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: c++03, c++11, c++14
 // UNSUPPORTED: no-filesystem
 
-// Filesystem is supported on Apple platforms starting with macosx10.15.
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// UNSUPPORTED: availability-filesystem-missing
 
 // <fstream>
 
diff --git a/libcxx/test/std/input.output/file.streams/fstreams/ifstream.cons/path.pass.cpp b/libcxx/test/std/input.output/file.streams/fstreams/ifstream.cons/path.pass.cpp
--- a/libcxx/test/std/input.output/file.streams/fstreams/ifstream.cons/path.pass.cpp
+++ b/libcxx/test/std/input.output/file.streams/fstreams/ifstream.cons/path.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: c++03, c++11, c++14
 // UNSUPPORTED: no-filesystem
 
-// Filesystem is supported on Apple platforms starting with macosx10.15.
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// UNSUPPORTED: availability-filesystem-missing
 
 // FILE_DEPENDENCIES: test.dat
 
diff --git a/libcxx/test/std/input.output/file.streams/fstreams/ifstream.members/open_path.pass.cpp b/libcxx/test/std/input.output/file.streams/fstreams/ifstream.members/open_path.pass.cpp
--- a/libcxx/test/std/input.output/file.streams/fstreams/ifstream.members/open_path.pass.cpp
+++ b/libcxx/test/std/input.output/file.streams/fstreams/ifstream.members/open_path.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: c++03, c++11, c++14
 // UNSUPPORTED: no-filesystem
 
-// Filesystem is supported on Apple platforms starting with macosx10.15.
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// UNSUPPORTED: availability-filesystem-missing
 
 // FILE_DEPENDENCIES: test.dat
 
diff --git a/libcxx/test/std/input.output/file.streams/fstreams/ofstream.cons/path.pass.cpp b/libcxx/test/std/input.output/file.streams/fstreams/ofstream.cons/path.pass.cpp
--- a/libcxx/test/std/input.output/file.streams/fstreams/ofstream.cons/path.pass.cpp
+++ b/libcxx/test/std/input.output/file.streams/fstreams/ofstream.cons/path.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: c++03, c++11, c++14
 // UNSUPPORTED: no-filesystem
 
-// Filesystem is supported on Apple platforms starting with macosx10.15.
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// UNSUPPORTED: availability-filesystem-missing
 
 // <fstream>
 
diff --git a/libcxx/test/std/input.output/file.streams/fstreams/ofstream.members/open_path.pass.cpp b/libcxx/test/std/input.output/file.streams/fstreams/ofstream.members/open_path.pass.cpp
--- a/libcxx/test/std/input.output/file.streams/fstreams/ofstream.members/open_path.pass.cpp
+++ b/libcxx/test/std/input.output/file.streams/fstreams/ofstream.members/open_path.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: c++03, c++11, c++14
 // UNSUPPORTED: no-filesystem
 
-// Filesystem is supported on Apple platforms starting with macosx10.15.
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// UNSUPPORTED: availability-filesystem-missing
 
 // <fstream>
 
diff --git a/libcxx/test/std/input.output/filesystems/lit.local.cfg b/libcxx/test/std/input.output/filesystems/lit.local.cfg
--- a/libcxx/test/std/input.output/filesystems/lit.local.cfg
+++ b/libcxx/test/std/input.output/filesystems/lit.local.cfg
@@ -1,10 +1,5 @@
-# Filesystem is supported on Apple platforms starting with macosx10.15.
-# Automatically disable the <filesystem> tests when we're running the test
-# suite against an older macOS.
-too_old = {'10.9', '10.10', '10.11', '10.12', '10.13', '10.14'}
-if 'use_system_cxx_lib' in config.available_features:
-  if any('target=x86_64-apple-macosx{}'.format(v) in config.available_features for v in too_old):
-    config.unsupported = True
+if 'availability-filesystem-missing' in config.available_features:
+  config.unsupported = True
 
 if 'no-filesystem' in config.available_features:
     config.unsupported = True
diff --git a/libcxx/test/std/iterators/iterator.primitives/iterator.traits/cxx20_iterator_traits.compile.pass.cpp b/libcxx/test/std/iterators/iterator.primitives/iterator.traits/cxx20_iterator_traits.compile.pass.cpp
--- a/libcxx/test/std/iterators/iterator.primitives/iterator.traits/cxx20_iterator_traits.compile.pass.cpp
+++ b/libcxx/test/std/iterators/iterator.primitives/iterator.traits/cxx20_iterator_traits.compile.pass.cpp
@@ -8,8 +8,8 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test uses iterator types from std::filesystem, which were introduced in macOS 10.15.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// This test uses iterator types from std::filesystem
+// XFAIL: availability-filesystem-missing
 
 // template<class T>
 // struct iterator_traits;
diff --git a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t.pass.cpp b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t.pass.cpp
--- a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t.pass.cpp
+++ b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t.pass.cpp
@@ -11,9 +11,8 @@
 // asan and msan will not call the new handler.
 // UNSUPPORTED: sanitizer-new-delete
 
-// Aligned allocation was not provided before macosx10.13 and as a result we
-// get availability errors when the deployment target is older than macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// We get availability markup errors when aligned allocation is missing
+// XFAIL: availability-aligned_allocation-missing
 
 // Libcxx when built for z/OS doesn't contain the aligned allocation functions,
 // nor does the dynamic library shipped with z/OS.
diff --git a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t_nothrow.pass.cpp b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t_nothrow.pass.cpp
--- a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t_nothrow.pass.cpp
+++ b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t_nothrow.pass.cpp
@@ -11,9 +11,8 @@
 // asan and msan will not call the new handler.
 // UNSUPPORTED: sanitizer-new-delete
 
-// Aligned allocation was not provided before macosx10.13 and as a result we
-// get availability errors when the deployment target is older than macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// We get availability markup errors when aligned allocation is missing
+// XFAIL: availability-aligned_allocation-missing
 
 // Libcxx when built for z/OS doesn't contain the aligned allocation functions,
 // nor does the dynamic library shipped with z/OS.
diff --git a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t_nothrow_replace.pass.cpp b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t_nothrow_replace.pass.cpp
--- a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t_nothrow_replace.pass.cpp
+++ b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t_nothrow_replace.pass.cpp
@@ -11,9 +11,8 @@
 
 // XFAIL: LIBCXX-AIX-FIXME
 
-// Aligned allocation was not provided before macosx10.13 and as a result we
-// get availability errors when the deployment target is older than macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// We get availability markup errors when aligned allocation is missing
+// XFAIL: availability-aligned_allocation-missing
 
 // Libcxx when built for z/OS doesn't contain the aligned allocation functions,
 // nor does the dynamic library shipped with z/OS.
diff --git a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t.pass.cpp b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t.pass.cpp
--- a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t.pass.cpp
+++ b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t.pass.cpp
@@ -8,9 +8,8 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Aligned allocation was not provided before macosx10.13 and as a result we
-// get availability errors when the deployment target is older than macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// We get availability markup errors when aligned allocation is missing
+// XFAIL: availability-aligned_allocation-missing
 
 // asan and msan will not call the new handler.
 // UNSUPPORTED: sanitizer-new-delete
diff --git a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t_nothrow.pass.cpp b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t_nothrow.pass.cpp
--- a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t_nothrow.pass.cpp
+++ b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t_nothrow.pass.cpp
@@ -8,9 +8,8 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Aligned allocation was not provided before macosx10.13 and as a result we
-// get availability errors when the deployment target is older than macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// We get availability markup errors when aligned allocation is missing
+// XFAIL: availability-aligned_allocation-missing
 
 // asan and msan will not call the new handler.
 // UNSUPPORTED: sanitizer-new-delete
diff --git a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t_nothrow_replace.pass.cpp b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t_nothrow_replace.pass.cpp
--- a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t_nothrow_replace.pass.cpp
+++ b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t_nothrow_replace.pass.cpp
@@ -11,9 +11,8 @@
 
 // XFAIL: LIBCXX-AIX-FIXME
 
-// Aligned allocation was not provided before macosx10.13 and as a result we
-// get availability errors when the deployment target is older than macosx10.13.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// We get availability markup errors when aligned allocation is missing
+// XFAIL: availability-aligned_allocation-missing
 
 // Libcxx when built for z/OS doesn't contain the aligned allocation functions,
 // nor does the dynamic library shipped with z/OS.
diff --git a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_char16_t_char8_t.pass.cpp b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_char16_t_char8_t.pass.cpp
--- a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_char16_t_char8_t.pass.cpp
+++ b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_char16_t_char8_t.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_char32_t_char8_t.pass.cpp b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_char32_t_char8_t.pass.cpp
--- a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_char32_t_char8_t.pass.cpp
+++ b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_char32_t_char8_t.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/ctor_char16_t_char8_t.pass.cpp b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/ctor_char16_t_char8_t.pass.cpp
--- a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/ctor_char16_t_char8_t.pass.cpp
+++ b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/ctor_char16_t_char8_t.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/ctor_char32_t_char8_t.pass.cpp b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/ctor_char32_t_char8_t.pass.cpp
--- a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/ctor_char32_t_char8_t.pass.cpp
+++ b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/ctor_char32_t_char8_t.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_always_noconv.pass.cpp b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_always_noconv.pass.cpp
--- a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_always_noconv.pass.cpp
+++ b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_always_noconv.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_encoding.pass.cpp b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_encoding.pass.cpp
--- a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_encoding.pass.cpp
+++ b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_encoding.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_in.pass.cpp b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_in.pass.cpp
--- a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_in.pass.cpp
+++ b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_in.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_length.pass.cpp b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_length.pass.cpp
--- a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_length.pass.cpp
+++ b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_length.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_max_length.pass.cpp b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_max_length.pass.cpp
--- a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_max_length.pass.cpp
+++ b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_max_length.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_out.pass.cpp b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_out.pass.cpp
--- a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_out.pass.cpp
+++ b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_out.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_unshift.pass.cpp b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_unshift.pass.cpp
--- a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_unshift.pass.cpp
+++ b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_char8_t_unshift.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_always_noconv.pass.cpp b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_always_noconv.pass.cpp
--- a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_always_noconv.pass.cpp
+++ b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_always_noconv.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_encoding.pass.cpp b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_encoding.pass.cpp
--- a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_encoding.pass.cpp
+++ b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_encoding.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_in.pass.cpp b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_in.pass.cpp
--- a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_in.pass.cpp
+++ b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_in.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_length.pass.cpp b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_length.pass.cpp
--- a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_length.pass.cpp
+++ b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_length.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_max_length.pass.cpp b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_max_length.pass.cpp
--- a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_max_length.pass.cpp
+++ b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_max_length.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_out.pass.cpp b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_out.pass.cpp
--- a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_out.pass.cpp
+++ b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_out.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_unshift.pass.cpp b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_unshift.pass.cpp
--- a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_unshift.pass.cpp
+++ b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_char8_t_unshift.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/utf_sanity_check.pass.cpp b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/utf_sanity_check.pass.cpp
--- a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/utf_sanity_check.pass.cpp
+++ b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/utf_sanity_check.pass.cpp
@@ -6,9 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // This test runs in C++20, but we have deprecated codecvt<char(16|32), char, mbstate_t> in C++20.
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
diff --git a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/types_char16_t_char8_t.pass.cpp b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/types_char16_t_char8_t.pass.cpp
--- a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/types_char16_t_char8_t.pass.cpp
+++ b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/types_char16_t_char8_t.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/types_char32_t_char8_t.pass.cpp b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/types_char32_t_char8_t.pass.cpp
--- a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/types_char32_t_char8_t.pass.cpp
+++ b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/types_char32_t_char8_t.pass.cpp
@@ -8,9 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // <locale>
 
diff --git a/libcxx/test/std/localization/locales/locale/locale.cons/assign.pass.cpp b/libcxx/test/std/localization/locales/locale/locale.cons/assign.pass.cpp
--- a/libcxx/test/std/localization/locales/locale/locale.cons/assign.pass.cpp
+++ b/libcxx/test/std/localization/locales/locale/locale.cons/assign.pass.cpp
@@ -8,9 +8,7 @@
 
 // REQUIRES: locale.ru_RU.UTF-8
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // This test runs in C++20, but we have deprecated codecvt<char(16|32), char, mbstate_t> in C++20.
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
diff --git a/libcxx/test/std/localization/locales/locale/locale.cons/char_pointer.pass.cpp b/libcxx/test/std/localization/locales/locale/locale.cons/char_pointer.pass.cpp
--- a/libcxx/test/std/localization/locales/locale/locale.cons/char_pointer.pass.cpp
+++ b/libcxx/test/std/localization/locales/locale/locale.cons/char_pointer.pass.cpp
@@ -12,9 +12,7 @@
 // REQUIRES: locale.ru_RU.UTF-8
 // REQUIRES: locale.zh_CN.UTF-8
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // This test runs in C++20, but we have deprecated codecvt<char(16|32), char, mbstate_t> in C++20.
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
diff --git a/libcxx/test/std/localization/locales/locale/locale.cons/copy.pass.cpp b/libcxx/test/std/localization/locales/locale/locale.cons/copy.pass.cpp
--- a/libcxx/test/std/localization/locales/locale/locale.cons/copy.pass.cpp
+++ b/libcxx/test/std/localization/locales/locale/locale.cons/copy.pass.cpp
@@ -8,9 +8,7 @@
 
 // REQUIRES: locale.fr_FR.UTF-8
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // This test runs in C++20, but we have deprecated codecvt<char(16|32), char, mbstate_t> in C++20.
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
diff --git a/libcxx/test/std/localization/locales/locale/locale.cons/default.pass.cpp b/libcxx/test/std/localization/locales/locale/locale.cons/default.pass.cpp
--- a/libcxx/test/std/localization/locales/locale/locale.cons/default.pass.cpp
+++ b/libcxx/test/std/localization/locales/locale/locale.cons/default.pass.cpp
@@ -8,9 +8,7 @@
 
 // REQUIRES: locale.en_US.UTF-8
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // This test runs in C++20, but we have deprecated codecvt<char(16|32), char, mbstate_t> in C++20.
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
diff --git a/libcxx/test/std/localization/locales/locale/locale.cons/locale_char_pointer_cat.pass.cpp b/libcxx/test/std/localization/locales/locale/locale.cons/locale_char_pointer_cat.pass.cpp
--- a/libcxx/test/std/localization/locales/locale/locale.cons/locale_char_pointer_cat.pass.cpp
+++ b/libcxx/test/std/localization/locales/locale/locale.cons/locale_char_pointer_cat.pass.cpp
@@ -10,9 +10,7 @@
 // REQUIRES: locale.ru_RU.UTF-8
 // UNSUPPORTED: sanitizer-new-delete
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // This test runs in C++20, but we have deprecated codecvt<char(16|32), char, mbstate_t> in C++20.
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
diff --git a/libcxx/test/std/localization/locales/locale/locale.cons/locale_facetptr.pass.cpp b/libcxx/test/std/localization/locales/locale/locale.cons/locale_facetptr.pass.cpp
--- a/libcxx/test/std/localization/locales/locale/locale.cons/locale_facetptr.pass.cpp
+++ b/libcxx/test/std/localization/locales/locale/locale.cons/locale_facetptr.pass.cpp
@@ -8,9 +8,7 @@
 
 // REQUIRES: locale.ru_RU.UTF-8
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // This test runs in C++20, but we have deprecated codecvt<char(16|32), char, mbstate_t> in C++20.
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
diff --git a/libcxx/test/std/localization/locales/locale/locale.cons/locale_locale_cat.pass.cpp b/libcxx/test/std/localization/locales/locale/locale.cons/locale_locale_cat.pass.cpp
--- a/libcxx/test/std/localization/locales/locale/locale.cons/locale_locale_cat.pass.cpp
+++ b/libcxx/test/std/localization/locales/locale/locale.cons/locale_locale_cat.pass.cpp
@@ -10,9 +10,7 @@
 // REQUIRES: locale.ru_RU.UTF-8
 // UNSUPPORTED: sanitizer-new-delete
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // This test runs in C++20, but we have deprecated codecvt<char(16|32), char, mbstate_t> in C++20.
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
diff --git a/libcxx/test/std/localization/locales/locale/locale.cons/locale_string_cat.pass.cpp b/libcxx/test/std/localization/locales/locale/locale.cons/locale_string_cat.pass.cpp
--- a/libcxx/test/std/localization/locales/locale/locale.cons/locale_string_cat.pass.cpp
+++ b/libcxx/test/std/localization/locales/locale/locale.cons/locale_string_cat.pass.cpp
@@ -10,9 +10,7 @@
 // REQUIRES: locale.ru_RU.UTF-8
 // UNSUPPORTED: sanitizer-new-delete
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // This test runs in C++20, but we have deprecated codecvt<char(16|32), char, mbstate_t> in C++20.
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
diff --git a/libcxx/test/std/localization/locales/locale/locale.cons/string.pass.cpp b/libcxx/test/std/localization/locales/locale/locale.cons/string.pass.cpp
--- a/libcxx/test/std/localization/locales/locale/locale.cons/string.pass.cpp
+++ b/libcxx/test/std/localization/locales/locale/locale.cons/string.pass.cpp
@@ -9,9 +9,7 @@
 // REQUIRES: locale.ru_RU.UTF-8
 // REQUIRES: locale.zh_CN.UTF-8
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // This test runs in C++20, but we have deprecated codecvt<char(16|32), char, mbstate_t> in C++20.
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
diff --git a/libcxx/test/std/localization/locales/locale/locale.members/combine.pass.cpp b/libcxx/test/std/localization/locales/locale/locale.members/combine.pass.cpp
--- a/libcxx/test/std/localization/locales/locale/locale.members/combine.pass.cpp
+++ b/libcxx/test/std/localization/locales/locale/locale.members/combine.pass.cpp
@@ -6,9 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // This test runs in C++20, but we have deprecated codecvt<char(16|32), char, mbstate_t> in C++20.
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
diff --git a/libcxx/test/std/localization/locales/locale/locale.statics/classic.pass.cpp b/libcxx/test/std/localization/locales/locale/locale.statics/classic.pass.cpp
--- a/libcxx/test/std/localization/locales/locale/locale.statics/classic.pass.cpp
+++ b/libcxx/test/std/localization/locales/locale/locale.statics/classic.pass.cpp
@@ -6,9 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // This test runs in C++20, but we have deprecated codecvt<char(16|32), char, mbstate_t> in C++20.
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
diff --git a/libcxx/test/std/localization/locales/locale/locale.statics/global.pass.cpp b/libcxx/test/std/localization/locales/locale/locale.statics/global.pass.cpp
--- a/libcxx/test/std/localization/locales/locale/locale.statics/global.pass.cpp
+++ b/libcxx/test/std/localization/locales/locale/locale.statics/global.pass.cpp
@@ -8,9 +8,7 @@
 
 // REQUIRES: locale.en_US.UTF-8
 
-// This test relies on https://wg21.link/P0482 being implemented, which isn't in
-// older Apple dylibs
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-char8_t_support-missing
 
 // This test runs in C++20, but we have deprecated codecvt<char(16|32), char, mbstate_t> in C++20.
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
diff --git a/libcxx/test/std/numerics/rand/rand.device/ctor.pass.cpp b/libcxx/test/std/numerics/rand/rand.device/ctor.pass.cpp
--- a/libcxx/test/std/numerics/rand/rand.device/ctor.pass.cpp
+++ b/libcxx/test/std/numerics/rand/rand.device/ctor.pass.cpp
@@ -11,8 +11,7 @@
 
 // The behavior of std::random_device changed on Apple platforms with
 // https://llvm.org/D116045.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
 
 // UNSUPPORTED: no-random-device
 
diff --git a/libcxx/test/std/thread/thread.barrier/arrive.pass.cpp b/libcxx/test/std/thread/thread.barrier/arrive.pass.cpp
--- a/libcxx/test/std/thread/thread.barrier/arrive.pass.cpp
+++ b/libcxx/test/std/thread/thread.barrier/arrive.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <barrier>
 
diff --git a/libcxx/test/std/thread/thread.barrier/arrive_and_drop.pass.cpp b/libcxx/test/std/thread/thread.barrier/arrive_and_drop.pass.cpp
--- a/libcxx/test/std/thread/thread.barrier/arrive_and_drop.pass.cpp
+++ b/libcxx/test/std/thread/thread.barrier/arrive_and_drop.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <barrier>
 
diff --git a/libcxx/test/std/thread/thread.barrier/arrive_and_wait.pass.cpp b/libcxx/test/std/thread/thread.barrier/arrive_and_wait.pass.cpp
--- a/libcxx/test/std/thread/thread.barrier/arrive_and_wait.pass.cpp
+++ b/libcxx/test/std/thread/thread.barrier/arrive_and_wait.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <barrier>
 
diff --git a/libcxx/test/std/thread/thread.barrier/completion.pass.cpp b/libcxx/test/std/thread/thread.barrier/completion.pass.cpp
--- a/libcxx/test/std/thread/thread.barrier/completion.pass.cpp
+++ b/libcxx/test/std/thread/thread.barrier/completion.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <barrier>
 
diff --git a/libcxx/test/std/thread/thread.latch/arrive_and_wait.pass.cpp b/libcxx/test/std/thread/thread.latch/arrive_and_wait.pass.cpp
--- a/libcxx/test/std/thread/thread.latch/arrive_and_wait.pass.cpp
+++ b/libcxx/test/std/thread/thread.latch/arrive_and_wait.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <latch>
 
diff --git a/libcxx/test/std/thread/thread.latch/count_down.pass.cpp b/libcxx/test/std/thread/thread.latch/count_down.pass.cpp
--- a/libcxx/test/std/thread/thread.latch/count_down.pass.cpp
+++ b/libcxx/test/std/thread/thread.latch/count_down.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <latch>
 
diff --git a/libcxx/test/std/thread/thread.latch/try_wait.pass.cpp b/libcxx/test/std/thread/thread.latch/try_wait.pass.cpp
--- a/libcxx/test/std/thread/thread.latch/try_wait.pass.cpp
+++ b/libcxx/test/std/thread/thread.latch/try_wait.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <latch>
 
diff --git a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/implicit_ctad.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/implicit_ctad.pass.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/implicit_ctad.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/implicit_ctad.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// dylib support for shared_mutex was added in macosx10.12
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/default.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/default.pass.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/default.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/default.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// dylib support for shared_mutex was added in macosx10.12
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/move_assign.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/move_assign.pass.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/move_assign.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/move_assign.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// dylib support for shared_mutex was added in macosx10.12
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/move_ctor.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/move_ctor.pass.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/move_ctor.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/move_ctor.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// dylib support for shared_mutex was added in macosx10.12
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex.pass.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex.pass.cpp
@@ -10,8 +10,7 @@
 // UNSUPPORTED: c++03, c++11
 // ALLOW_RETRIES: 2
 
-// dylib support for shared_mutex was added in macosx10.12
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_adopt_lock.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_adopt_lock.pass.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_adopt_lock.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_adopt_lock.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// dylib support for shared_mutex was added in macosx10.12
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_defer_lock.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_defer_lock.pass.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_defer_lock.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_defer_lock.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// dylib support for shared_mutex was added in macosx10.12
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_duration.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_duration.pass.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_duration.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_duration.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// dylib support for shared_mutex was added in macosx10.12
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_time_point.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_time_point.pass.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_time_point.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_time_point.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// dylib support for shared_mutex was added in macosx10.12
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_try_to_lock.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_try_to_lock.pass.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_try_to_lock.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_try_to_lock.pass.cpp
@@ -10,8 +10,7 @@
 // UNSUPPORTED: c++03, c++11
 // ALLOW_RETRIES: 2
 
-// dylib support for shared_mutex was added in macosx10.12
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/lock.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/lock.pass.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/lock.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/lock.pass.cpp
@@ -10,8 +10,7 @@
 // UNSUPPORTED: c++03, c++11
 // ALLOW_RETRIES: 2
 
-// dylib support for shared_mutex was added in macosx10.12
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.obs/mutex.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.obs/mutex.pass.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.obs/mutex.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.obs/mutex.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// dylib support for shared_mutex was added in macosx10.12
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.obs/owns_lock.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.obs/owns_lock.pass.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.obs/owns_lock.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.obs/owns_lock.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// dylib support for shared_mutex was added in macosx10.12
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// XFAIL: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/assign.fail.cpp b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/assign.fail.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/assign.fail.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/assign.fail.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11, c++14
 
-// shared_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/copy.fail.cpp b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/copy.fail.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/copy.fail.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/copy.fail.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11, c++14
 
-// shared_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/default.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/default.pass.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/default.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/default.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11, c++14
 
-// shared_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/lock.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/lock.pass.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/lock.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/lock.pass.cpp
@@ -11,8 +11,7 @@
 
 // ALLOW_RETRIES: 2
 
-// shared_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/lock_shared.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/lock_shared.pass.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/lock_shared.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/lock_shared.pass.cpp
@@ -11,8 +11,7 @@
 
 // ALLOW_RETRIES: 2
 
-// shared_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/try_lock.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/try_lock.pass.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/try_lock.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/try_lock.pass.cpp
@@ -11,8 +11,7 @@
 
 // ALLOW_RETRIES: 2
 
-// shared_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/try_lock_shared.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/try_lock_shared.pass.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/try_lock_shared.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/try_lock_shared.pass.cpp
@@ -11,8 +11,7 @@
 
 // ALLOW_RETRIES: 2
 
-// shared_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/assign.compile.fail.cpp b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/assign.compile.fail.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/assign.compile.fail.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/assign.compile.fail.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11
 
-// shared_timed_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/copy.compile.fail.cpp b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/copy.compile.fail.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/copy.compile.fail.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/copy.compile.fail.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11
 
-// shared_timed_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/default.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/default.pass.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/default.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/default.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// shared_timed_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/lock.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/lock.pass.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/lock.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/lock.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// shared_timed_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // ALLOW_RETRIES: 3
 
diff --git a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/lock_shared.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/lock_shared.pass.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/lock_shared.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/lock_shared.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// shared_timed_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // ALLOW_RETRIES: 3
 
diff --git a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock.pass.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock.pass.cpp
@@ -11,8 +11,7 @@
 
 // ALLOW_RETRIES: 2
 
-// shared_timed_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_for.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_for.pass.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_for.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_for.pass.cpp
@@ -10,8 +10,7 @@
 // UNSUPPORTED: c++03, c++11
 // ALLOW_RETRIES: 2
 
-// shared_timed_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared.pass.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared.pass.cpp
@@ -11,8 +11,7 @@
 
 // ALLOW_RETRIES: 2
 
-// shared_timed_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared_for.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared_for.pass.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared_for.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared_for.pass.cpp
@@ -11,8 +11,7 @@
 
 // ALLOW_RETRIES: 3
 
-// shared_timed_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared_until.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared_until.pass.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared_until.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared_until.pass.cpp
@@ -11,8 +11,7 @@
 
 // ALLOW_RETRIES: 2
 
-// shared_timed_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_until.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_until.pass.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_until.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_until.pass.cpp
@@ -11,8 +11,7 @@
 
 // ALLOW_RETRIES: 2
 
-// shared_timed_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_until_deadlock_bug.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_until_deadlock_bug.pass.cpp
--- a/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_until_deadlock_bug.pass.cpp
+++ b/libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_until_deadlock_bug.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// shared_timed_mutex was introduced in macosx10.12
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
+// UNSUPPORTED: availability-shared_mutex-missing
 
 // <shared_mutex>
 
diff --git a/libcxx/test/std/thread/thread.semaphore/acquire.pass.cpp b/libcxx/test/std/thread/thread.semaphore/acquire.pass.cpp
--- a/libcxx/test/std/thread/thread.semaphore/acquire.pass.cpp
+++ b/libcxx/test/std/thread/thread.semaphore/acquire.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <semaphore>
 
diff --git a/libcxx/test/std/thread/thread.semaphore/binary.pass.cpp b/libcxx/test/std/thread/thread.semaphore/binary.pass.cpp
--- a/libcxx/test/std/thread/thread.semaphore/binary.pass.cpp
+++ b/libcxx/test/std/thread/thread.semaphore/binary.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <semaphore>
 
diff --git a/libcxx/test/std/thread/thread.semaphore/release.pass.cpp b/libcxx/test/std/thread/thread.semaphore/release.pass.cpp
--- a/libcxx/test/std/thread/thread.semaphore/release.pass.cpp
+++ b/libcxx/test/std/thread/thread.semaphore/release.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <semaphore>
 
diff --git a/libcxx/test/std/thread/thread.semaphore/timed.pass.cpp b/libcxx/test/std/thread/thread.semaphore/timed.pass.cpp
--- a/libcxx/test/std/thread/thread.semaphore/timed.pass.cpp
+++ b/libcxx/test/std/thread/thread.semaphore/timed.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <semaphore>
 
diff --git a/libcxx/test/std/thread/thread.semaphore/try_acquire.pass.cpp b/libcxx/test/std/thread/thread.semaphore/try_acquire.pass.cpp
--- a/libcxx/test/std/thread/thread.semaphore/try_acquire.pass.cpp
+++ b/libcxx/test/std/thread/thread.semaphore/try_acquire.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: no-threads
 // UNSUPPORTED: c++03, c++11
 
-// This test requires the dylib support introduced in D68480, which shipped in macOS 11.0.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
+// XFAIL: availability-synchronization_library-missing
 
 // <semaphore>
 
diff --git a/libcxx/test/std/time/time.hms/time.hms.nonmembers/ostream.pass.cpp b/libcxx/test/std/time/time.hms/time.hms.nonmembers/ostream.pass.cpp
--- a/libcxx/test/std/time/time.hms/time.hms.nonmembers/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.hms/time.hms.nonmembers/ostream.pass.cpp
@@ -16,8 +16,7 @@
 // TODO FMT Investigate Windows issues.
 // UNSUPPORTED: msvc, target={{.+}}-windows-gnu
 
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/time/time.cal/time.cal.day/time.cal.day.nonmembers/ostream.pass.cpp b/libcxx/test/std/time/time.cal/time.cal.day/time.cal.day.nonmembers/ostream.pass.cpp
--- a/libcxx/test/std/time/time.cal/time.cal.day/time.cal.day.nonmembers/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.cal/time.cal.day/time.cal.day.nonmembers/ostream.pass.cpp
@@ -16,8 +16,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/time/time.cal/time.cal.md/time.cal.md.nonmembers/ostream.pass.cpp b/libcxx/test/std/time/time.cal/time.cal.md/time.cal.md.nonmembers/ostream.pass.cpp
--- a/libcxx/test/std/time/time.cal/time.cal.md/time.cal.md.nonmembers/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.cal/time.cal.md/time.cal.md.nonmembers/ostream.pass.cpp
@@ -17,8 +17,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/time/time.cal/time.cal.mdlast/ostream.pass.cpp b/libcxx/test/std/time/time.cal/time.cal.mdlast/ostream.pass.cpp
--- a/libcxx/test/std/time/time.cal/time.cal.mdlast/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.cal/time.cal.mdlast/ostream.pass.cpp
@@ -19,8 +19,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/time/time.cal/time.cal.month/time.cal.month.nonmembers/ostream.pass.cpp b/libcxx/test/std/time/time.cal/time.cal.month/time.cal.month.nonmembers/ostream.pass.cpp
--- a/libcxx/test/std/time/time.cal/time.cal.month/time.cal.month.nonmembers/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.cal/time.cal.month/time.cal.month.nonmembers/ostream.pass.cpp
@@ -16,8 +16,7 @@
 // UNSUPPORTED: msvc, target={{.+}}-windows-gnu
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/time/time.cal/time.cal.mwd/time.cal.mwd.nonmembers/ostream.pass.cpp b/libcxx/test/std/time/time.cal/time.cal.mwd/time.cal.mwd.nonmembers/ostream.pass.cpp
--- a/libcxx/test/std/time/time.cal/time.cal.mwd/time.cal.mwd.nonmembers/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.cal/time.cal.mwd/time.cal.mwd.nonmembers/ostream.pass.cpp
@@ -19,8 +19,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.nonmembers/ostream.pass.cpp b/libcxx/test/std/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.nonmembers/ostream.pass.cpp
--- a/libcxx/test/std/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.nonmembers/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.nonmembers/ostream.pass.cpp
@@ -19,8 +19,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/time/time.cal/time.cal.wdidx/time.cal.wdidx.nonmembers/ostream.pass.cpp b/libcxx/test/std/time/time.cal/time.cal.wdidx/time.cal.wdidx.nonmembers/ostream.pass.cpp
--- a/libcxx/test/std/time/time.cal/time.cal.wdidx/time.cal.wdidx.nonmembers/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.cal/time.cal.wdidx/time.cal.wdidx.nonmembers/ostream.pass.cpp
@@ -14,8 +14,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/time/time.cal/time.cal.wdlast/time.cal.wdlast.nonmembers/ostream.pass.cpp b/libcxx/test/std/time/time.cal/time.cal.wdlast/time.cal.wdlast.nonmembers/ostream.pass.cpp
--- a/libcxx/test/std/time/time.cal/time.cal.wdlast/time.cal.wdlast.nonmembers/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.cal/time.cal.wdlast/time.cal.wdlast.nonmembers/ostream.pass.cpp
@@ -14,8 +14,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/ostream.pass.cpp b/libcxx/test/std/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/ostream.pass.cpp
--- a/libcxx/test/std/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/ostream.pass.cpp
@@ -11,8 +11,7 @@
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/time/time.cal/time.cal.year/time.cal.year.nonmembers/ostream.pass.cpp b/libcxx/test/std/time/time.cal/time.cal.year/time.cal.year.nonmembers/ostream.pass.cpp
--- a/libcxx/test/std/time/time.cal/time.cal.year/time.cal.year.nonmembers/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.cal/time.cal.year/time.cal.year.nonmembers/ostream.pass.cpp
@@ -14,8 +14,7 @@
 // UNSUPPORTED: msvc, target={{.+}}-windows-gnu
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/time/time.cal/time.cal.ym/time.cal.ym.nonmembers/ostream.pass.cpp b/libcxx/test/std/time/time.cal/time.cal.ym/time.cal.ym.nonmembers/ostream.pass.cpp
--- a/libcxx/test/std/time/time.cal/time.cal.ym/time.cal.ym.nonmembers/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.cal/time.cal.ym/time.cal.ym.nonmembers/ostream.pass.cpp
@@ -19,8 +19,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/time/time.cal/time.cal.ymd/time.cal.ymd.nonmembers/ostream.pass.cpp b/libcxx/test/std/time/time.cal/time.cal.ymd/time.cal.ymd.nonmembers/ostream.pass.cpp
--- a/libcxx/test/std/time/time.cal/time.cal.ymd/time.cal.ymd.nonmembers/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.cal/time.cal.ymd/time.cal.ymd.nonmembers/ostream.pass.cpp
@@ -17,8 +17,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.nonmembers/ostream.pass.cpp b/libcxx/test/std/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.nonmembers/ostream.pass.cpp
--- a/libcxx/test/std/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.nonmembers/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.nonmembers/ostream.pass.cpp
@@ -19,8 +19,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/time/time.cal/time.cal.ymwd/time.cal.ymwd.nonmembers/ostream.pass.cpp b/libcxx/test/std/time/time.cal/time.cal.ymwd/time.cal.ymwd.nonmembers/ostream.pass.cpp
--- a/libcxx/test/std/time/time.cal/time.cal.ymwd/time.cal.ymwd.nonmembers/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.cal/time.cal.ymwd/time.cal.ymwd.nonmembers/ostream.pass.cpp
@@ -17,8 +17,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.nonmembers/ostream.pass.cpp b/libcxx/test/std/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.nonmembers/ostream.pass.cpp
--- a/libcxx/test/std/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.nonmembers/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.nonmembers/ostream.pass.cpp
@@ -17,8 +17,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/time/time.clock/time.clock.file/now.pass.cpp b/libcxx/test/std/time/time.clock/time.clock.file/now.pass.cpp
--- a/libcxx/test/std/time/time.clock/time.clock.file/now.pass.cpp
+++ b/libcxx/test/std/time/time.clock/time.clock.file/now.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: no-filesystem
 
-// Filesystem is supported on Apple platforms starting with macosx10.15.
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// UNSUPPORTED: availability-filesystem-missing
 
 // <chrono>
 
diff --git a/libcxx/test/std/time/time.clock/time.clock.file/to_from_sys.pass.cpp b/libcxx/test/std/time/time.clock/time.clock.file/to_from_sys.pass.cpp
--- a/libcxx/test/std/time/time.clock/time.clock.file/to_from_sys.pass.cpp
+++ b/libcxx/test/std/time/time.clock/time.clock.file/to_from_sys.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: no-filesystem
 
-// Filesystem is supported on Apple platforms starting with macosx10.15.
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// UNSUPPORTED: availability-filesystem-missing
 
 // <chrono>
 //
diff --git a/libcxx/test/std/time/time.duration/time.duration.nonmember/ostream.pass.cpp b/libcxx/test/std/time/time.duration/time.duration.nonmember/ostream.pass.cpp
--- a/libcxx/test/std/time/time.duration/time.duration.nonmember/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.duration/time.duration.nonmember/ostream.pass.cpp
@@ -16,8 +16,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/time/time.syn/formatter.hh_mm_ss.pass.cpp b/libcxx/test/std/time/time.syn/formatter.hh_mm_ss.pass.cpp
--- a/libcxx/test/std/time/time.syn/formatter.hh_mm_ss.pass.cpp
+++ b/libcxx/test/std/time/time.syn/formatter.hh_mm_ss.pass.cpp
@@ -17,8 +17,7 @@
 
 // XFAIL: LIBCXX-FREEBSD-FIXME
 
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/time/time.syn/formatter.day.pass.cpp b/libcxx/test/std/time/time.syn/formatter.day.pass.cpp
--- a/libcxx/test/std/time/time.syn/formatter.day.pass.cpp
+++ b/libcxx/test/std/time/time.syn/formatter.day.pass.cpp
@@ -15,8 +15,7 @@
 // UNSUPPORTED: msvc, target={{.+}}-windows-gnu
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/time/time.syn/formatter.duration.pass.cpp b/libcxx/test/std/time/time.syn/formatter.duration.pass.cpp
--- a/libcxx/test/std/time/time.syn/formatter.duration.pass.cpp
+++ b/libcxx/test/std/time/time.syn/formatter.duration.pass.cpp
@@ -16,8 +16,7 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/time/time.syn/formatter.month.pass.cpp b/libcxx/test/std/time/time.syn/formatter.month.pass.cpp
--- a/libcxx/test/std/time/time.syn/formatter.month.pass.cpp
+++ b/libcxx/test/std/time/time.syn/formatter.month.pass.cpp
@@ -12,8 +12,7 @@
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/time/time.syn/formatter.month_day.pass.cpp b/libcxx/test/std/time/time.syn/formatter.month_day.pass.cpp
--- a/libcxx/test/std/time/time.syn/formatter.month_day.pass.cpp
+++ b/libcxx/test/std/time/time.syn/formatter.month_day.pass.cpp
@@ -18,8 +18,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/time/time.syn/formatter.month_day_last.pass.cpp b/libcxx/test/std/time/time.syn/formatter.month_day_last.pass.cpp
--- a/libcxx/test/std/time/time.syn/formatter.month_day_last.pass.cpp
+++ b/libcxx/test/std/time/time.syn/formatter.month_day_last.pass.cpp
@@ -15,8 +15,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/time/time.syn/formatter.month_weekday.pass.cpp b/libcxx/test/std/time/time.syn/formatter.month_weekday.pass.cpp
--- a/libcxx/test/std/time/time.syn/formatter.month_weekday.pass.cpp
+++ b/libcxx/test/std/time/time.syn/formatter.month_weekday.pass.cpp
@@ -15,8 +15,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/time/time.syn/formatter.weekday.pass.cpp b/libcxx/test/std/time/time.syn/formatter.weekday.pass.cpp
--- a/libcxx/test/std/time/time.syn/formatter.weekday.pass.cpp
+++ b/libcxx/test/std/time/time.syn/formatter.weekday.pass.cpp
@@ -15,8 +15,7 @@
 // UNSUPPORTED: msvc, target={{.+}}-windows-gnu
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/time/time.syn/formatter.weekday_index.pass.cpp b/libcxx/test/std/time/time.syn/formatter.weekday_index.pass.cpp
--- a/libcxx/test/std/time/time.syn/formatter.weekday_index.pass.cpp
+++ b/libcxx/test/std/time/time.syn/formatter.weekday_index.pass.cpp
@@ -18,8 +18,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/time/time.syn/formatter.weekday_last.pass.cpp b/libcxx/test/std/time/time.syn/formatter.weekday_last.pass.cpp
--- a/libcxx/test/std/time/time.syn/formatter.weekday_last.pass.cpp
+++ b/libcxx/test/std/time/time.syn/formatter.weekday_last.pass.cpp
@@ -18,8 +18,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/time/time.syn/formatter.year.pass.cpp b/libcxx/test/std/time/time.syn/formatter.year.pass.cpp
--- a/libcxx/test/std/time/time.syn/formatter.year.pass.cpp
+++ b/libcxx/test/std/time/time.syn/formatter.year.pass.cpp
@@ -15,8 +15,7 @@
 // UNSUPPORTED: msvc, target={{.+}}-windows-gnu
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/time/time.syn/formatter.year_month.pass.cpp b/libcxx/test/std/time/time.syn/formatter.year_month.pass.cpp
--- a/libcxx/test/std/time/time.syn/formatter.year_month.pass.cpp
+++ b/libcxx/test/std/time/time.syn/formatter.year_month.pass.cpp
@@ -15,8 +15,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/time/time.syn/formatter.year_month_day.pass.cpp b/libcxx/test/std/time/time.syn/formatter.year_month_day.pass.cpp
--- a/libcxx/test/std/time/time.syn/formatter.year_month_day.pass.cpp
+++ b/libcxx/test/std/time/time.syn/formatter.year_month_day.pass.cpp
@@ -18,8 +18,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/time/time.syn/formatter.year_month_day_last.pass.cpp b/libcxx/test/std/time/time.syn/formatter.year_month_day_last.pass.cpp
--- a/libcxx/test/std/time/time.syn/formatter.year_month_day_last.pass.cpp
+++ b/libcxx/test/std/time/time.syn/formatter.year_month_day_last.pass.cpp
@@ -15,8 +15,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/time/time.syn/formatter.year_month_weekday.pass.cpp b/libcxx/test/std/time/time.syn/formatter.year_month_weekday.pass.cpp
--- a/libcxx/test/std/time/time.syn/formatter.year_month_weekday.pass.cpp
+++ b/libcxx/test/std/time/time.syn/formatter.year_month_weekday.pass.cpp
@@ -15,8 +15,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/time/time.syn/formatter.year_month_weekday_last.pass.cpp b/libcxx/test/std/time/time.syn/formatter.year_month_weekday_last.pass.cpp
--- a/libcxx/test/std/time/time.syn/formatter.year_month_weekday_last.pass.cpp
+++ b/libcxx/test/std/time/time.syn/formatter.year_month_weekday_last.pass.cpp
@@ -13,8 +13,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
diff --git a/libcxx/test/std/utilities/any/any.class/any.assign/copy.pass.cpp b/libcxx/test/std/utilities/any/any.class/any.assign/copy.pass.cpp
--- a/libcxx/test/std/utilities/any/any.class/any.assign/copy.pass.cpp
+++ b/libcxx/test/std/utilities/any/any.class/any.assign/copy.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_any_cast-missing && !no-exceptions
 
 // <any>
 
diff --git a/libcxx/test/std/utilities/any/any.class/any.assign/move.pass.cpp b/libcxx/test/std/utilities/any/any.class/any.assign/move.pass.cpp
--- a/libcxx/test/std/utilities/any/any.class/any.assign/move.pass.cpp
+++ b/libcxx/test/std/utilities/any/any.class/any.assign/move.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_any_cast-missing && !no-exceptions
 
 // <any>
 
diff --git a/libcxx/test/std/utilities/any/any.class/any.assign/value.pass.cpp b/libcxx/test/std/utilities/any/any.class/any.assign/value.pass.cpp
--- a/libcxx/test/std/utilities/any/any.class/any.assign/value.pass.cpp
+++ b/libcxx/test/std/utilities/any/any.class/any.assign/value.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_any_cast-missing && !no-exceptions
 
 // <any>
 
diff --git a/libcxx/test/std/utilities/any/any.class/any.cons/copy.pass.cpp b/libcxx/test/std/utilities/any/any.class/any.cons/copy.pass.cpp
--- a/libcxx/test/std/utilities/any/any.class/any.cons/copy.pass.cpp
+++ b/libcxx/test/std/utilities/any/any.class/any.cons/copy.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_any_cast-missing && !no-exceptions
 
 // <any>
 
diff --git a/libcxx/test/std/utilities/any/any.class/any.cons/in_place_type.pass.cpp b/libcxx/test/std/utilities/any/any.class/any.cons/in_place_type.pass.cpp
--- a/libcxx/test/std/utilities/any/any.class/any.cons/in_place_type.pass.cpp
+++ b/libcxx/test/std/utilities/any/any.class/any.cons/in_place_type.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_any_cast-missing && !no-exceptions
 
 // <any>
 
diff --git a/libcxx/test/std/utilities/any/any.class/any.cons/move.pass.cpp b/libcxx/test/std/utilities/any/any.class/any.cons/move.pass.cpp
--- a/libcxx/test/std/utilities/any/any.class/any.cons/move.pass.cpp
+++ b/libcxx/test/std/utilities/any/any.class/any.cons/move.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_any_cast-missing && !no-exceptions
 
 // <any>
 
diff --git a/libcxx/test/std/utilities/any/any.class/any.cons/value.pass.cpp b/libcxx/test/std/utilities/any/any.class/any.cons/value.pass.cpp
--- a/libcxx/test/std/utilities/any/any.class/any.cons/value.pass.cpp
+++ b/libcxx/test/std/utilities/any/any.class/any.cons/value.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_any_cast-missing && !no-exceptions
 
 // <any>
 
diff --git a/libcxx/test/std/utilities/any/any.class/any.modifiers/emplace.pass.cpp b/libcxx/test/std/utilities/any/any.class/any.modifiers/emplace.pass.cpp
--- a/libcxx/test/std/utilities/any/any.class/any.modifiers/emplace.pass.cpp
+++ b/libcxx/test/std/utilities/any/any.class/any.modifiers/emplace.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_any_cast-missing && !no-exceptions
 
 // <any>
 
diff --git a/libcxx/test/std/utilities/any/any.class/any.modifiers/reset.pass.cpp b/libcxx/test/std/utilities/any/any.class/any.modifiers/reset.pass.cpp
--- a/libcxx/test/std/utilities/any/any.class/any.modifiers/reset.pass.cpp
+++ b/libcxx/test/std/utilities/any/any.class/any.modifiers/reset.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_any_cast-missing && !no-exceptions
 
 // <any>
 
diff --git a/libcxx/test/std/utilities/any/any.class/any.modifiers/swap.pass.cpp b/libcxx/test/std/utilities/any/any.class/any.modifiers/swap.pass.cpp
--- a/libcxx/test/std/utilities/any/any.class/any.modifiers/swap.pass.cpp
+++ b/libcxx/test/std/utilities/any/any.class/any.modifiers/swap.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_any_cast-missing && !no-exceptions
 
 // <any>
 
diff --git a/libcxx/test/std/utilities/any/any.nonmembers/any.cast/any_cast_pointer.pass.cpp b/libcxx/test/std/utilities/any/any.nonmembers/any.cast/any_cast_pointer.pass.cpp
--- a/libcxx/test/std/utilities/any/any.nonmembers/any.cast/any_cast_pointer.pass.cpp
+++ b/libcxx/test/std/utilities/any/any.nonmembers/any.cast/any_cast_pointer.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_any_cast-missing && !no-exceptions
 
 // <any>
 
diff --git a/libcxx/test/std/utilities/any/any.nonmembers/any.cast/any_cast_reference.pass.cpp b/libcxx/test/std/utilities/any/any.nonmembers/any.cast/any_cast_reference.pass.cpp
--- a/libcxx/test/std/utilities/any/any.nonmembers/any.cast/any_cast_reference.pass.cpp
+++ b/libcxx/test/std/utilities/any/any.nonmembers/any.cast/any_cast_reference.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_any_cast-missing && !no-exceptions
 
 // <any>
 
diff --git a/libcxx/test/std/utilities/any/any.nonmembers/any.cast/any_cast_request_invalid_value_category.fail.cpp b/libcxx/test/std/utilities/any/any.nonmembers/any.cast/any_cast_request_invalid_value_category.fail.cpp
--- a/libcxx/test/std/utilities/any/any.nonmembers/any.cast/any_cast_request_invalid_value_category.fail.cpp
+++ b/libcxx/test/std/utilities/any/any.nonmembers/any.cast/any_cast_request_invalid_value_category.fail.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// UNSUPPORTED: availability-bad_any_cast-missing
 
 // <any>
 
diff --git a/libcxx/test/std/utilities/any/any.nonmembers/any.cast/const_correctness.verify.cpp b/libcxx/test/std/utilities/any/any.nonmembers/any.cast/const_correctness.verify.cpp
--- a/libcxx/test/std/utilities/any/any.nonmembers/any.cast/const_correctness.verify.cpp
+++ b/libcxx/test/std/utilities/any/any.nonmembers/any.cast/const_correctness.verify.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// UNSUPPORTED: availability-bad_any_cast-missing
 
 // <any>
 
diff --git a/libcxx/test/std/utilities/any/any.nonmembers/any.cast/not_copy_constructible.verify.cpp b/libcxx/test/std/utilities/any/any.nonmembers/any.cast/not_copy_constructible.verify.cpp
--- a/libcxx/test/std/utilities/any/any.nonmembers/any.cast/not_copy_constructible.verify.cpp
+++ b/libcxx/test/std/utilities/any/any.nonmembers/any.cast/not_copy_constructible.verify.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// UNSUPPORTED: availability-bad_any_cast-missing
 
 // <any>
 
diff --git a/libcxx/test/std/utilities/any/any.nonmembers/make_any.pass.cpp b/libcxx/test/std/utilities/any/any.nonmembers/make_any.pass.cpp
--- a/libcxx/test/std/utilities/any/any.nonmembers/make_any.pass.cpp
+++ b/libcxx/test/std/utilities/any/any.nonmembers/make_any.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_any_cast-missing && !no-exceptions
 
 // <any>
 
diff --git a/libcxx/test/std/utilities/any/any.nonmembers/swap.pass.cpp b/libcxx/test/std/utilities/any/any.nonmembers/swap.pass.cpp
--- a/libcxx/test/std/utilities/any/any.nonmembers/swap.pass.cpp
+++ b/libcxx/test/std/utilities/any/any.nonmembers/swap.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_any_cast is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_any_cast-missing && !no-exceptions
 
 // <any>
 
diff --git a/libcxx/test/std/utilities/charconv/charconv.msvc/test.pass.cpp b/libcxx/test/std/utilities/charconv/charconv.msvc/test.pass.cpp
--- a/libcxx/test/std/utilities/charconv/charconv.msvc/test.pass.cpp
+++ b/libcxx/test/std/utilities/charconv/charconv.msvc/test.pass.cpp
@@ -10,7 +10,7 @@
 
 // to_chars requires functions in the dylib that have not been introduced in older
 // versions of the dylib on macOS.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // steady_clock requires threads.
 // UNSUPPORTED: no-threads
diff --git a/libcxx/test/std/utilities/format/format.arguments/format.arg/visit_format_arg.pass.cpp b/libcxx/test/std/utilities/format/format.arguments/format.arg/visit_format_arg.pass.cpp
--- a/libcxx/test/std/utilities/format/format.arguments/format.arg/visit_format_arg.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.arguments/format.arg/visit_format_arg.pass.cpp
@@ -8,8 +8,7 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.arguments/format.args/get.pass.cpp b/libcxx/test/std/utilities/format/format.arguments/format.args/get.pass.cpp
--- a/libcxx/test/std/utilities/format/format.arguments/format.args/get.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.arguments/format.args/get.pass.cpp
@@ -8,8 +8,7 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.formattable/concept.formattable.compile.pass.cpp b/libcxx/test/std/utilities/format/format.formattable/concept.formattable.compile.pass.cpp
--- a/libcxx/test/std/utilities/format/format.formattable/concept.formattable.compile.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.formattable/concept.formattable.compile.pass.cpp
@@ -8,8 +8,8 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
-// This test uses std::filesystem::path, which was introduced in macOS 10.15
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// This test uses std::filesystem::path, which is not always available
+// XFAIL: availability-filesystem-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.formattable/concept.formattable.float.compile.pass.cpp b/libcxx/test/std/utilities/format/format.formattable/concept.formattable.float.compile.pass.cpp
--- a/libcxx/test/std/utilities/format/format.formattable/concept.formattable.float.compile.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.formattable/concept.formattable.float.compile.pass.cpp
@@ -8,8 +8,7 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.floating_point.pass.cpp b/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.floating_point.pass.cpp
--- a/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.floating_point.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.floating_point.pass.cpp
@@ -8,8 +8,7 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.functions/P2418.pass.cpp b/libcxx/test/std/utilities/format/format.functions/P2418.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/P2418.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/P2418.pass.cpp
@@ -11,8 +11,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // Tests whether a move only type can be formatted. This is required by
 // P2418R2 "Add support for std::generator-like types to std::format"
diff --git a/libcxx/test/std/utilities/format/format.functions/ascii.pass.cpp b/libcxx/test/std/utilities/format/format.functions/ascii.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/ascii.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/ascii.pass.cpp
@@ -12,8 +12,7 @@
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_HAS_NO_UNICODE
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.functions/escaped_output.ascii.pass.cpp b/libcxx/test/std/utilities/format/format.functions/escaped_output.ascii.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/escaped_output.ascii.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/escaped_output.ascii.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // Force unicode to be disabled.
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_HAS_NO_UNICODE
diff --git a/libcxx/test/std/utilities/format/format.functions/escaped_output.unicode.pass.cpp b/libcxx/test/std/utilities/format/format.functions/escaped_output.unicode.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/escaped_output.unicode.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/escaped_output.unicode.pass.cpp
@@ -16,8 +16,7 @@
 // UNSUPPORTED: LIBCXX-AIX-FIXME
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.functions/format.locale.pass.cpp b/libcxx/test/std/utilities/format/format.functions/format.locale.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/format.locale.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/format.locale.pass.cpp
@@ -11,8 +11,7 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED:gcc-12
 
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.functions/format.locale.verify.cpp b/libcxx/test/std/utilities/format/format.functions/format.locale.verify.cpp
--- a/libcxx/test/std/utilities/format/format.functions/format.locale.verify.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/format.locale.verify.cpp
@@ -10,8 +10,7 @@
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // Basic test to validate ill-formed code is properly detected.
 
diff --git a/libcxx/test/std/utilities/format/format.functions/format.pass.cpp b/libcxx/test/std/utilities/format/format.functions/format.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/format.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/format.pass.cpp
@@ -10,8 +10,7 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // Note this formatter shows additional information when tests are failing.
 // This aids the development. Since other formatters fail in the same fashion
diff --git a/libcxx/test/std/utilities/format/format.functions/format.verify.cpp b/libcxx/test/std/utilities/format/format.functions/format.verify.cpp
--- a/libcxx/test/std/utilities/format/format.functions/format.verify.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/format.verify.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // Basic test to validate ill-formed code is properly detected.
 
diff --git a/libcxx/test/std/utilities/format/format.functions/format_to.locale.pass.cpp b/libcxx/test/std/utilities/format/format.functions/format_to.locale.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/format_to.locale.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/format_to.locale.pass.cpp
@@ -11,8 +11,7 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.functions/format_to.locale.verify.cpp b/libcxx/test/std/utilities/format/format.functions/format_to.locale.verify.cpp
--- a/libcxx/test/std/utilities/format/format.functions/format_to.locale.verify.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/format_to.locale.verify.cpp
@@ -10,8 +10,7 @@
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // Basic test to validate ill-formed code is properly detected.
 
diff --git a/libcxx/test/std/utilities/format/format.functions/format_to.pass.cpp b/libcxx/test/std/utilities/format/format.functions/format_to.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/format_to.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/format_to.pass.cpp
@@ -10,8 +10,7 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.functions/format_to.verify.cpp b/libcxx/test/std/utilities/format/format.functions/format_to.verify.cpp
--- a/libcxx/test/std/utilities/format/format.functions/format_to.verify.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/format_to.verify.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.functions/format_to_n.locale.pass.cpp b/libcxx/test/std/utilities/format/format.functions/format_to_n.locale.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/format_to_n.locale.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/format_to_n.locale.pass.cpp
@@ -11,8 +11,7 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.functions/format_to_n.locale.verify.cpp b/libcxx/test/std/utilities/format/format.functions/format_to_n.locale.verify.cpp
--- a/libcxx/test/std/utilities/format/format.functions/format_to_n.locale.verify.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/format_to_n.locale.verify.cpp
@@ -10,8 +10,7 @@
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // Basic test to validate ill-formed code is properly detected.
 
diff --git a/libcxx/test/std/utilities/format/format.functions/format_to_n.pass.cpp b/libcxx/test/std/utilities/format/format.functions/format_to_n.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/format_to_n.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/format_to_n.pass.cpp
@@ -10,8 +10,7 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.functions/format_to_n.verify.cpp b/libcxx/test/std/utilities/format/format.functions/format_to_n.verify.cpp
--- a/libcxx/test/std/utilities/format/format.functions/format_to_n.verify.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/format_to_n.verify.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // Basic test to validate ill-formed code is properly detected.
 
diff --git a/libcxx/test/std/utilities/format/format.functions/formatted_size.locale.pass.cpp b/libcxx/test/std/utilities/format/format.functions/formatted_size.locale.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/formatted_size.locale.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/formatted_size.locale.pass.cpp
@@ -11,8 +11,7 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.functions/formatted_size.locale.verify.cpp b/libcxx/test/std/utilities/format/format.functions/formatted_size.locale.verify.cpp
--- a/libcxx/test/std/utilities/format/format.functions/formatted_size.locale.verify.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/formatted_size.locale.verify.cpp
@@ -10,8 +10,7 @@
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // Basic test to validate ill-formed code is properly detected.
 
diff --git a/libcxx/test/std/utilities/format/format.functions/formatted_size.pass.cpp b/libcxx/test/std/utilities/format/format.functions/formatted_size.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/formatted_size.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/formatted_size.pass.cpp
@@ -10,8 +10,7 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.functions/formatted_size.verify.cpp b/libcxx/test/std/utilities/format/format.functions/formatted_size.verify.cpp
--- a/libcxx/test/std/utilities/format/format.functions/formatted_size.verify.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/formatted_size.verify.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // Basic test to validate ill-formed code is properly detected.
 
diff --git a/libcxx/test/std/utilities/format/format.functions/locale-specific_form.pass.cpp b/libcxx/test/std/utilities/format/format.functions/locale-specific_form.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/locale-specific_form.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/locale-specific_form.pass.cpp
@@ -12,8 +12,7 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // REQUIRES: locale.en_US.UTF-8
 
diff --git a/libcxx/test/std/utilities/format/format.functions/unicode.pass.cpp b/libcxx/test/std/utilities/format/format.functions/unicode.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/unicode.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/unicode.pass.cpp
@@ -16,8 +16,7 @@
 // UNSUPPORTED: LIBCXX-AIX-FIXME
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.functions/vformat.locale.pass.cpp b/libcxx/test/std/utilities/format/format.functions/vformat.locale.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/vformat.locale.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/vformat.locale.pass.cpp
@@ -11,8 +11,7 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.functions/vformat.pass.cpp b/libcxx/test/std/utilities/format/format.functions/vformat.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/vformat.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/vformat.pass.cpp
@@ -10,8 +10,7 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.functions/vformat_to.locale.pass.cpp b/libcxx/test/std/utilities/format/format.functions/vformat_to.locale.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/vformat_to.locale.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/vformat_to.locale.pass.cpp
@@ -11,8 +11,7 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.functions/vformat_to.pass.cpp b/libcxx/test/std/utilities/format/format.functions/vformat_to.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/vformat_to.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/vformat_to.pass.cpp
@@ -10,8 +10,7 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/format.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/format.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/format.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/format.pass.cpp
@@ -12,8 +12,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/set_brackets.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/set_brackets.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/set_brackets.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/set_brackets.pass.cpp
@@ -12,8 +12,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/set_separator.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/set_separator.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/set_separator.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/set_separator.pass.cpp
@@ -12,8 +12,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.fmtkind/format_kind.compile.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.fmtkind/format_kind.compile.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.fmtkind/format_kind.compile.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.fmtkind/format_kind.compile.pass.cpp
@@ -8,8 +8,8 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
-// This test uses std::filesystem::path, which was introduced in macOS 10.15
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// This test uses std::filesystem::path, which is not always available
+// XFAIL: availability-filesystem-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.functions.format.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.functions.format.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.functions.format.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.functions.format.pass.cpp
@@ -11,8 +11,7 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.functions.vformat.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.functions.vformat.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.functions.vformat.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.functions.vformat.pass.cpp
@@ -11,8 +11,7 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.pass.cpp
@@ -12,8 +12,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.functions.format.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.functions.format.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.functions.format.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.functions.format.pass.cpp
@@ -11,8 +11,7 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.functions.vformat.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.functions.vformat.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.functions.vformat.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.functions.vformat.pass.cpp
@@ -11,8 +11,7 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.pass.cpp
@@ -12,8 +12,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.functions.format.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.functions.format.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.functions.format.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.functions.format.pass.cpp
@@ -11,8 +11,7 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.functions.vformat.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.functions.vformat.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.functions.vformat.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.functions.vformat.pass.cpp
@@ -11,8 +11,7 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.pass.cpp
@@ -12,8 +12,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.formatter/set_brackets.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.formatter/set_brackets.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.formatter/set_brackets.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.formatter/set_brackets.pass.cpp
@@ -12,8 +12,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.formatter/set_separator.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.formatter/set_separator.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.formatter/set_separator.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.formatter/set_separator.pass.cpp
@@ -12,8 +12,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.tuple/format.functions.format.pass.cpp b/libcxx/test/std/utilities/format/format.tuple/format.functions.format.pass.cpp
--- a/libcxx/test/std/utilities/format/format.tuple/format.functions.format.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.tuple/format.functions.format.pass.cpp
@@ -12,8 +12,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.tuple/format.functions.format.verify.cpp b/libcxx/test/std/utilities/format/format.tuple/format.functions.format.verify.cpp
--- a/libcxx/test/std/utilities/format/format.tuple/format.functions.format.verify.cpp
+++ b/libcxx/test/std/utilities/format/format.tuple/format.functions.format.verify.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 #include <format>
 
diff --git a/libcxx/test/std/utilities/format/format.tuple/format.functions.vformat.pass.cpp b/libcxx/test/std/utilities/format/format.tuple/format.functions.vformat.pass.cpp
--- a/libcxx/test/std/utilities/format/format.tuple/format.functions.vformat.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.tuple/format.functions.vformat.pass.cpp
@@ -10,8 +10,7 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.tuple/format.pass.cpp b/libcxx/test/std/utilities/format/format.tuple/format.pass.cpp
--- a/libcxx/test/std/utilities/format/format.tuple/format.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.tuple/format.pass.cpp
@@ -12,8 +12,7 @@
 // UNSUPPORTED: gcc-12
 
 // TODO: This test should not require std::to_chars(floating-point)
-// This test requires std::to_chars(floating-point), which is in the dylib
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+// XFAIL: availability-fp_to_chars-missing
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared.array.bounded.pass.cpp b/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared.array.bounded.pass.cpp
--- a/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared.array.bounded.pass.cpp
+++ b/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared.array.bounded.pass.cpp
@@ -8,9 +8,8 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// Aligned deallocation isn't provided before macOS 10.14, and some tests for overaligned types
-// below require that feature.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13}}
+// This test requires support for aligned allocation to test overaligned types.
+// XFAIL: availability-aligned_allocation-missing
 
 // <memory>
 
diff --git a/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared.array.unbounded.pass.cpp b/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared.array.unbounded.pass.cpp
--- a/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared.array.unbounded.pass.cpp
+++ b/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared.array.unbounded.pass.cpp
@@ -8,9 +8,8 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// Aligned deallocation isn't provided before macOS 10.14, and some tests for overaligned types
-// below require that feature.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13}}
+// This test requires support for aligned allocation to test overaligned types.
+// XFAIL: availability-aligned_allocation-missing
 
 // <memory>
 
diff --git a/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.array.bounded.pass.cpp b/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.array.bounded.pass.cpp
--- a/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.array.bounded.pass.cpp
+++ b/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.array.bounded.pass.cpp
@@ -8,9 +8,8 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// Aligned deallocation isn't provided before macOS 10.14, and some tests for overaligned types
-// below require that feature.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13}}
+// This test requires support for aligned allocation to test overaligned types.
+// XFAIL: availability-aligned_allocation-missing
 
 // <memory>
 
diff --git a/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.array.unbounded.pass.cpp b/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.array.unbounded.pass.cpp
--- a/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.array.unbounded.pass.cpp
+++ b/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.array.unbounded.pass.cpp
@@ -8,9 +8,8 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// Aligned deallocation isn't provided before macOS 10.14, and some tests for overaligned types
-// below require that feature.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13}}
+// This test requires support for aligned allocation to test overaligned types.
+// XFAIL: availability-aligned_allocation-missing
 
 // <memory>
 
diff --git a/libcxx/test/std/utilities/optional/optional.bad_optional_access/default.pass.cpp b/libcxx/test/std/utilities/optional/optional.bad_optional_access/default.pass.cpp
--- a/libcxx/test/std/utilities/optional/optional.bad_optional_access/default.pass.cpp
+++ b/libcxx/test/std/utilities/optional/optional.bad_optional_access/default.pass.cpp
@@ -7,9 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-
-// Throwing bad_optional_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-bad_optional_access-missing
 
 // <optional>
 
diff --git a/libcxx/test/std/utilities/optional/optional.bad_optional_access/derive.pass.cpp b/libcxx/test/std/utilities/optional/optional.bad_optional_access/derive.pass.cpp
--- a/libcxx/test/std/utilities/optional/optional.bad_optional_access/derive.pass.cpp
+++ b/libcxx/test/std/utilities/optional/optional.bad_optional_access/derive.pass.cpp
@@ -7,9 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-
-// Throwing bad_optional_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-bad_optional_access-missing
 
 // <optional>
 
diff --git a/libcxx/test/std/utilities/optional/optional.monadic/and_then.pass.cpp b/libcxx/test/std/utilities/optional/optional.monadic/and_then.pass.cpp
--- a/libcxx/test/std/utilities/optional/optional.monadic/and_then.pass.cpp
+++ b/libcxx/test/std/utilities/optional/optional.monadic/and_then.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
 
-// Throwing bad_optional_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_optional_access-missing && !no-exceptions
 
 // <optional>
 
diff --git a/libcxx/test/std/utilities/optional/optional.monadic/transform.pass.cpp b/libcxx/test/std/utilities/optional/optional.monadic/transform.pass.cpp
--- a/libcxx/test/std/utilities/optional/optional.monadic/transform.pass.cpp
+++ b/libcxx/test/std/utilities/optional/optional.monadic/transform.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
 
-// Throwing bad_optional_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_optional_access-missing && !no-exceptions
 
 // <optional>
 
diff --git a/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/U.pass.cpp b/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/U.pass.cpp
--- a/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/U.pass.cpp
+++ b/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/U.pass.cpp
@@ -8,8 +8,7 @@
 //
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_optional_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_optional_access-missing && !no-exceptions
 
 // <optional>
 
diff --git a/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/const_T.pass.cpp b/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/const_T.pass.cpp
--- a/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/const_T.pass.cpp
+++ b/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/const_T.pass.cpp
@@ -8,8 +8,7 @@
 //
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_optional_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_optional_access-missing && !no-exceptions
 
 // <optional>
 
diff --git a/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/move.pass.cpp b/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/move.pass.cpp
--- a/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/move.pass.cpp
+++ b/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/move.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_optional_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_optional_access-missing && !no-exceptions
 
 // <optional>
 
diff --git a/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/rvalue_T.pass.cpp b/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/rvalue_T.pass.cpp
--- a/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/rvalue_T.pass.cpp
+++ b/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/rvalue_T.pass.cpp
@@ -8,8 +8,7 @@
 //
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_optional_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_optional_access-missing && !no-exceptions
 
 // <optional>
 
diff --git a/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/value.pass.cpp b/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/value.pass.cpp
--- a/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/value.pass.cpp
+++ b/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/value.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_optional_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_optional_access-missing && !no-exceptions
 
 // <optional>
 
diff --git a/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/value_const.pass.cpp b/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/value_const.pass.cpp
--- a/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/value_const.pass.cpp
+++ b/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/value_const.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_optional_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_optional_access-missing && !no-exceptions
 
 // <optional>
 
diff --git a/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/value_const_rvalue.pass.cpp b/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/value_const_rvalue.pass.cpp
--- a/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/value_const_rvalue.pass.cpp
+++ b/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/value_const_rvalue.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_optional_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_optional_access-missing && !no-exceptions
 
 // <optional>
 
diff --git a/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/value_rvalue.pass.cpp b/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/value_rvalue.pass.cpp
--- a/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/value_rvalue.pass.cpp
+++ b/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/value_rvalue.pass.cpp
@@ -9,8 +9,7 @@
 // UNSUPPORTED: c++03, c++11, c++14
 // <optional>
 
-// Throwing bad_optional_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_optional_access-missing && !no-exceptions
 
 // constexpr T& optional<T>::value() &&;
 
diff --git a/libcxx/test/std/utilities/optional/optional.specalg/make_optional.pass.cpp b/libcxx/test/std/utilities/optional/optional.specalg/make_optional.pass.cpp
--- a/libcxx/test/std/utilities/optional/optional.specalg/make_optional.pass.cpp
+++ b/libcxx/test/std/utilities/optional/optional.specalg/make_optional.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_optional_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_optional_access-missing && !no-exceptions
 
 // <optional>
 //
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.ctor/default.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.ctor/default.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.ctor/default.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.ctor/default.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.ctor/memory_resource_convert.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.ctor/memory_resource_convert.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.ctor/memory_resource_convert.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.ctor/memory_resource_convert.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.eq/equal.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.eq/equal.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.eq/equal.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.eq/equal.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.eq/not_equal.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.eq/not_equal.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.eq/not_equal.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.eq/not_equal.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/allocate.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/allocate.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/allocate.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/allocate.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/allocate_deallocate_bytes.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/allocate_deallocate_bytes.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/allocate_deallocate_bytes.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/allocate_deallocate_bytes.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/allocate_deallocate_object.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/allocate_deallocate_object.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/allocate_deallocate_object.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/allocate_deallocate_object.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair_const_lvalue_pair.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair_const_lvalue_pair.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair_const_lvalue_pair.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair_const_lvalue_pair.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair_rvalue.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair_rvalue.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair_rvalue.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair_rvalue.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair_values.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair_values.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair_values.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair_values.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_piecewise_pair.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_piecewise_pair.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_piecewise_pair.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_piecewise_pair.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_piecewise_pair_evil.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_piecewise_pair_evil.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_piecewise_pair_evil.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_piecewise_pair_evil.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_types.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_types.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_types.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_types.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/deallocate.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/deallocate.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/deallocate.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/deallocate.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/default_type.compile.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/default_type.compile.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/default_type.compile.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/default_type.compile.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// UNSUPPORTED: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/destroy.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/destroy.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/destroy.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/destroy.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/new_delete_object.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/new_delete_object.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/new_delete_object.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/new_delete_object.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/resource.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/resource.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/resource.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/resource.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/select_on_container_copy_construction.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/select_on_container_copy_construction.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/select_on_container_copy_construction.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/select_on_container_copy_construction.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_deque_synop.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_deque_synop.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_deque_synop.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_deque_synop.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <deque>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_deque_synop2.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_deque_synop2.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_deque_synop2.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_deque_synop2.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <deque>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_forward_list_synop.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_forward_list_synop.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_forward_list_synop.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_forward_list_synop.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <forward_list>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_list_synop.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_list_synop.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_list_synop.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_list_synop.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <list>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_list_synop2.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_list_synop2.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_list_synop2.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_list_synop2.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <list>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_map_synop.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_map_synop.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_map_synop.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_map_synop.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <map>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_map_synop2.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_map_synop2.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_map_synop2.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_map_synop2.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <map>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_regex_synop.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_regex_synop.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_regex_synop.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_regex_synop.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 // UNSUPPORTED: no-localization
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <regex>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_set_synop.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_set_synop.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_set_synop.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_set_synop.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <set>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_set_synop2.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_set_synop2.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_set_synop2.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_set_synop2.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <set>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_string_synop.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_string_synop.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_string_synop.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_string_synop.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <string>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_string_synop2.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_string_synop2.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_string_synop2.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_string_synop2.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <string>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_unordered_map_synop.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_unordered_map_synop.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_unordered_map_synop.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_unordered_map_synop.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <unordered_map>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_unordered_map_synop2.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_unordered_map_synop2.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_unordered_map_synop2.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_unordered_map_synop2.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <unordered_map>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_unordered_set_synop.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_unordered_set_synop.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_unordered_set_synop.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_unordered_set_synop.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <unordered_set>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_unordered_set_synop2.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_unordered_set_synop2.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_unordered_set_synop2.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_unordered_set_synop2.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <unordered_set>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_vector_synop.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_vector_synop.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_vector_synop.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_vector_synop.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <vector>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_vector_synop2.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_vector_synop2.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_vector_synop2.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_vector_synop2.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <vector>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.global/default_resource.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.global/default_resource.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.global/default_resource.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.global/default_resource.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.global/new_delete_resource.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.global/new_delete_resource.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.global/new_delete_resource.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.global/new_delete_resource.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.global/null_memory_resource.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.global/null_memory_resource.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.global/null_memory_resource.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.global/null_memory_resource.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.ctor/with_default_resource.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.ctor/with_default_resource.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.ctor/with_default_resource.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.ctor/with_default_resource.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.ctor/without_buffer.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.ctor/without_buffer.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.ctor/without_buffer.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.ctor/without_buffer.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_deallocate.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_deallocate.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_deallocate.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_deallocate.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_exception_safety.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_exception_safety.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_exception_safety.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_exception_safety.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 // UNSUPPORTED: no-exceptions
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_from_initial_buffer.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_from_initial_buffer.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_from_initial_buffer.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_from_initial_buffer.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_from_zero_sized_buffer.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_from_zero_sized_buffer.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_from_zero_sized_buffer.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_from_zero_sized_buffer.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_in_geometric_progression.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_in_geometric_progression.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_in_geometric_progression.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_in_geometric_progression.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_overaligned_request.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_overaligned_request.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_overaligned_request.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_overaligned_request.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_with_initial_size.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_with_initial_size.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_with_initial_size.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_with_initial_size.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/equality.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/equality.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/equality.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/equality.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.ctor/ctor_does_not_allocate.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.ctor/ctor_does_not_allocate.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.ctor/ctor_does_not_allocate.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.ctor/ctor_does_not_allocate.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.ctor/sync_with_default_resource.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.ctor/sync_with_default_resource.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.ctor/sync_with_default_resource.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.ctor/sync_with_default_resource.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.ctor/unsync_with_default_resource.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.ctor/unsync_with_default_resource.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.ctor/unsync_with_default_resource.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.ctor/unsync_with_default_resource.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/equality.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/equality.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/equality.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/equality.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_allocate.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_allocate.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_allocate.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_allocate.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_allocate_overaligned_request.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_allocate_overaligned_request.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_allocate_overaligned_request.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_allocate_overaligned_request.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_allocate_reuse_blocks.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_allocate_reuse_blocks.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_allocate_reuse_blocks.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_allocate_reuse_blocks.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_deallocate_matches_allocate.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_deallocate_matches_allocate.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_deallocate_matches_allocate.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/sync_deallocate_matches_allocate.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: no-exceptions
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/unsync_allocate.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/unsync_allocate.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/unsync_allocate.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/unsync_allocate.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/unsync_allocate_overaligned_request.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/unsync_allocate_overaligned_request.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/unsync_allocate_overaligned_request.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/unsync_allocate_overaligned_request.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/unsync_allocate_reuse_blocks.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/unsync_allocate_reuse_blocks.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/unsync_allocate_reuse_blocks.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/unsync_allocate_reuse_blocks.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/unsync_deallocate_matches_allocate.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/unsync_deallocate_matches_allocate.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/unsync_deallocate_matches_allocate.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.mem/unsync_deallocate_matches_allocate.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: no-exceptions
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // <memory_resource>
 
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.eq/equal.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.eq/equal.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.eq/equal.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.eq/equal.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.eq/not_equal.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.eq/not_equal.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.eq/not_equal.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.eq/not_equal.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.public/allocate.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.public/allocate.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.public/allocate.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.public/allocate.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.public/deallocate.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.public/deallocate.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.public/deallocate.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.public/deallocate.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.public/dtor.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.public/dtor.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.public/dtor.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.public/dtor.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.public/is_equal.pass.cpp b/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.public/is_equal.pass.cpp
--- a/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.public/is_equal.pass.cpp
+++ b/libcxx/test/std/utilities/utility/mem.res/mem.res/mem.res.public/is_equal.pass.cpp
@@ -7,8 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{11.0|12.0}}
+// XFAIL: availability-pmr-missing
 
 // test_memory_resource requires RTTI for dynamic_cast
 // UNSUPPORTED: no-rtti
diff --git a/libcxx/test/std/utilities/utility/utility.unreachable/assert.unreachable.pass.cpp b/libcxx/test/std/utilities/utility/utility.unreachable/assert.unreachable.pass.cpp
--- a/libcxx/test/std/utilities/utility/utility.unreachable/assert.unreachable.pass.cpp
+++ b/libcxx/test/std/utilities/utility/utility.unreachable/assert.unreachable.pass.cpp
@@ -9,7 +9,7 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
 
 // REQUIRES: has-unix-headers
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // Make sure that reaching std::unreachable() with assertions enabled triggers an assertion.
diff --git a/libcxx/test/std/utilities/variant/variant.bad_variant_access/bad_variant_access.pass.cpp b/libcxx/test/std/utilities/variant/variant.bad_variant_access/bad_variant_access.pass.cpp
--- a/libcxx/test/std/utilities/variant/variant.bad_variant_access/bad_variant_access.pass.cpp
+++ b/libcxx/test/std/utilities/variant/variant.bad_variant_access/bad_variant_access.pass.cpp
@@ -7,9 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
+// XFAIL: availability-bad_variant_access-missing
 
 // <variant>
 
diff --git a/libcxx/test/std/utilities/variant/variant.get/get_index.pass.cpp b/libcxx/test/std/utilities/variant/variant.get/get_index.pass.cpp
--- a/libcxx/test/std/utilities/variant/variant.get/get_index.pass.cpp
+++ b/libcxx/test/std/utilities/variant/variant.get/get_index.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
diff --git a/libcxx/test/std/utilities/variant/variant.get/get_type.pass.cpp b/libcxx/test/std/utilities/variant/variant.get/get_type.pass.cpp
--- a/libcxx/test/std/utilities/variant/variant.get/get_type.pass.cpp
+++ b/libcxx/test/std/utilities/variant/variant.get/get_type.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
diff --git a/libcxx/test/std/utilities/variant/variant.variant/variant.assign/T.pass.cpp b/libcxx/test/std/utilities/variant/variant.variant/variant.assign/T.pass.cpp
--- a/libcxx/test/std/utilities/variant/variant.variant/variant.assign/T.pass.cpp
+++ b/libcxx/test/std/utilities/variant/variant.variant/variant.assign/T.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
diff --git a/libcxx/test/std/utilities/variant/variant.variant/variant.assign/copy.pass.cpp b/libcxx/test/std/utilities/variant/variant.variant/variant.assign/copy.pass.cpp
--- a/libcxx/test/std/utilities/variant/variant.variant/variant.assign/copy.pass.cpp
+++ b/libcxx/test/std/utilities/variant/variant.variant/variant.assign/copy.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
diff --git a/libcxx/test/std/utilities/variant/variant.variant/variant.assign/move.pass.cpp b/libcxx/test/std/utilities/variant/variant.variant/variant.assign/move.pass.cpp
--- a/libcxx/test/std/utilities/variant/variant.variant/variant.assign/move.pass.cpp
+++ b/libcxx/test/std/utilities/variant/variant.variant/variant.assign/move.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
diff --git a/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/T.pass.cpp b/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/T.pass.cpp
--- a/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/T.pass.cpp
+++ b/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/T.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
diff --git a/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/copy.pass.cpp b/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/copy.pass.cpp
--- a/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/copy.pass.cpp
+++ b/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/copy.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
diff --git a/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/default.pass.cpp b/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/default.pass.cpp
--- a/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/default.pass.cpp
+++ b/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/default.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
diff --git a/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/in_place_index_args.pass.cpp b/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/in_place_index_args.pass.cpp
--- a/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/in_place_index_args.pass.cpp
+++ b/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/in_place_index_args.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
diff --git a/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/in_place_index_init_list_args.pass.cpp b/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/in_place_index_init_list_args.pass.cpp
--- a/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/in_place_index_init_list_args.pass.cpp
+++ b/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/in_place_index_init_list_args.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
diff --git a/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/in_place_type_args.pass.cpp b/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/in_place_type_args.pass.cpp
--- a/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/in_place_type_args.pass.cpp
+++ b/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/in_place_type_args.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
diff --git a/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/in_place_type_init_list_args.pass.cpp b/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/in_place_type_init_list_args.pass.cpp
--- a/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/in_place_type_init_list_args.pass.cpp
+++ b/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/in_place_type_init_list_args.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
diff --git a/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/move.pass.cpp b/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/move.pass.cpp
--- a/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/move.pass.cpp
+++ b/libcxx/test/std/utilities/variant/variant.variant/variant.ctor/move.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
diff --git a/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_index_args.pass.cpp b/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_index_args.pass.cpp
--- a/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_index_args.pass.cpp
+++ b/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_index_args.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
diff --git a/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_index_init_list_args.pass.cpp b/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_index_init_list_args.pass.cpp
--- a/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_index_init_list_args.pass.cpp
+++ b/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_index_init_list_args.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
diff --git a/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_type_args.pass.cpp b/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_type_args.pass.cpp
--- a/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_type_args.pass.cpp
+++ b/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_type_args.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
diff --git a/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_type_init_list_args.pass.cpp b/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_type_init_list_args.pass.cpp
--- a/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_type_init_list_args.pass.cpp
+++ b/libcxx/test/std/utilities/variant/variant.variant/variant.mod/emplace_type_init_list_args.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
diff --git a/libcxx/test/std/utilities/variant/variant.variant/variant.swap/swap.pass.cpp b/libcxx/test/std/utilities/variant/variant.variant/variant.swap/swap.pass.cpp
--- a/libcxx/test/std/utilities/variant/variant.variant/variant.swap/swap.pass.cpp
+++ b/libcxx/test/std/utilities/variant/variant.variant/variant.swap/swap.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 
diff --git a/libcxx/test/std/utilities/variant/variant.visit/robust_against_adl.pass.cpp b/libcxx/test/std/utilities/variant/variant.visit/robust_against_adl.pass.cpp
--- a/libcxx/test/std/utilities/variant/variant.visit/robust_against_adl.pass.cpp
+++ b/libcxx/test/std/utilities/variant/variant.visit/robust_against_adl.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 // template <class Visitor, class... Variants>
diff --git a/libcxx/test/std/utilities/variant/variant.visit/visit.pass.cpp b/libcxx/test/std/utilities/variant/variant.visit/visit.pass.cpp
--- a/libcxx/test/std/utilities/variant/variant.visit/visit.pass.cpp
+++ b/libcxx/test/std/utilities/variant/variant.visit/visit.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 // template <class Visitor, class... Variants>
diff --git a/libcxx/test/std/utilities/variant/variant.visit/visit_return_type.pass.cpp b/libcxx/test/std/utilities/variant/variant.visit/visit_return_type.pass.cpp
--- a/libcxx/test/std/utilities/variant/variant.visit/visit_return_type.pass.cpp
+++ b/libcxx/test/std/utilities/variant/variant.visit/visit_return_type.pass.cpp
@@ -8,8 +8,7 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// Throwing bad_variant_access is supported starting in macosx10.13
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
+// XFAIL: availability-bad_variant_access-missing && !no-exceptions
 
 // <variant>
 // template <class R, class Visitor, class... Variants>
diff --git a/libcxx/test/support/test.support/test_check_assertion.pass.cpp b/libcxx/test/support/test.support/test_check_assertion.pass.cpp
--- a/libcxx/test/support/test.support/test_check_assertion.pass.cpp
+++ b/libcxx/test/support/test.support/test_check_assertion.pass.cpp
@@ -8,7 +8,7 @@
 
 // REQUIRES: has-unix-headers
 // UNSUPPORTED: c++03
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
+// XFAIL: availability-verbose_abort-missing
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 #include <cassert>
diff --git a/libcxx/utils/libcxx/test/features.py b/libcxx/utils/libcxx/test/features.py
--- a/libcxx/utils/libcxx/test/features.py
+++ b/libcxx/utils/libcxx/test/features.py
@@ -7,10 +7,11 @@
 #===----------------------------------------------------------------------===##
 
 from libcxx.test.dsl import *
+from lit.BooleanExpression import BooleanExpression
 import re
 import shutil
-import sys
 import subprocess
+import sys
 
 _isClang      = lambda cfg: '__clang__' in compilerMacros(cfg) and '__apple_build_version__' not in compilerMacros(cfg)
 _isAppleClang = lambda cfg: '__apple_build_version__' in compilerMacros(cfg)
@@ -318,3 +319,54 @@
     actions=[AddSubstitution('%{gdb}', lambda cfg: shutil.which('gdb'))]
   )
 ]
+
+# Define features for back-deployment testing.
+# These features can be used to XFAIL tests that require features in the dylib that
+# were not supported by a certain target. Vendors can tweak how those are defined
+# to match their own releases of the dylib.
+DEFAULT_FEATURES += [
+  # Tests that require std::to_chars(floating-point) in the built library
+  Feature(name='availability-fp_to_chars-missing',
+    when=lambda cfg: BooleanExpression.evaluate('use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}', cfg.available_features)),
+
+  # Tests that require https://wg21.link/P0482 support in the built library
+  Feature(name='availability-char8_t_support-missing',
+    when=lambda cfg: BooleanExpression.evaluate('use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}', cfg.available_features)),
+
+  # Tests that require __libcpp_verbose_abort support in the built library
+  Feature(name='availability-verbose_abort-missing',
+    when=lambda cfg: BooleanExpression.evaluate('use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}', cfg.available_features)),
+
+  # Tests that require std::bad_variant_access in the built library
+  Feature(name='availability-bad_variant_access-missing',
+    when=lambda cfg: BooleanExpression.evaluate('use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}', cfg.available_features)),
+
+  # Tests that require std::bad_optional_access in the built library
+  Feature(name='availability-bad_optional_access-missing',
+    when=lambda cfg: BooleanExpression.evaluate('use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}', cfg.available_features)),
+
+  # Tests that require std::bad_any_cast in the built library
+  Feature(name='availability-bad_any_cast-missing',
+    when=lambda cfg: BooleanExpression.evaluate('use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}', cfg.available_features)),
+
+  # Tests that require std::pmr support in the built library
+  Feature(name='availability-pmr-missing',
+    when=lambda cfg: BooleanExpression.evaluate('use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}', cfg.available_features)),
+
+  # Tests that require std::filesystem support in the built library
+  Feature(name='availability-filesystem-missing',
+    when=lambda cfg: BooleanExpression.evaluate('use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}', cfg.available_features)),
+
+  # Tests that require the C++20 synchronization library (P1135R6 implemented by https://llvm.org/D68480) in the built library
+  Feature(name='availability-synchronization_library-missing',
+    when=lambda cfg: BooleanExpression.evaluate('use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}', cfg.available_features)),
+
+  # Tests that require support for std::shared_mutex and std::shared_timed_mutex in the built library
+  Feature(name='availability-shared_mutex-missing',
+    when=lambda cfg: BooleanExpression.evaluate('use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}', cfg.available_features)),
+
+  # Tests that require support for aligned allocation in the built library. This is about `operator new(..., std::align_val_t, ...)` specifically,
+  # not other forms of aligned allocation.
+  Feature(name='availability-aligned_allocation-missing',
+    when=lambda cfg: BooleanExpression.evaluate('use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}', cfg.available_features)),
+]