diff --git a/libcxx/test/libcxx/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle.depr_in_cxx14.verify.cpp b/libcxx/test/libcxx/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle.depr_in_cxx14.verify.cpp
--- a/libcxx/test/libcxx/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle.depr_in_cxx14.verify.cpp
+++ b/libcxx/test/libcxx/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle.depr_in_cxx14.verify.cpp
@@ -17,7 +17,6 @@
 //     random_shuffle(RandomAccessIterator first, RandomAccessIterator last,
 //                    RandomNumberGenerator& rand);
 
-// UNSUPPORTED: clang-4.0
 // UNSUPPORTED: c++03, c++11
 
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_CXX17_REMOVED_RANDOM_SHUFFLE
diff --git a/libcxx/test/libcxx/atomics/ext-int.verify.cpp b/libcxx/test/libcxx/atomics/ext-int.verify.cpp
--- a/libcxx/test/libcxx/atomics/ext-int.verify.cpp
+++ b/libcxx/test/libcxx/atomics/ext-int.verify.cpp
@@ -12,8 +12,7 @@
 // disable them for now until their behavior can be designed better later.
 // See https://reviews.llvm.org/D84049 for details.
 
-// UNSUPPORTED: clang-4, clang-5, clang-6, clang-7, clang-8, clang-9, clang-10
-// UNSUPPORTED: apple-clang-9, apple-clang-10, apple-clang-11, apple-clang-12
+// UNSUPPORTED: apple-clang-12
 
 // UNSUPPORTED: libcpp-has-no-threads
 // UNSUPPORTED: c++03
diff --git a/libcxx/test/libcxx/containers/unord/unord.set/missing_hash_specialization.fail.cpp b/libcxx/test/libcxx/containers/unord/unord.set/missing_hash_specialization.fail.cpp
--- a/libcxx/test/libcxx/containers/unord/unord.set/missing_hash_specialization.fail.cpp
+++ b/libcxx/test/libcxx/containers/unord/unord.set/missing_hash_specialization.fail.cpp
@@ -13,9 +13,6 @@
 // newer.
 // UNSUPPORTED: c++11
 
-// Clang doesn't support filename wildcards in verify tests until 05eedf1f5b44.
-// UNSUPPORTED: clang-10
-
 // <unordered_set>
 
 // Test that we generate a reasonable diagnostic when the specified hash is
diff --git a/libcxx/test/libcxx/depr/depr.auto.ptr/auto.ptr/auto_ptr.depr_in_cxx11.verify.cpp b/libcxx/test/libcxx/depr/depr.auto.ptr/auto.ptr/auto_ptr.depr_in_cxx11.verify.cpp
--- a/libcxx/test/libcxx/depr/depr.auto.ptr/auto.ptr/auto_ptr.depr_in_cxx11.verify.cpp
+++ b/libcxx/test/libcxx/depr/depr.auto.ptr/auto.ptr/auto_ptr.depr_in_cxx11.verify.cpp
@@ -18,7 +18,6 @@
 //
 // Deprecated in C++11
 
-// UNSUPPORTED: clang-4.0
 // UNSUPPORTED: c++03
 
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR
diff --git a/libcxx/test/libcxx/depr/depr.function.objects/adaptors.depr_in_cxx11.verify.cpp b/libcxx/test/libcxx/depr/depr.function.objects/adaptors.depr_in_cxx11.verify.cpp
--- a/libcxx/test/libcxx/depr/depr.function.objects/adaptors.depr_in_cxx11.verify.cpp
+++ b/libcxx/test/libcxx/depr/depr.function.objects/adaptors.depr_in_cxx11.verify.cpp
@@ -8,7 +8,6 @@
 
 // <functional>
 
-// UNSUPPORTED: clang-4.0
 // UNSUPPORTED: c++03
 
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_CXX17_REMOVED_BINDERS
diff --git a/libcxx/test/libcxx/diagnostics/nodiscard_extensions.pass.cpp b/libcxx/test/libcxx/diagnostics/nodiscard_extensions.pass.cpp
--- a/libcxx/test/libcxx/diagnostics/nodiscard_extensions.pass.cpp
+++ b/libcxx/test/libcxx/diagnostics/nodiscard_extensions.pass.cpp
@@ -13,10 +13,6 @@
 // This test intentionally leaks memory, so it is unsupported under ASAN.
 // UNSUPPORTED: asan
 
-// AppleClang9 and GCC 5 don't support C++17's implicitly synthesized
-// deduction guides from existing ctors, needed by default_searcher() below.
-// UNSUPPORTED: apple-clang-9
-
 // All entities to which libc++ applies [[nodiscard]] as an extension should
 // be tested here and in nodiscard_extensions.fail.cpp. They should also
 // be listed in `UsingLibcxx.rst` in the documentation for the extension.
diff --git a/libcxx/test/libcxx/diagnostics/nodiscard_extensions.verify.cpp b/libcxx/test/libcxx/diagnostics/nodiscard_extensions.verify.cpp
--- a/libcxx/test/libcxx/diagnostics/nodiscard_extensions.verify.cpp
+++ b/libcxx/test/libcxx/diagnostics/nodiscard_extensions.verify.cpp
@@ -9,10 +9,6 @@
 
 // UNSUPPORTED: c++03
 
-// AppleClang9 doesn't yet support C++17's implicitly synthesized deduction
-// guides from existing ctors, needed by default_searcher() below.
-// UNSUPPORTED: apple-clang-9
-
 // Test that entities declared [[nodiscard]] as an extension by libc++, are
 // only actually declared such when _LIBCPP_ENABLE_NODISCARD is specified.
 
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
@@ -7,15 +7,11 @@
 //===----------------------------------------------------------------------===//
 
 // Make sure we get compile-time availability errors when trying to use aligned
-// allocation/deallocation on deployment targets that don't support it.
+// allocation/deallocation on deployment targets that don't support it (before macosx10.14).
 
 // UNSUPPORTED: c++03, c++11, c++14
 
 // Aligned allocation was not provided before macosx10.14.
-// Support for that is broken prior to Clang 8 and Apple Clang 11.
-// UNSUPPORTED: apple-clang-9, apple-clang-10
-// UNSUPPORTED: clang-5, clang-6, clang-7
-
 // REQUIRES: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13}}
 
 #include <new>
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
@@ -22,10 +22,6 @@
 // nor does the dynamic library shipped with z/OS.
 // UNSUPPORTED: target={{.+}}-zos{{.*}}
 
-// AppleClang < 10 incorrectly warns that aligned allocation is not supported
-// even when it is supported.
-// UNSUPPORTED: apple-clang-9
-
 // XFAIL: sanitizer-new-delete, ubsan
 
 // GCC doesn't support the aligned-allocation flags.
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
@@ -8,10 +8,6 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// AppleClang <= 10 enables aligned allocation regardless of the deployment
-// target, so this test would fail.
-// UNSUPPORTED: apple-clang-9, apple-clang-10
-
 // XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13}}
 
 #include <new>
diff --git a/libcxx/test/libcxx/memory/trivial_abi/shared_ptr_arg.pass.cpp b/libcxx/test/libcxx/memory/trivial_abi/shared_ptr_arg.pass.cpp
--- a/libcxx/test/libcxx/memory/trivial_abi/shared_ptr_arg.pass.cpp
+++ b/libcxx/test/libcxx/memory/trivial_abi/shared_ptr_arg.pass.cpp
@@ -12,8 +12,7 @@
 
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ABI_ENABLE_SHARED_PTR_TRIVIAL_ABI
 
-// There were assertion failures in both parse and codegen, which are fixed in clang 11.
-// UNSUPPORTED: gcc, clang-4, clang-5, clang-6, clang-7, clang-8, clang-9, clang-10
+// XFAIL: gcc
 // UNSUPPORTED: c++03
 
 #include <memory>
diff --git a/libcxx/test/libcxx/memory/trivial_abi/unique_ptr_arg.pass.cpp b/libcxx/test/libcxx/memory/trivial_abi/unique_ptr_arg.pass.cpp
--- a/libcxx/test/libcxx/memory/trivial_abi/unique_ptr_arg.pass.cpp
+++ b/libcxx/test/libcxx/memory/trivial_abi/unique_ptr_arg.pass.cpp
@@ -12,8 +12,7 @@
 
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ABI_ENABLE_UNIQUE_PTR_TRIVIAL_ABI
 
-// There were assertion failures in both parse and codegen, which are fixed in clang 11.
-// UNSUPPORTED: gcc, clang-4, clang-5, clang-6, clang-7, clang-8, clang-9, clang-10
+// XFAIL: gcc
 
 #include <memory>
 #include <cassert>
diff --git a/libcxx/test/libcxx/memory/trivial_abi/unique_ptr_array.pass.cpp b/libcxx/test/libcxx/memory/trivial_abi/unique_ptr_array.pass.cpp
--- a/libcxx/test/libcxx/memory/trivial_abi/unique_ptr_array.pass.cpp
+++ b/libcxx/test/libcxx/memory/trivial_abi/unique_ptr_array.pass.cpp
@@ -12,8 +12,7 @@
 
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ABI_ENABLE_UNIQUE_PTR_TRIVIAL_ABI
 
-// There were assertion failures in both parse and codegen, which are fixed in clang 11.
-// UNSUPPORTED: gcc, clang-4, clang-5, clang-6, clang-7, clang-8, clang-9, clang-10
+// XFAIL: gcc
 // UNSUPPORTED: c++03
 
 #include <memory>
diff --git a/libcxx/test/libcxx/memory/trivial_abi/unique_ptr_destruction_order.pass.cpp b/libcxx/test/libcxx/memory/trivial_abi/unique_ptr_destruction_order.pass.cpp
--- a/libcxx/test/libcxx/memory/trivial_abi/unique_ptr_destruction_order.pass.cpp
+++ b/libcxx/test/libcxx/memory/trivial_abi/unique_ptr_destruction_order.pass.cpp
@@ -12,9 +12,7 @@
 
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ABI_ENABLE_UNIQUE_PTR_TRIVIAL_ABI
 
-// There were assertion failures in both parse and codegen, which are fixed in clang 11.
-// UNSUPPORTED: gcc, clang-4, clang-5, clang-6, clang-7, clang-8, clang-9, clang-10
-
+// XFAIL: gcc
 
 #include <memory>
 #include <cassert>
diff --git a/libcxx/test/libcxx/memory/trivial_abi/unique_ptr_ret.pass.cpp b/libcxx/test/libcxx/memory/trivial_abi/unique_ptr_ret.pass.cpp
--- a/libcxx/test/libcxx/memory/trivial_abi/unique_ptr_ret.pass.cpp
+++ b/libcxx/test/libcxx/memory/trivial_abi/unique_ptr_ret.pass.cpp
@@ -12,8 +12,7 @@
 
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ABI_ENABLE_UNIQUE_PTR_TRIVIAL_ABI
 
-// There were assertion failures in both parse and codegen, which are fixed in clang 11.
-// UNSUPPORTED: gcc, clang-4, clang-5, clang-6, clang-7, clang-8, clang-9, clang-10
+// XFAIL: gcc
 
 #include <memory>
 #include <cassert>
diff --git a/libcxx/test/libcxx/memory/trivial_abi/weak_ptr_ret.pass.cpp b/libcxx/test/libcxx/memory/trivial_abi/weak_ptr_ret.pass.cpp
--- a/libcxx/test/libcxx/memory/trivial_abi/weak_ptr_ret.pass.cpp
+++ b/libcxx/test/libcxx/memory/trivial_abi/weak_ptr_ret.pass.cpp
@@ -12,8 +12,7 @@
 
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ABI_ENABLE_SHARED_PTR_TRIVIAL_ABI
 
-// There were assertion failures in both parse and codegen, which are fixed in clang 11.
-// UNSUPPORTED: gcc, clang-4, clang-5, clang-6, clang-7, clang-8, clang-9, clang-10
+// XFAIL: gcc
 
 #include <memory>
 #include <cassert>
diff --git a/libcxx/test/libcxx/thread/thread.lock/thread.lock.guard/nodiscard.verify.cpp b/libcxx/test/libcxx/thread/thread.lock/thread.lock.guard/nodiscard.verify.cpp
--- a/libcxx/test/libcxx/thread/thread.lock/thread.lock.guard/nodiscard.verify.cpp
+++ b/libcxx/test/libcxx/thread/thread.lock/thread.lock.guard/nodiscard.verify.cpp
@@ -8,10 +8,6 @@
 
 // UNSUPPORTED: libcpp-has-no-threads
 
-// [[nodiscard]] on constructors isn't supported by all compilers
-// UNSUPPORTED: clang-6, clang-7, clang-8, clang-9
-// UNSUPPORTED: apple-clang-9, apple-clang-10, apple-clang-11
-
 // [[nodiscard]] isn't supported in C++03 (not even as an extension)
 // UNSUPPORTED: c++03
 
diff --git a/libcxx/test/libcxx/utilities/memory/util.smartptr/util.smartptr.shared/function_type_default_deleter.fail.cpp b/libcxx/test/libcxx/utilities/memory/util.smartptr/util.smartptr.shared/function_type_default_deleter.fail.cpp
--- a/libcxx/test/libcxx/utilities/memory/util.smartptr/util.smartptr.shared/function_type_default_deleter.fail.cpp
+++ b/libcxx/test/libcxx/utilities/memory/util.smartptr/util.smartptr.shared/function_type_default_deleter.fail.cpp
@@ -8,9 +8,6 @@
 
 // UNSUPPORTED: c++03
 
-// Clang doesn't support filename wildcards in verify tests until 05eedf1f5b44.
-// UNSUPPORTED: clang-10
-
 #include <memory>
 
 template <int> struct Tag {};
diff --git a/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/copy.pass.cpp b/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/copy.pass.cpp
--- a/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/copy.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/copy.pass.cpp
@@ -6,8 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: clang-8
-
 // <algorithm>
 
 // template<InputIterator InIter, OutputIterator<auto, InIter::reference> OutIter>
diff --git a/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/copy_backward.pass.cpp b/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/copy_backward.pass.cpp
--- a/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/copy_backward.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/copy_backward.pass.cpp
@@ -6,8 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: clang-8
-
 // <algorithm>
 
 // template<BidirectionalIterator InIter, BidirectionalIterator OutIter>
diff --git a/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/copy_n.pass.cpp b/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/copy_n.pass.cpp
--- a/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/copy_n.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/copy_n.pass.cpp
@@ -6,8 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: clang-8
-
 // <algorithm>
 
 // template<InputIterator InIter, OutputIterator<auto, InIter::reference> OutIter>
diff --git a/libcxx/test/std/algorithms/alg.modifying.operations/alg.move/contiguous_trivial_optimization.pass.cpp b/libcxx/test/std/algorithms/alg.modifying.operations/alg.move/contiguous_trivial_optimization.pass.cpp
--- a/libcxx/test/std/algorithms/alg.modifying.operations/alg.move/contiguous_trivial_optimization.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.modifying.operations/alg.move/contiguous_trivial_optimization.pass.cpp
@@ -6,9 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// Older compilers don't support std::is_constant_evaluated
-// UNSUPPORTED: clang-4, clang-5, clang-6, clang-7, clang-8
-// UNSUPPORTED: apple-clang-9, apple-clang-10
 // UNSUPPORTED: c++03
 
 // <algorithm>
diff --git a/libcxx/test/std/algorithms/alg.modifying.operations/alg.move/move.pass.cpp b/libcxx/test/std/algorithms/alg.modifying.operations/alg.move/move.pass.cpp
--- a/libcxx/test/std/algorithms/alg.modifying.operations/alg.move/move.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.modifying.operations/alg.move/move.pass.cpp
@@ -13,10 +13,6 @@
 //   OutIter
 //   move(InIter first, InIter last, OutIter result);
 
-// Older compilers don't support std::is_constant_evaluated
-// UNSUPPORTED: clang-4, clang-5, clang-6, clang-7, clang-8
-// UNSUPPORTED: apple-clang-9, apple-clang-10, apple-clang-11
-
 #include <algorithm>
 #include <cassert>
 #include <memory>
diff --git a/libcxx/test/std/algorithms/alg.modifying.operations/alg.move/move_backward.pass.cpp b/libcxx/test/std/algorithms/alg.modifying.operations/alg.move/move_backward.pass.cpp
--- a/libcxx/test/std/algorithms/alg.modifying.operations/alg.move/move_backward.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.modifying.operations/alg.move/move_backward.pass.cpp
@@ -6,10 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// Older compilers don't support std::is_constant_evaluated
-// UNSUPPORTED: clang-4, clang-5, clang-6, clang-7, clang-8
-// UNSUPPORTED: apple-clang-9, apple-clang-10
-
 // <algorithm>
 
 // template<BidirectionalIterator InIter, BidirectionalIterator OutIter>
diff --git a/libcxx/test/std/algorithms/alg.modifying.operations/alg.rotate/rotate.pass.cpp b/libcxx/test/std/algorithms/alg.modifying.operations/alg.rotate/rotate.pass.cpp
--- a/libcxx/test/std/algorithms/alg.modifying.operations/alg.rotate/rotate.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.modifying.operations/alg.rotate/rotate.pass.cpp
@@ -12,10 +12,6 @@
 //   Iter
 //   rotate(Iter first, Iter middle, Iter last);
 
-// Older compilers don't support std::is_constant_evaluated
-// UNSUPPORTED: clang-4, clang-5, clang-6, clang-7, clang-8
-// UNSUPPORTED: apple-clang-9, apple-clang-10
-
 #include <algorithm>
 #include <cassert>
 #include <memory>
diff --git a/libcxx/test/std/algorithms/alg.modifying.operations/alg.rotate/rotate_copy.pass.cpp b/libcxx/test/std/algorithms/alg.modifying.operations/alg.rotate/rotate_copy.pass.cpp
--- a/libcxx/test/std/algorithms/alg.modifying.operations/alg.rotate/rotate_copy.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.modifying.operations/alg.rotate/rotate_copy.pass.cpp
@@ -12,10 +12,6 @@
 //   constexpr OutIter          // constexpr after C++17
 //   rotate_copy(InIter first, InIter middle, InIter last, OutIter result);
 
-// Older compilers don't support std::is_constant_evaluated
-// UNSUPPORTED: clang-4, clang-5, clang-6, clang-7, clang-8
-// UNSUPPORTED: apple-clang-9, apple-clang-10
-
 #include <algorithm>
 #include <cassert>
 
diff --git a/libcxx/test/std/algorithms/alg.sorting/alg.merge/merge.pass.cpp b/libcxx/test/std/algorithms/alg.sorting/alg.merge/merge.pass.cpp
--- a/libcxx/test/std/algorithms/alg.sorting/alg.merge/merge.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.sorting/alg.merge/merge.pass.cpp
@@ -6,8 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: clang-8
-
 // <algorithm>
 
 // template<InputIterator InIter1, InputIterator InIter2, typename OutIter>
diff --git a/libcxx/test/std/algorithms/alg.sorting/alg.merge/merge_comp.pass.cpp b/libcxx/test/std/algorithms/alg.sorting/alg.merge/merge_comp.pass.cpp
--- a/libcxx/test/std/algorithms/alg.sorting/alg.merge/merge_comp.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.sorting/alg.merge/merge_comp.pass.cpp
@@ -6,8 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: clang-8
-
 // <algorithm>
 
 // template<InputIterator InIter1, InputIterator InIter2, typename OutIter,
diff --git a/libcxx/test/std/algorithms/alg.sorting/alg.set.operations/set.difference/set_difference.pass.cpp b/libcxx/test/std/algorithms/alg.sorting/alg.set.operations/set.difference/set_difference.pass.cpp
--- a/libcxx/test/std/algorithms/alg.sorting/alg.set.operations/set.difference/set_difference.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.sorting/alg.set.operations/set.difference/set_difference.pass.cpp
@@ -6,8 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: clang-8
-
 // <algorithm>
 
 // template<InputIterator InIter1, InputIterator InIter2, typename OutIter>
diff --git a/libcxx/test/std/algorithms/alg.sorting/alg.set.operations/set.difference/set_difference_comp.pass.cpp b/libcxx/test/std/algorithms/alg.sorting/alg.set.operations/set.difference/set_difference_comp.pass.cpp
--- a/libcxx/test/std/algorithms/alg.sorting/alg.set.operations/set.difference/set_difference_comp.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.sorting/alg.set.operations/set.difference/set_difference_comp.pass.cpp
@@ -6,8 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: clang-8
-
 // <algorithm>
 
 // template<InputIterator InIter1, InputIterator InIter2, typename OutIter,
diff --git a/libcxx/test/std/algorithms/alg.sorting/alg.set.operations/set.symmetric.difference/set_symmetric_difference.pass.cpp b/libcxx/test/std/algorithms/alg.sorting/alg.set.operations/set.symmetric.difference/set_symmetric_difference.pass.cpp
--- a/libcxx/test/std/algorithms/alg.sorting/alg.set.operations/set.symmetric.difference/set_symmetric_difference.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.sorting/alg.set.operations/set.symmetric.difference/set_symmetric_difference.pass.cpp
@@ -6,8 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: clang-8
-
 // <algorithm>
 
 // template<InputIterator InIter1, InputIterator InIter2, typename OutIter>
diff --git a/libcxx/test/std/algorithms/alg.sorting/alg.set.operations/set.symmetric.difference/set_symmetric_difference_comp.pass.cpp b/libcxx/test/std/algorithms/alg.sorting/alg.set.operations/set.symmetric.difference/set_symmetric_difference_comp.pass.cpp
--- a/libcxx/test/std/algorithms/alg.sorting/alg.set.operations/set.symmetric.difference/set_symmetric_difference_comp.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.sorting/alg.set.operations/set.symmetric.difference/set_symmetric_difference_comp.pass.cpp
@@ -6,8 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: clang-8
-
 // <algorithm>
 
 // template<InputIterator InIter1, InputIterator InIter2, typename OutIter,
diff --git a/libcxx/test/std/algorithms/alg.sorting/alg.set.operations/set.union/set_union.pass.cpp b/libcxx/test/std/algorithms/alg.sorting/alg.set.operations/set.union/set_union.pass.cpp
--- a/libcxx/test/std/algorithms/alg.sorting/alg.set.operations/set.union/set_union.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.sorting/alg.set.operations/set.union/set_union.pass.cpp
@@ -6,8 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: clang-8
-
 // <algorithm>
 
 // template<InputIterator InIter1, InputIterator InIter2, typename OutIter>
diff --git a/libcxx/test/std/algorithms/alg.sorting/alg.set.operations/set.union/set_union_comp.pass.cpp b/libcxx/test/std/algorithms/alg.sorting/alg.set.operations/set.union/set_union_comp.pass.cpp
--- a/libcxx/test/std/algorithms/alg.sorting/alg.set.operations/set.union/set_union_comp.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.sorting/alg.set.operations/set.union/set_union_comp.pass.cpp
@@ -6,8 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: clang-8
-
 // <algorithm>
 
 // template<InputIterator InIter1, InputIterator InIter2, typename OutIter,
diff --git a/libcxx/test/std/algorithms/robust_against_adl.pass.cpp b/libcxx/test/std/algorithms/robust_against_adl.pass.cpp
--- a/libcxx/test/std/algorithms/robust_against_adl.pass.cpp
+++ b/libcxx/test/std/algorithms/robust_against_adl.pass.cpp
@@ -6,7 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: clang-8
 // UNSUPPORTED: c++03
 
 // <algorithm>
diff --git a/libcxx/test/std/containers/associative/map/map.cons/deduct.fail.cpp b/libcxx/test/std/containers/associative/map/map.cons/deduct.fail.cpp
--- a/libcxx/test/std/containers/associative/map/map.cons/deduct.fail.cpp
+++ b/libcxx/test/std/containers/associative/map/map.cons/deduct.fail.cpp
@@ -6,10 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
-// <map>
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: clang-6, apple-clang-9.0, apple-clang-9.1, apple-clang-10.0.0
-//  clang-6 gives different error messages.
+
+// <map>
 
 // template<class InputIterator,
 //          class Compare = less<iter-value-type<InputIterator>>,
diff --git a/libcxx/test/std/containers/associative/multimap/multimap.cons/deduct.fail.cpp b/libcxx/test/std/containers/associative/multimap/multimap.cons/deduct.fail.cpp
--- a/libcxx/test/std/containers/associative/multimap/multimap.cons/deduct.fail.cpp
+++ b/libcxx/test/std/containers/associative/multimap/multimap.cons/deduct.fail.cpp
@@ -6,10 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
-// <map>
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: clang-6, apple-clang-9.0, apple-clang-9.1, apple-clang-10.0.0
-//  clang-6 gives different error messages.
+
+// <map>
 
 // template<class InputIterator,
 //          class Compare = less<iter-value-type<InputIterator>>,
diff --git a/libcxx/test/std/containers/associative/multiset/multiset.cons/deduct.fail.cpp b/libcxx/test/std/containers/associative/multiset/multiset.cons/deduct.fail.cpp
--- a/libcxx/test/std/containers/associative/multiset/multiset.cons/deduct.fail.cpp
+++ b/libcxx/test/std/containers/associative/multiset/multiset.cons/deduct.fail.cpp
@@ -6,10 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
-// <set>
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: clang-6, apple-clang-9.0, apple-clang-9.1, apple-clang-10.0.0
-//  clang-6 gives different error messages.
+
+// <set>
 
 // template<class InputIterator,
 //          class Compare = less<iter-value-type<InputIterator>>,
diff --git a/libcxx/test/std/containers/associative/multiset/multiset.cons/deduct.pass.cpp b/libcxx/test/std/containers/associative/multiset/multiset.cons/deduct.pass.cpp
--- a/libcxx/test/std/containers/associative/multiset/multiset.cons/deduct.pass.cpp
+++ b/libcxx/test/std/containers/associative/multiset/multiset.cons/deduct.pass.cpp
@@ -6,9 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
-// <set>
 // UNSUPPORTED: c++03, c++11, c++14
-// UNSUPPORTED: apple-clang-9.1
+
+// <set>
 
 // template<class InputIterator,
 //          class Compare = less<iter-value-type<InputIterator>>,
diff --git a/libcxx/test/std/containers/associative/set/set.cons/deduct.fail.cpp b/libcxx/test/std/containers/associative/set/set.cons/deduct.fail.cpp
--- a/libcxx/test/std/containers/associative/set/set.cons/deduct.fail.cpp
+++ b/libcxx/test/std/containers/associative/set/set.cons/deduct.fail.cpp
@@ -6,10 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
-// <set>
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: clang-6, apple-clang-9.0, apple-clang-9.1, apple-clang-10.0.0
-//  clang-6 gives different error messages.
+
+// <set>
 
 // template<class InputIterator,
 //          class Compare = less<iter-value-type<InputIterator>>,
diff --git a/libcxx/test/std/containers/associative/set/set.cons/deduct.pass.cpp b/libcxx/test/std/containers/associative/set/set.cons/deduct.pass.cpp
--- a/libcxx/test/std/containers/associative/set/set.cons/deduct.pass.cpp
+++ b/libcxx/test/std/containers/associative/set/set.cons/deduct.pass.cpp
@@ -6,9 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
-// <set>
 // UNSUPPORTED: c++03, c++11, c++14
-// UNSUPPORTED: apple-clang-9.1
+
+// <set>
 
 // template<class InputIterator,
 //          class Compare = less<iter-value-type<InputIterator>>,
diff --git a/libcxx/test/std/containers/container.adaptors/queue/queue.cons/deduct.pass.cpp b/libcxx/test/std/containers/container.adaptors/queue/queue.cons/deduct.pass.cpp
--- a/libcxx/test/std/containers/container.adaptors/queue/queue.cons/deduct.pass.cpp
+++ b/libcxx/test/std/containers/container.adaptors/queue/queue.cons/deduct.pass.cpp
@@ -8,9 +8,6 @@
 
 // <queue>
 // UNSUPPORTED: c++03, c++11, c++14
-// UNSUPPORTED: clang-5, apple-clang-9
-// Clang 5 will generate bad implicit deduction guides
-//  Specifically, for the copy constructor.
 
 // template<class Container>
 //   queue(Container) -> queue<typename Container::value_type, Container>;
diff --git a/libcxx/test/std/containers/container.adaptors/stack/stack.cons/deduct.pass.cpp b/libcxx/test/std/containers/container.adaptors/stack/stack.cons/deduct.pass.cpp
--- a/libcxx/test/std/containers/container.adaptors/stack/stack.cons/deduct.pass.cpp
+++ b/libcxx/test/std/containers/container.adaptors/stack/stack.cons/deduct.pass.cpp
@@ -8,9 +8,6 @@
 
 // <stack>
 // UNSUPPORTED: c++03, c++11, c++14
-// UNSUPPORTED: clang-5, apple-clang-9
-// Clang 5 will generate bad implicit deduction guides
-//	Specifically, for the copy constructor.
 
 // template<class Container>
 //   stack(Container) -> stack<typename Container::value_type, Container>;
diff --git a/libcxx/test/std/containers/sequences/array/array.cons/deduct.pass.cpp b/libcxx/test/std/containers/sequences/array/array.cons/deduct.pass.cpp
--- a/libcxx/test/std/containers/sequences/array/array.cons/deduct.pass.cpp
+++ b/libcxx/test/std/containers/sequences/array/array.cons/deduct.pass.cpp
@@ -8,9 +8,6 @@
 
 // <array>
 // UNSUPPORTED: c++03, c++11, c++14
-// UNSUPPORTED: clang-5, apple-clang-9
-// Clang 5 will generate bad implicit deduction guides
-//	Specifically, for the copy constructor.
 
 // template <class T, class... U>
 //   array(T, U...) -> array<T, 1 + sizeof...(U)>;
diff --git a/libcxx/test/std/containers/unord/unord.map/unord.map.cnstr/deduct.fail.cpp b/libcxx/test/std/containers/unord/unord.map/unord.map.cnstr/deduct.fail.cpp
--- a/libcxx/test/std/containers/unord/unord.map/unord.map.cnstr/deduct.fail.cpp
+++ b/libcxx/test/std/containers/unord/unord.map/unord.map.cnstr/deduct.fail.cpp
@@ -6,9 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
-// <unordered_map>
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: clang-6, apple-clang-9.0, apple-clang-9.1, apple-clang-10.0.0
+
+// <unordered_map>
 
 // template<class InputIterator,
 //          class Hash = hash<iter-key-type<InputIterator>>,
diff --git a/libcxx/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/deduct.fail.cpp b/libcxx/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/deduct.fail.cpp
--- a/libcxx/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/deduct.fail.cpp
+++ b/libcxx/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/deduct.fail.cpp
@@ -6,9 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
-// <unordered_map>
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: clang-6, apple-clang-9.0, apple-clang-9.1, apple-clang-10.0.0
+
+// <unordered_map>
 
 // template<class InputIterator,
 //          class Hash = hash<iter-key-type<InputIterator>>,
diff --git a/libcxx/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/deduct.fail.cpp b/libcxx/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/deduct.fail.cpp
--- a/libcxx/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/deduct.fail.cpp
+++ b/libcxx/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/deduct.fail.cpp
@@ -6,9 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
-// <unordered_set>
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: clang-6, apple-clang-9.0, apple-clang-9.1, apple-clang-10.0.0
+
+// <unordered_set>
 
 // template<class InputIterator,
 //        class Hash = hash<iter-value-type<InputIterator>>,
diff --git a/libcxx/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/deduct.pass.cpp b/libcxx/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/deduct.pass.cpp
--- a/libcxx/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/deduct.pass.cpp
+++ b/libcxx/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/deduct.pass.cpp
@@ -6,9 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
-// <unordered_set>
 // UNSUPPORTED: c++03, c++11, c++14
-// UNSUPPORTED: apple-clang-9.1
+
+// <unordered_set>
 
 // template<class InputIterator,
 //        class Hash = hash<iter-value-type<InputIterator>>,
diff --git a/libcxx/test/std/containers/unord/unord.set/unord.set.cnstr/deduct.fail.cpp b/libcxx/test/std/containers/unord/unord.set/unord.set.cnstr/deduct.fail.cpp
--- a/libcxx/test/std/containers/unord/unord.set/unord.set.cnstr/deduct.fail.cpp
+++ b/libcxx/test/std/containers/unord/unord.set/unord.set.cnstr/deduct.fail.cpp
@@ -6,9 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
-// <unordered_set>
 // UNSUPPORTED: c++03, c++11, c++14
-// XFAIL: clang-6, apple-clang-9.0, apple-clang-9.1, apple-clang-10.0.0
+
+// <unordered_set>
 
 // template<class InputIterator,
 //        class Hash = hash<iter-value-type<InputIterator>>,
diff --git a/libcxx/test/std/containers/unord/unord.set/unord.set.cnstr/deduct.pass.cpp b/libcxx/test/std/containers/unord/unord.set/unord.set.cnstr/deduct.pass.cpp
--- a/libcxx/test/std/containers/unord/unord.set/unord.set.cnstr/deduct.pass.cpp
+++ b/libcxx/test/std/containers/unord/unord.set/unord.set.cnstr/deduct.pass.cpp
@@ -6,9 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
-// <unordered_set>
 // UNSUPPORTED: c++03, c++11, c++14
-// UNSUPPORTED: apple-clang-9.1
+
+// <unordered_set>
 
 // template<class InputIterator,
 //        class Hash = hash<iter-value-type<InputIterator>>,
diff --git a/libcxx/test/std/depr/depr.c.headers/float_h.pass.cpp b/libcxx/test/std/depr/depr.c.headers/float_h.pass.cpp
--- a/libcxx/test/std/depr/depr.c.headers/float_h.pass.cpp
+++ b/libcxx/test/std/depr/depr.c.headers/float_h.pass.cpp
@@ -6,9 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// Before Clang 9.0, <float.h> does not define FLT_HAS_SUBNORM & friends in C++.
-// XFAIL: clang-4, clang-5, clang-6, clang-7, clang-8
-
 // test <float.h>
 
 #include <float.h>
diff --git a/libcxx/test/std/depr/depr.lib.binders/depr.lib.bind.1st/bind1st.depr_in_cxx11.verify.cpp b/libcxx/test/std/depr/depr.lib.binders/depr.lib.bind.1st/bind1st.depr_in_cxx11.verify.cpp
--- a/libcxx/test/std/depr/depr.lib.binders/depr.lib.bind.1st/bind1st.depr_in_cxx11.verify.cpp
+++ b/libcxx/test/std/depr/depr.lib.binders/depr.lib.bind.1st/bind1st.depr_in_cxx11.verify.cpp
@@ -10,7 +10,6 @@
 //
 // bind1st
 
-// UNSUPPORTED: clang-4.0
 // UNSUPPORTED: c++03
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_CXX17_REMOVED_BINDERS
 
diff --git a/libcxx/test/std/depr/depr.lib.binders/depr.lib.bind.2nd/bind2nd.depr_in_cxx11.verify.cpp b/libcxx/test/std/depr/depr.lib.binders/depr.lib.bind.2nd/bind2nd.depr_in_cxx11.verify.cpp
--- a/libcxx/test/std/depr/depr.lib.binders/depr.lib.bind.2nd/bind2nd.depr_in_cxx11.verify.cpp
+++ b/libcxx/test/std/depr/depr.lib.binders/depr.lib.bind.2nd/bind2nd.depr_in_cxx11.verify.cpp
@@ -10,7 +10,6 @@
 //
 // bind2nd
 
-// UNSUPPORTED: clang-4.0
 // UNSUPPORTED: c++03
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_CXX17_REMOVED_BINDERS
 
diff --git a/libcxx/test/std/depr/depr.lib.binders/depr.lib.binder.1st/binder1st.depr_in_cxx11.verify.cpp b/libcxx/test/std/depr/depr.lib.binders/depr.lib.binder.1st/binder1st.depr_in_cxx11.verify.cpp
--- a/libcxx/test/std/depr/depr.lib.binders/depr.lib.binder.1st/binder1st.depr_in_cxx11.verify.cpp
+++ b/libcxx/test/std/depr/depr.lib.binders/depr.lib.binder.1st/binder1st.depr_in_cxx11.verify.cpp
@@ -10,7 +10,6 @@
 //
 // binder1st
 
-// UNSUPPORTED: clang-4.0
 // UNSUPPORTED: c++03
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_CXX17_REMOVED_BINDERS
 
diff --git a/libcxx/test/std/depr/depr.lib.binders/depr.lib.binder.2nd/binder2nd.depr_in_cxx11.verify.cpp b/libcxx/test/std/depr/depr.lib.binders/depr.lib.binder.2nd/binder2nd.depr_in_cxx11.verify.cpp
--- a/libcxx/test/std/depr/depr.lib.binders/depr.lib.binder.2nd/binder2nd.depr_in_cxx11.verify.cpp
+++ b/libcxx/test/std/depr/depr.lib.binders/depr.lib.binder.2nd/binder2nd.depr_in_cxx11.verify.cpp
@@ -10,7 +10,6 @@
 //
 // binder2nd
 
-// UNSUPPORTED: clang-4.0
 // UNSUPPORTED: c++03
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_CXX17_REMOVED_BINDERS
 
diff --git a/libcxx/test/std/language.support/cmp/cmp.categories.pre/zero_type.verify.cpp b/libcxx/test/std/language.support/cmp/cmp.categories.pre/zero_type.verify.cpp
--- a/libcxx/test/std/language.support/cmp/cmp.categories.pre/zero_type.verify.cpp
+++ b/libcxx/test/std/language.support/cmp/cmp.categories.pre/zero_type.verify.cpp
@@ -8,11 +8,11 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: apple-clang-9, apple-clang-10, apple-clang-11, apple-clang-12.0.0
+// UNSUPPORTED: apple-clang-12
 
 // In MSVC mode, there's a slightly different number of errors printed for
 // each of these, so it doesn't add up to the exact expected count of 18.
-// UNSUPPORTED: msvc
+// XFAIL: msvc
 
 // <compare>
 
diff --git a/libcxx/test/std/language.support/cmp/cmp.partialord/partialord.pass.cpp b/libcxx/test/std/language.support/cmp/cmp.partialord/partialord.pass.cpp
--- a/libcxx/test/std/language.support/cmp/cmp.partialord/partialord.pass.cpp
+++ b/libcxx/test/std/language.support/cmp/cmp.partialord/partialord.pass.cpp
@@ -7,7 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: apple-clang-9, apple-clang-10, apple-clang-11, apple-clang-12.0.0
+// UNSUPPORTED: apple-clang-12
 
 // <compare>
 
diff --git a/libcxx/test/std/language.support/cmp/cmp.strongord/strongord.pass.cpp b/libcxx/test/std/language.support/cmp/cmp.strongord/strongord.pass.cpp
--- a/libcxx/test/std/language.support/cmp/cmp.strongord/strongord.pass.cpp
+++ b/libcxx/test/std/language.support/cmp/cmp.strongord/strongord.pass.cpp
@@ -7,7 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: apple-clang-9, apple-clang-10, apple-clang-11, apple-clang-12.0.0
+// UNSUPPORTED: apple-clang-12
 
 // <compare>
 
diff --git a/libcxx/test/std/language.support/cmp/cmp.weakord/weakord.pass.cpp b/libcxx/test/std/language.support/cmp/cmp.weakord/weakord.pass.cpp
--- a/libcxx/test/std/language.support/cmp/cmp.weakord/weakord.pass.cpp
+++ b/libcxx/test/std/language.support/cmp/cmp.weakord/weakord.pass.cpp
@@ -7,7 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: apple-clang-9, apple-clang-10, apple-clang-11, apple-clang-12.0.0
+// UNSUPPORTED: apple-clang-12
 
 // <compare>
 
diff --git a/libcxx/test/std/language.support/support.dynamic/destroying_delete_t.pass.cpp b/libcxx/test/std/language.support/support.dynamic/destroying_delete_t.pass.cpp
--- a/libcxx/test/std/language.support/support.dynamic/destroying_delete_t.pass.cpp
+++ b/libcxx/test/std/language.support/support.dynamic/destroying_delete_t.pass.cpp
@@ -14,9 +14,6 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
-// UNSUPPORTED: apple-clang-9, apple-clang-10
-// UNSUPPORTED: clang-6, clang-7
-
 #include <new>
 
 #include <cassert>
diff --git a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/delete_align_val_t_replace.pass.cpp b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/delete_align_val_t_replace.pass.cpp
--- a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/delete_align_val_t_replace.pass.cpp
+++ b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/delete_align_val_t_replace.pass.cpp
@@ -10,12 +10,6 @@
 
 // UNSUPPORTED: sanitizer-new-delete, c++03, c++11, c++14
 
-// Aligned allocation was not provided before macosx10.14 and as a result we
-// get availability errors when the deployment target is older than macosx10.14.
-// However, support for that was broken prior to Clang 8 and AppleClang 11.
-// UNSUPPORTED: apple-clang-9, apple-clang-10
-// UNSUPPORTED: clang-5, clang-6, clang-7
-
 // Libcxx when built for z/OS doesn't contain the aligned allocation functions,
 // nor does the dynamic library shipped with z/OS.
 // UNSUPPORTED: target={{.+}}-zos{{.*}}
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
@@ -13,9 +13,6 @@
 
 // Aligned allocation was not provided before macosx10.14 and as a result we
 // get availability errors when the deployment target is older than macosx10.14.
-// However, support for that was broken prior to Clang 8 and AppleClang 11.
-// UNSUPPORTED: apple-clang-9, apple-clang-10
-// UNSUPPORTED: clang-5, clang-6, clang-7
 // XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13}}
 
 // Libcxx when built for z/OS doesn't contain the aligned allocation functions,
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
@@ -13,9 +13,6 @@
 
 // Aligned allocation was not provided before macosx10.14 and as a result we
 // get availability errors when the deployment target is older than macosx10.14.
-// However, support for that was broken prior to Clang 8 and AppleClang 11.
-// UNSUPPORTED: apple-clang-9, apple-clang-10
-// UNSUPPORTED: clang-5, clang-6, clang-7
 // XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13}}
 
 // Libcxx when built for z/OS doesn't contain the aligned allocation functions,
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 +11,6 @@
 
 // Aligned allocation was not provided before macosx10.14 and as a result we
 // get availability errors when the deployment target is older than macosx10.14.
-// However, support for that was broken prior to Clang 8 and AppleClang 11.
-// UNSUPPORTED: apple-clang-9, apple-clang-10
-// UNSUPPORTED: clang-5, clang-6, clang-7
 // XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13}}
 
 // Libcxx when built for z/OS doesn't contain the aligned allocation functions,
diff --git a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array14.pass.cpp b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array14.pass.cpp
--- a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array14.pass.cpp
+++ b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array14.pass.cpp
@@ -12,8 +12,7 @@
 
 // NOTE: Clang does not enable sized-deallocation in C++14 and beyond by
 // default. It is only enabled when -fsized-deallocation is given.
-// (except clang-3.6 which temporarily enabled sized-deallocation)
-// UNSUPPORTED: clang, apple-clang
+// XFAIL: clang, apple-clang
 
 #include <new>
 #include <cstddef>
diff --git a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/delete_align_val_t_replace.pass.cpp b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/delete_align_val_t_replace.pass.cpp
--- a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/delete_align_val_t_replace.pass.cpp
+++ b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/delete_align_val_t_replace.pass.cpp
@@ -12,9 +12,6 @@
 
 // Aligned allocation was not provided before macosx10.14 and as a result we
 // get availability errors when the deployment target is older than macosx10.14.
-// However, support for that was broken prior to Clang 8 and AppleClang 11.
-// UNSUPPORTED: apple-clang-9, apple-clang-10
-// UNSUPPORTED: clang-5, clang-6, clang-7
 
 // 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
@@ -10,9 +10,6 @@
 
 // Aligned allocation was not provided before macosx10.14 and as a result we
 // get availability errors when the deployment target is older than macosx10.14.
-// However, support for that was broken prior to Clang 8 and AppleClang 11.
-// UNSUPPORTED: apple-clang-9, apple-clang-10
-// UNSUPPORTED: clang-5, clang-6, clang-7
 // XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13}}
 
 // asan and msan will not call the new handler.
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
@@ -10,9 +10,6 @@
 
 // Aligned allocation was not provided before macosx10.14 and as a result we
 // get availability errors when the deployment target is older than macosx10.14.
-// However, support for that was broken prior to Clang 8 and AppleClang 11.
-// UNSUPPORTED: apple-clang-9, apple-clang-10
-// UNSUPPORTED: clang-5, clang-6, clang-7
 // XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13}}
 
 // asan and msan will not call the new handler.
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 +11,6 @@
 
 // Aligned allocation was not provided before macosx10.14 and as a result we
 // get availability errors when the deployment target is older than macosx10.14.
-// However, support for that was broken prior to Clang 8 and AppleClang 11.
-// UNSUPPORTED: apple-clang-9, apple-clang-10
-// UNSUPPORTED: clang-5, clang-6, clang-7
 // XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13}}
 
 // Libcxx when built for z/OS doesn't contain the aligned allocation functions,
diff --git a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete14.pass.cpp b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete14.pass.cpp
--- a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete14.pass.cpp
+++ b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete14.pass.cpp
@@ -12,8 +12,7 @@
 
 // NOTE: Clang does not enable sized-deallocation in C++14 and beyond by
 // default. It is only enabled when -fsized-deallocation is given.
-// (except clang-3.6 which temporarily enabled sized-deallocation)
-// UNSUPPORTED: clang, apple-clang
+// XFAIL: clang, apple-clang
 
 #include <new>
 #include <cstddef>
diff --git a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete_fsizeddeallocation.pass.cpp b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete_fsizeddeallocation.pass.cpp
--- a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete_fsizeddeallocation.pass.cpp
+++ b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete_fsizeddeallocation.pass.cpp
@@ -14,7 +14,6 @@
 // UNSUPPORTED: sanitizer-new-delete
 // XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
 
-// NOTE: Only clang-3.7 and GCC 5.1 and greater support -fsized-deallocation.
 // REQUIRES: -fsized-deallocation
 // ADDITIONAL_COMPILE_FLAGS: -fsized-deallocation, -O3
 
diff --git a/libcxx/test/std/language.support/support.limits/c.limits/cfloat.pass.cpp b/libcxx/test/std/language.support/support.limits/c.limits/cfloat.pass.cpp
--- a/libcxx/test/std/language.support/support.limits/c.limits/cfloat.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/c.limits/cfloat.pass.cpp
@@ -6,9 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// Before Clang 9.0, <float.h> does not define FLT_HAS_SUBNORM & friends in C++.
-// XFAIL: clang-4, clang-5, clang-6, clang-7, clang-8
-
 // test <cfloat>
 
 #include <cfloat>
diff --git a/libcxx/test/std/numerics/numeric.ops/accumulate/accumulate.pass.cpp b/libcxx/test/std/numerics/numeric.ops/accumulate/accumulate.pass.cpp
--- a/libcxx/test/std/numerics/numeric.ops/accumulate/accumulate.pass.cpp
+++ b/libcxx/test/std/numerics/numeric.ops/accumulate/accumulate.pass.cpp
@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // <numeric>
-// UNSUPPORTED: clang-8
 
 // Became constexpr in C++20
 // template <InputIterator Iter, MoveConstructible T>
diff --git a/libcxx/test/std/numerics/numeric.ops/accumulate/accumulate_op.pass.cpp b/libcxx/test/std/numerics/numeric.ops/accumulate/accumulate_op.pass.cpp
--- a/libcxx/test/std/numerics/numeric.ops/accumulate/accumulate_op.pass.cpp
+++ b/libcxx/test/std/numerics/numeric.ops/accumulate/accumulate_op.pass.cpp
@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // <numeric>
-// UNSUPPORTED: clang-8
 
 // Became constexpr in C++20
 // template <InputIterator Iter, MoveConstructible T,
diff --git a/libcxx/test/std/numerics/numeric.ops/adjacent.difference/adjacent_difference.pass.cpp b/libcxx/test/std/numerics/numeric.ops/adjacent.difference/adjacent_difference.pass.cpp
--- a/libcxx/test/std/numerics/numeric.ops/adjacent.difference/adjacent_difference.pass.cpp
+++ b/libcxx/test/std/numerics/numeric.ops/adjacent.difference/adjacent_difference.pass.cpp
@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // <numeric>
-// UNSUPPORTED: clang-8
 
 // Became constexpr in C++20
 // template <InputIterator InIter,
diff --git a/libcxx/test/std/numerics/numeric.ops/adjacent.difference/adjacent_difference_op.pass.cpp b/libcxx/test/std/numerics/numeric.ops/adjacent.difference/adjacent_difference_op.pass.cpp
--- a/libcxx/test/std/numerics/numeric.ops/adjacent.difference/adjacent_difference_op.pass.cpp
+++ b/libcxx/test/std/numerics/numeric.ops/adjacent.difference/adjacent_difference_op.pass.cpp
@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // <numeric>
-// UNSUPPORTED: clang-8
 
 // Became constexpr in C++20
 // template <InputIterator InIter,
diff --git a/libcxx/test/std/numerics/numeric.ops/exclusive.scan/exclusive_scan.pass.cpp b/libcxx/test/std/numerics/numeric.ops/exclusive.scan/exclusive_scan.pass.cpp
--- a/libcxx/test/std/numerics/numeric.ops/exclusive.scan/exclusive_scan.pass.cpp
+++ b/libcxx/test/std/numerics/numeric.ops/exclusive.scan/exclusive_scan.pass.cpp
@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// UNSUPPORTED: clang-8
 
 // <numeric>
 
diff --git a/libcxx/test/std/numerics/numeric.ops/exclusive.scan/exclusive_scan_init_op.pass.cpp b/libcxx/test/std/numerics/numeric.ops/exclusive.scan/exclusive_scan_init_op.pass.cpp
--- a/libcxx/test/std/numerics/numeric.ops/exclusive.scan/exclusive_scan_init_op.pass.cpp
+++ b/libcxx/test/std/numerics/numeric.ops/exclusive.scan/exclusive_scan_init_op.pass.cpp
@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// UNSUPPORTED: clang-8
 
 // <numeric>
 
diff --git a/libcxx/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan.pass.cpp b/libcxx/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan.pass.cpp
--- a/libcxx/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan.pass.cpp
+++ b/libcxx/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan.pass.cpp
@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// UNSUPPORTED: clang-8
 
 // <numeric>
 
diff --git a/libcxx/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op.pass.cpp b/libcxx/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op.pass.cpp
--- a/libcxx/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op.pass.cpp
+++ b/libcxx/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op.pass.cpp
@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// UNSUPPORTED: clang-8
 
 // <numeric>
 
diff --git a/libcxx/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op_init.pass.cpp b/libcxx/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op_init.pass.cpp
--- a/libcxx/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op_init.pass.cpp
+++ b/libcxx/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op_init.pass.cpp
@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// UNSUPPORTED: clang-8
 
 // <numeric>
 
diff --git a/libcxx/test/std/numerics/numeric.ops/inner.product/inner_product.pass.cpp b/libcxx/test/std/numerics/numeric.ops/inner.product/inner_product.pass.cpp
--- a/libcxx/test/std/numerics/numeric.ops/inner.product/inner_product.pass.cpp
+++ b/libcxx/test/std/numerics/numeric.ops/inner.product/inner_product.pass.cpp
@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // <numeric>
-// UNSUPPORTED: clang-8
 
 // Became constexpr in C++20
 // template <InputIterator Iter1, InputIterator Iter2, MoveConstructible T>
diff --git a/libcxx/test/std/numerics/numeric.ops/inner.product/inner_product_comp.pass.cpp b/libcxx/test/std/numerics/numeric.ops/inner.product/inner_product_comp.pass.cpp
--- a/libcxx/test/std/numerics/numeric.ops/inner.product/inner_product_comp.pass.cpp
+++ b/libcxx/test/std/numerics/numeric.ops/inner.product/inner_product_comp.pass.cpp
@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // <numeric>
-// UNSUPPORTED: clang-8
 
 // Became constexpr in C++20
 // template <InputIterator Iter1, InputIterator Iter2, MoveConstructible T,
diff --git a/libcxx/test/std/numerics/numeric.ops/numeric.iota/iota.pass.cpp b/libcxx/test/std/numerics/numeric.ops/numeric.iota/iota.pass.cpp
--- a/libcxx/test/std/numerics/numeric.ops/numeric.iota/iota.pass.cpp
+++ b/libcxx/test/std/numerics/numeric.ops/numeric.iota/iota.pass.cpp
@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // <numeric>
-// UNSUPPORTED: clang-8
 
 // Became constexpr in C++20
 // template <class ForwardIterator, class T>
diff --git a/libcxx/test/std/numerics/numeric.ops/partial.sum/partial_sum.pass.cpp b/libcxx/test/std/numerics/numeric.ops/partial.sum/partial_sum.pass.cpp
--- a/libcxx/test/std/numerics/numeric.ops/partial.sum/partial_sum.pass.cpp
+++ b/libcxx/test/std/numerics/numeric.ops/partial.sum/partial_sum.pass.cpp
@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // <numeric>
-// UNSUPPORTED: clang-8
 
 // Became constexpr in C++20
 // template <InputIterator InIter, OutputIterator<auto, const InIter::value_type&> OutIter>
diff --git a/libcxx/test/std/numerics/numeric.ops/partial.sum/partial_sum_op.pass.cpp b/libcxx/test/std/numerics/numeric.ops/partial.sum/partial_sum_op.pass.cpp
--- a/libcxx/test/std/numerics/numeric.ops/partial.sum/partial_sum_op.pass.cpp
+++ b/libcxx/test/std/numerics/numeric.ops/partial.sum/partial_sum_op.pass.cpp
@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // <numeric>
-// UNSUPPORTED: clang-8
 
 // Became constexpr in C++20
 // template<InputIterator InIter,
diff --git a/libcxx/test/std/numerics/numeric.ops/reduce/reduce.pass.cpp b/libcxx/test/std/numerics/numeric.ops/reduce/reduce.pass.cpp
--- a/libcxx/test/std/numerics/numeric.ops/reduce/reduce.pass.cpp
+++ b/libcxx/test/std/numerics/numeric.ops/reduce/reduce.pass.cpp
@@ -6,9 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
-// <numeric>
 // UNSUPPORTED: c++03, c++11, c++14
-// UNSUPPORTED: clang-8
+
+// <numeric>
 
 // Became constexpr in C++20
 // template<class InputIterator>
diff --git a/libcxx/test/std/numerics/numeric.ops/reduce/reduce_init.pass.cpp b/libcxx/test/std/numerics/numeric.ops/reduce/reduce_init.pass.cpp
--- a/libcxx/test/std/numerics/numeric.ops/reduce/reduce_init.pass.cpp
+++ b/libcxx/test/std/numerics/numeric.ops/reduce/reduce_init.pass.cpp
@@ -6,9 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
-// <numeric>
 // UNSUPPORTED: c++03, c++11, c++14
-// UNSUPPORTED: clang-8
+
+// <numeric>
 
 // Became constexpr in C++20
 // template<class InputIterator, class T>
diff --git a/libcxx/test/std/numerics/numeric.ops/reduce/reduce_init_op.pass.cpp b/libcxx/test/std/numerics/numeric.ops/reduce/reduce_init_op.pass.cpp
--- a/libcxx/test/std/numerics/numeric.ops/reduce/reduce_init_op.pass.cpp
+++ b/libcxx/test/std/numerics/numeric.ops/reduce/reduce_init_op.pass.cpp
@@ -6,9 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
-// <numeric>
 // UNSUPPORTED: c++03, c++11, c++14
-// UNSUPPORTED: clang-8
+
+// <numeric>
 
 // Became constexpr in C++20
 // template<class InputIterator, class T, class BinaryOperation>
diff --git a/libcxx/test/std/numerics/numeric.ops/transform.exclusive.scan/transform_exclusive_scan_init_bop_uop.pass.cpp b/libcxx/test/std/numerics/numeric.ops/transform.exclusive.scan/transform_exclusive_scan_init_bop_uop.pass.cpp
--- a/libcxx/test/std/numerics/numeric.ops/transform.exclusive.scan/transform_exclusive_scan_init_bop_uop.pass.cpp
+++ b/libcxx/test/std/numerics/numeric.ops/transform.exclusive.scan/transform_exclusive_scan_init_bop_uop.pass.cpp
@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// UNSUPPORTED: clang-8
 
 // <numeric>
 
diff --git a/libcxx/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop.pass.cpp b/libcxx/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop.pass.cpp
--- a/libcxx/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop.pass.cpp
+++ b/libcxx/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop.pass.cpp
@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// UNSUPPORTED: clang-8
 
 // <numeric>
 
diff --git a/libcxx/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop_init.pass.cpp b/libcxx/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop_init.pass.cpp
--- a/libcxx/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop_init.pass.cpp
+++ b/libcxx/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop_init.pass.cpp
@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// UNSUPPORTED: clang-8
 
 // <numeric>
 
diff --git a/libcxx/test/std/numerics/numeric.ops/transform.reduce/transform_reduce_iter_iter_init_bop_uop.pass.cpp b/libcxx/test/std/numerics/numeric.ops/transform.reduce/transform_reduce_iter_iter_init_bop_uop.pass.cpp
--- a/libcxx/test/std/numerics/numeric.ops/transform.reduce/transform_reduce_iter_iter_init_bop_uop.pass.cpp
+++ b/libcxx/test/std/numerics/numeric.ops/transform.reduce/transform_reduce_iter_iter_init_bop_uop.pass.cpp
@@ -6,9 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
-// <numeric>
 // UNSUPPORTED: c++03, c++11, c++14
-// UNSUPPORTED: clang-8
+
+// <numeric>
 
 // Became constexpr in C++20
 // template <class InputIterator1, class T,
diff --git a/libcxx/test/std/numerics/numeric.ops/transform.reduce/transform_reduce_iter_iter_iter_init.pass.cpp b/libcxx/test/std/numerics/numeric.ops/transform.reduce/transform_reduce_iter_iter_iter_init.pass.cpp
--- a/libcxx/test/std/numerics/numeric.ops/transform.reduce/transform_reduce_iter_iter_iter_init.pass.cpp
+++ b/libcxx/test/std/numerics/numeric.ops/transform.reduce/transform_reduce_iter_iter_iter_init.pass.cpp
@@ -6,9 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
-// <numeric>
 // UNSUPPORTED: c++03, c++11, c++14
-// UNSUPPORTED: clang-8
+
+// <numeric>
 
 // Became constexpr in C++20
 // template <class InputIterator1, class InputIterator2, class T>
diff --git a/libcxx/test/std/numerics/numeric.ops/transform.reduce/transform_reduce_iter_iter_iter_init_op_op.pass.cpp b/libcxx/test/std/numerics/numeric.ops/transform.reduce/transform_reduce_iter_iter_iter_init_op_op.pass.cpp
--- a/libcxx/test/std/numerics/numeric.ops/transform.reduce/transform_reduce_iter_iter_iter_init_op_op.pass.cpp
+++ b/libcxx/test/std/numerics/numeric.ops/transform.reduce/transform_reduce_iter_iter_iter_init_op_op.pass.cpp
@@ -6,9 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
-// <numeric>
 // UNSUPPORTED: c++03, c++11, c++14
-// UNSUPPORTED: clang-8
+
+// <numeric>
 
 // Became constexpr in C++20
 // template <class InputIterator1, class InputIterator2, class T,
diff --git a/libcxx/test/std/ranges/range.access/range.access.begin/incomplete.compile.verify.cpp b/libcxx/test/std/ranges/range.access/range.access.begin/incomplete.compile.verify.cpp
--- a/libcxx/test/std/ranges/range.access/range.access.begin/incomplete.compile.verify.cpp
+++ b/libcxx/test/std/ranges/range.access/range.access.begin/incomplete.compile.verify.cpp
@@ -8,7 +8,6 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-no-concepts
-// UNSUPPORTED: clang-10
 // UNSUPPORTED: libcpp-has-no-incomplete-ranges
 
 // unspecified begin;
@@ -19,11 +18,9 @@
 
 using begin_t = decltype(std::ranges::begin);
 
-// clang-format off
 template <class T>
 requires(!std::invocable<begin_t&, T>)
 void f() {}
-// clang-format on
 
 void test() {
   struct incomplete;
diff --git a/libcxx/test/std/ranges/range.access/range.access.cbegin/incomplete.compile.verify.cpp b/libcxx/test/std/ranges/range.access/range.access.cbegin/incomplete.compile.verify.cpp
--- a/libcxx/test/std/ranges/range.access/range.access.cbegin/incomplete.compile.verify.cpp
+++ b/libcxx/test/std/ranges/range.access/range.access.cbegin/incomplete.compile.verify.cpp
@@ -8,7 +8,6 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-no-concepts
-// UNSUPPORTED: clang-10
 // UNSUPPORTED: libcpp-has-no-incomplete-ranges
 
 // ranges::cbegin;
@@ -19,11 +18,9 @@
 
 using cbegin_t = decltype(std::ranges::cbegin);
 
-// clang-format off
 template <class T>
 requires(!std::invocable<cbegin_t&, T>)
 void f() {}
-// clang-format on
 
 void test() {
   struct incomplete;
diff --git a/libcxx/test/std/ranges/range.access/range.access.cend/incomplete.compile.verify.cpp b/libcxx/test/std/ranges/range.access/range.access.cend/incomplete.compile.verify.cpp
--- a/libcxx/test/std/ranges/range.access/range.access.cend/incomplete.compile.verify.cpp
+++ b/libcxx/test/std/ranges/range.access/range.access.cend/incomplete.compile.verify.cpp
@@ -8,7 +8,6 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-no-concepts
-// UNSUPPORTED: clang-10
 // UNSUPPORTED: libcpp-has-no-incomplete-ranges
 
 // unspecified begin;
@@ -19,11 +18,9 @@
 
 using cend_t = decltype(std::ranges::cend);
 
-// clang-format off
 template <class T>
 requires(!std::invocable<cend_t&, T>)
 void f() {}
-// clang-format on
 
 void test() {
   struct incomplete;
diff --git a/libcxx/test/std/ranges/range.access/range.access.end/incomplete.compile.verify.cpp b/libcxx/test/std/ranges/range.access/range.access.end/incomplete.compile.verify.cpp
--- a/libcxx/test/std/ranges/range.access/range.access.end/incomplete.compile.verify.cpp
+++ b/libcxx/test/std/ranges/range.access/range.access.end/incomplete.compile.verify.cpp
@@ -8,7 +8,6 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-no-concepts
-// UNSUPPORTED: clang-10
 // UNSUPPORTED: libcpp-has-no-incomplete-ranges
 
 // unspecified begin;
@@ -19,11 +18,9 @@
 
 using end_t = decltype(std::ranges::end);
 
-// clang-format off
 template <class T>
 requires(!std::invocable<end_t&, T>)
 void f() {}
-// clang-format on
 
 void test() {
   struct incomplete;
diff --git a/libcxx/test/std/ranges/range.access/range.prim/data.incomplete.verify.cpp b/libcxx/test/std/ranges/range.access/range.prim/data.incomplete.verify.cpp
--- a/libcxx/test/std/ranges/range.access/range.prim/data.incomplete.verify.cpp
+++ b/libcxx/test/std/ranges/range.access/range.prim/data.incomplete.verify.cpp
@@ -8,7 +8,6 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-no-concepts
-// UNSUPPORTED: clang-10
 // UNSUPPORTED: libcpp-has-no-incomplete-ranges
 
 // std::ranges::data
diff --git a/libcxx/test/std/ranges/range.access/range.prim/empty.incomplete.verify.cpp b/libcxx/test/std/ranges/range.access/range.prim/empty.incomplete.verify.cpp
--- a/libcxx/test/std/ranges/range.access/range.prim/empty.incomplete.verify.cpp
+++ b/libcxx/test/std/ranges/range.access/range.prim/empty.incomplete.verify.cpp
@@ -8,7 +8,6 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-no-concepts
-// UNSUPPORTED: clang-10
 // UNSUPPORTED: libcpp-has-no-incomplete-ranges
 
 // std::ranges::empty
diff --git a/libcxx/test/std/strings/basic.string/string.cons/iter_alloc_deduction.fail.cpp b/libcxx/test/std/strings/basic.string/string.cons/iter_alloc_deduction.fail.cpp
--- a/libcxx/test/std/strings/basic.string/string.cons/iter_alloc_deduction.fail.cpp
+++ b/libcxx/test/std/strings/basic.string/string.cons/iter_alloc_deduction.fail.cpp
@@ -8,8 +8,6 @@
 
 // <string>
 // UNSUPPORTED: c++03, c++11, c++14
-// UNSUPPORTED: clang-4.0
-// UNSUPPORTED: apple-clang-9
 
 // template<class InputIterator,
 //      class Allocator = allocator<typename iterator_traits<InputIterator>::value_type>>
diff --git a/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/assign3.pass.cpp b/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/assign3.pass.cpp
--- a/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/assign3.pass.cpp
+++ b/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/assign3.pass.cpp
@@ -6,8 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: clang-8
-
 // <string>
 
 // template<> struct char_traits<char>
diff --git a/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/copy.pass.cpp b/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/copy.pass.cpp
--- a/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/copy.pass.cpp
+++ b/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/copy.pass.cpp
@@ -6,7 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: clang-8
 // UNSUPPORTED: LIBCXX-DEBUG-FIXME
 
 // <string>
diff --git a/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/move.pass.cpp b/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/move.pass.cpp
--- a/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/move.pass.cpp
+++ b/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/move.pass.cpp
@@ -6,8 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: clang-8
-
 // <string>
 
 // template<> struct char_traits<char>
diff --git a/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/assign3.pass.cpp b/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/assign3.pass.cpp
--- a/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/assign3.pass.cpp
+++ b/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/assign3.pass.cpp
@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: clang-8
 
 // <string>
 
diff --git a/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/copy.pass.cpp b/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/copy.pass.cpp
--- a/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/copy.pass.cpp
+++ b/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/copy.pass.cpp
@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: clang-8
 // UNSUPPORTED: LIBCXX-DEBUG-FIXME
 
 // <string>
diff --git a/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/move.pass.cpp b/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/move.pass.cpp
--- a/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/move.pass.cpp
+++ b/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/move.pass.cpp
@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: clang-8
 
 // <string>
 
diff --git a/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/assign3.pass.cpp b/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/assign3.pass.cpp
--- a/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/assign3.pass.cpp
+++ b/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/assign3.pass.cpp
@@ -6,8 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: clang-8
-
 // <string>
 
 // template<> struct char_traits<wchar_t>
diff --git a/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/copy.pass.cpp b/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/copy.pass.cpp
--- a/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/copy.pass.cpp
+++ b/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/copy.pass.cpp
@@ -6,7 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: clang-8
 // UNSUPPORTED: LIBCXX-DEBUG-FIXME
 
 // <string>
diff --git a/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/move.pass.cpp b/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/move.pass.cpp
--- a/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/move.pass.cpp
+++ b/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/move.pass.cpp
@@ -6,8 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: clang-8
-
 // <string>
 
 // template<> struct char_traits<wchar_t>
diff --git a/libcxx/test/std/utilities/function.objects/negators/binary_negate.depr_in_cxx17.verify.cpp b/libcxx/test/std/utilities/function.objects/negators/binary_negate.depr_in_cxx17.verify.cpp
--- a/libcxx/test/std/utilities/function.objects/negators/binary_negate.depr_in_cxx17.verify.cpp
+++ b/libcxx/test/std/utilities/function.objects/negators/binary_negate.depr_in_cxx17.verify.cpp
@@ -11,7 +11,6 @@
 // binary_negate
 //  deprecated in C++17
 
-// UNSUPPORTED: clang-4.0
 // UNSUPPORTED: c++03, c++11, c++14
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_CXX20_REMOVED_NEGATORS
 
diff --git a/libcxx/test/std/utilities/function.objects/negators/not1.depr_in_cxx17.verify.cpp b/libcxx/test/std/utilities/function.objects/negators/not1.depr_in_cxx17.verify.cpp
--- a/libcxx/test/std/utilities/function.objects/negators/not1.depr_in_cxx17.verify.cpp
+++ b/libcxx/test/std/utilities/function.objects/negators/not1.depr_in_cxx17.verify.cpp
@@ -11,7 +11,6 @@
 // not1
 //  deprecated in C++17
 
-// UNSUPPORTED: clang-4.0
 // UNSUPPORTED: c++03, c++11, c++14
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_CXX20_REMOVED_NEGATORS
 
diff --git a/libcxx/test/std/utilities/function.objects/negators/not2.depr_in_cxx17.verify.cpp b/libcxx/test/std/utilities/function.objects/negators/not2.depr_in_cxx17.verify.cpp
--- a/libcxx/test/std/utilities/function.objects/negators/not2.depr_in_cxx17.verify.cpp
+++ b/libcxx/test/std/utilities/function.objects/negators/not2.depr_in_cxx17.verify.cpp
@@ -11,7 +11,6 @@
 // not2
 //  deprecated in C++17
 
-// UNSUPPORTED: clang-4.0
 // UNSUPPORTED: c++03, c++11, c++14
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_CXX20_REMOVED_NEGATORS
 
diff --git a/libcxx/test/std/utilities/function.objects/negators/unary_negate.depr_in_cxx17.verify.cpp b/libcxx/test/std/utilities/function.objects/negators/unary_negate.depr_in_cxx17.verify.cpp
--- a/libcxx/test/std/utilities/function.objects/negators/unary_negate.depr_in_cxx17.verify.cpp
+++ b/libcxx/test/std/utilities/function.objects/negators/unary_negate.depr_in_cxx17.verify.cpp
@@ -11,7 +11,6 @@
 // unary_negate
 //  deprecated in C++17
 
-// UNSUPPORTED: clang-4.0
 // UNSUPPORTED: c++03, c++11, c++14
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_CXX20_REMOVED_NEGATORS
 
diff --git a/libcxx/test/std/utilities/memory/allocator.traits/allocator.traits.members/allocate_hint.pass.cpp b/libcxx/test/std/utilities/memory/allocator.traits/allocator.traits.members/allocate_hint.pass.cpp
--- a/libcxx/test/std/utilities/memory/allocator.traits/allocator.traits.members/allocate_hint.pass.cpp
+++ b/libcxx/test/std/utilities/memory/allocator.traits/allocator.traits.members/allocate_hint.pass.cpp
@@ -6,8 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: clang-8
-
 // <memory>
 
 // template <class Alloc>
diff --git a/libcxx/test/std/utilities/memory/allocator.traits/allocator.traits.members/construct.pass.cpp b/libcxx/test/std/utilities/memory/allocator.traits/allocator.traits.members/construct.pass.cpp
--- a/libcxx/test/std/utilities/memory/allocator.traits/allocator.traits.members/construct.pass.cpp
+++ b/libcxx/test/std/utilities/memory/allocator.traits/allocator.traits.members/construct.pass.cpp
@@ -6,8 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: clang-8
-
 // <memory>
 
 // template <class Alloc>
diff --git a/libcxx/test/std/utilities/memory/allocator.traits/allocator.traits.members/destroy.pass.cpp b/libcxx/test/std/utilities/memory/allocator.traits/allocator.traits.members/destroy.pass.cpp
--- a/libcxx/test/std/utilities/memory/allocator.traits/allocator.traits.members/destroy.pass.cpp
+++ b/libcxx/test/std/utilities/memory/allocator.traits/allocator.traits.members/destroy.pass.cpp
@@ -6,8 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: clang-8
-
 // <memory>
 
 // template <class Alloc>
diff --git a/libcxx/test/std/utilities/memory/default.allocator/allocator.members/allocate.pass.cpp b/libcxx/test/std/utilities/memory/default.allocator/allocator.members/allocate.pass.cpp
--- a/libcxx/test/std/utilities/memory/default.allocator/allocator.members/allocate.pass.cpp
+++ b/libcxx/test/std/utilities/memory/default.allocator/allocator.members/allocate.pass.cpp
@@ -6,8 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: clang-8
-
 // <memory>
 
 // allocator:
diff --git a/libcxx/test/std/utilities/memory/default.allocator/allocator_types.deprecated_in_cxx17.verify.cpp b/libcxx/test/std/utilities/memory/default.allocator/allocator_types.deprecated_in_cxx17.verify.cpp
--- a/libcxx/test/std/utilities/memory/default.allocator/allocator_types.deprecated_in_cxx17.verify.cpp
+++ b/libcxx/test/std/utilities/memory/default.allocator/allocator_types.deprecated_in_cxx17.verify.cpp
@@ -25,10 +25,6 @@
 
 // REQUIRES: c++17
 
-// Clang 6 does not handle the deprecated attribute on template members properly,
-// so the rebind<int> check below fails.
-// UNSUPPORTED: clang-6
-
 #include <memory>
 
 int main(int, char**) {
diff --git a/libcxx/test/std/utilities/memory/specialized.algorithms/specialized.construct/construct_at.pass.cpp b/libcxx/test/std/utilities/memory/specialized.algorithms/specialized.construct/construct_at.pass.cpp
--- a/libcxx/test/std/utilities/memory/specialized.algorithms/specialized.construct/construct_at.pass.cpp
+++ b/libcxx/test/std/utilities/memory/specialized.algorithms/specialized.construct/construct_at.pass.cpp
@@ -7,11 +7,9 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// constexpr destructors are only supported starting with clang 10
-// UNSUPPORTED: clang-5, clang-6, clang-7, clang-8, clang-9
 
 // Investigation needed
-// UNSUPPORTED: gcc
+// XFAIL: gcc
 
 // <memory>
 
diff --git a/libcxx/test/std/utilities/memory/specialized.algorithms/specialized.destroy/destroy.pass.cpp b/libcxx/test/std/utilities/memory/specialized.algorithms/specialized.destroy/destroy.pass.cpp
--- a/libcxx/test/std/utilities/memory/specialized.algorithms/specialized.destroy/destroy.pass.cpp
+++ b/libcxx/test/std/utilities/memory/specialized.algorithms/specialized.destroy/destroy.pass.cpp
@@ -7,8 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// constexpr destructors are only supported starting with clang 10
-// UNSUPPORTED: clang-5, clang-6, clang-7, clang-8, clang-9
 
 // <memory>
 
diff --git a/libcxx/test/std/utilities/memory/specialized.algorithms/specialized.destroy/destroy_at.pass.cpp b/libcxx/test/std/utilities/memory/specialized.algorithms/specialized.destroy/destroy_at.pass.cpp
--- a/libcxx/test/std/utilities/memory/specialized.algorithms/specialized.destroy/destroy_at.pass.cpp
+++ b/libcxx/test/std/utilities/memory/specialized.algorithms/specialized.destroy/destroy_at.pass.cpp
@@ -7,8 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// constexpr destructors are only supported starting with clang 10
-// UNSUPPORTED: clang-5, clang-6, clang-7, clang-8, clang-9
 
 // <memory>
 
diff --git a/libcxx/test/std/utilities/memory/specialized.algorithms/specialized.destroy/destroy_n.pass.cpp b/libcxx/test/std/utilities/memory/specialized.algorithms/specialized.destroy/destroy_n.pass.cpp
--- a/libcxx/test/std/utilities/memory/specialized.algorithms/specialized.destroy/destroy_n.pass.cpp
+++ b/libcxx/test/std/utilities/memory/specialized.algorithms/specialized.destroy/destroy_n.pass.cpp
@@ -7,8 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// constexpr destructors are only supported starting with clang 10
-// UNSUPPORTED: clang-5, clang-6, clang-7, clang-8, clang-9
 
 // <memory>
 
diff --git a/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/op_arrow.fail.cpp b/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/op_arrow.fail.cpp
--- a/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/op_arrow.fail.cpp
+++ b/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/op_arrow.fail.cpp
@@ -10,9 +10,6 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Clang doesn't support filename wildcards in verify tests until 05eedf1f5b44.
-// UNSUPPORTED: clang-10
-
 // shared_ptr
 
 // element_type& operator[](ptrdiff_t i) const;
diff --git a/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/op_bracket.fail.cpp b/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/op_bracket.fail.cpp
--- a/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/op_bracket.fail.cpp
+++ b/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/op_bracket.fail.cpp
@@ -10,9 +10,6 @@
 
 // UNSUPPORTED: c++03, c++11, c++14
 
-// Clang doesn't support filename wildcards in verify tests until 05eedf1f5b44.
-// UNSUPPORTED: clang-10
-
 // shared_ptr
 
 // element_type& operator[](ptrdiff_t i) const;
diff --git a/libcxx/test/std/utilities/meta/meta.rel/is_base_of_union.pass.cpp b/libcxx/test/std/utilities/meta/meta.rel/is_base_of_union.pass.cpp
--- a/libcxx/test/std/utilities/meta/meta.rel/is_base_of_union.pass.cpp
+++ b/libcxx/test/std/utilities/meta/meta.rel/is_base_of_union.pass.cpp
@@ -14,13 +14,6 @@
 
 #include "test_macros.h"
 
-//  Clang before v9 and apple-clang up to and including v11 do not
-//  report that unions are never base classes - nor can they have bases.
-//  See https://reviews.llvm.org/D61858
-// XFAIL: apple-clang-9.0, apple-clang-9.1, apple-clang-10.0, apple-clang-11.0.0
-// XFAIL: clang-4.0, clang-5.0, clang-6.0, clang-7.0, clang-8.0
-
-
 template <class T, class U>
 void test_is_base_of()
 {
diff --git a/libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/has_unique_object_representations.pass.cpp b/libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/has_unique_object_representations.pass.cpp
--- a/libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/has_unique_object_representations.pass.cpp
+++ b/libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/has_unique_object_representations.pass.cpp
@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// UNSUPPORTED: clang-4, clang-5, apple-clang
 
 // type_traits
 
diff --git a/libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_copyable.pass.cpp b/libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_copyable.pass.cpp
--- a/libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_copyable.pass.cpp
+++ b/libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_copyable.pass.cpp
@@ -10,9 +10,9 @@
 
 // is_trivially_copyable
 
-// These compilers have not implemented Core 2094 which makes volatile
+// GCC has not implemented Core 2094 which makes volatile
 // qualified types trivially copyable.
-// XFAIL: clang-4, apple-clang-9.0, gcc
+// XFAIL: gcc
 
 #include <type_traits>
 #include <cassert>
diff --git a/libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_destructible.pass.cpp b/libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_destructible.pass.cpp
--- a/libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_destructible.pass.cpp
+++ b/libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_destructible.pass.cpp
@@ -5,7 +5,6 @@
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
-// UNSUPPORTED: apple-clang-9
 
 // type_traits
 
diff --git a/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/deduct.fail.cpp b/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/deduct.fail.cpp
--- a/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/deduct.fail.cpp
+++ b/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/deduct.fail.cpp
@@ -6,11 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
-// <optional>
 // UNSUPPORTED: c++03, c++11, c++14
-// UNSUPPORTED: clang-5
-// Clang 5 will generate bad implicit deduction guides
-//  Specifically, for the copy constructor.
+
+// <optional>
 
 // template<class T>
 //   optional(T) -> optional<T>;
@@ -27,12 +25,7 @@
 //  Test the implicit deduction guides
     {
 //  optional()
-    std::optional opt;   // expected-error-re {{{{declaration of variable 'opt' with deduced type 'std::optional' requires an initializer|no viable constructor or deduction guide for deduction of template arguments of 'optional'}}}}
-//  clang-6 gives a bogus error here:
-//      declaration of variable 'opt' with deduced type 'std::optional' requires an initializer
-//  clang-7 (and later) give a better message:
-//      no viable constructor or deduction guide for deduction of template arguments of 'optional'
-//  So we check for one or the other.
+    std::optional opt;   // expected-error {{no viable constructor or deduction guide for deduction of template arguments of 'optional'}}
     }
 
     {
diff --git a/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/deduct.pass.cpp b/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/deduct.pass.cpp
--- a/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/deduct.pass.cpp
+++ b/libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/deduct.pass.cpp
@@ -8,9 +8,6 @@
 
 // <optional>
 // UNSUPPORTED: c++03, c++11, c++14
-// UNSUPPORTED: clang-5, apple-clang-9
-// Clang 5 will generate bad implicit deduction guides
-//  Specifically, for the copy constructor.
 
 // template<class T>
 //   optional(T) -> optional<T>;
diff --git a/libcxx/test/std/utilities/time/time.hms/hhmmss.fail.cpp b/libcxx/test/std/utilities/time/time.hms/hhmmss.fail.cpp
--- a/libcxx/test/std/utilities/time/time.hms/hhmmss.fail.cpp
+++ b/libcxx/test/std/utilities/time/time.hms/hhmmss.fail.cpp
@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: apple-clang-9
+
 // <chrono>
 
 // template <class Duration> class hh_mm_ss;
diff --git a/libcxx/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/literals.fail.cpp b/libcxx/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/literals.fail.cpp
--- a/libcxx/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/literals.fail.cpp
+++ b/libcxx/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/literals.fail.cpp
@@ -6,8 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: clang-5, clang-6
-// UNSUPPORTED: apple-clang-9, apple-clang-10
 
 // <chrono>
 // class day;
diff --git a/libcxx/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/literals.pass.cpp b/libcxx/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/literals.pass.cpp
--- a/libcxx/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/literals.pass.cpp
+++ b/libcxx/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/literals.pass.cpp
@@ -6,8 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: clang-5, clang-6, clang-7
-// UNSUPPORTED: apple-clang-9, apple-clang-10
 
 // <chrono>
 // class day;
diff --git a/libcxx/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/literals.fail.cpp b/libcxx/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/literals.fail.cpp
--- a/libcxx/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/literals.fail.cpp
+++ b/libcxx/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/literals.fail.cpp
@@ -6,8 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: clang-5, clang-6
-// UNSUPPORTED: apple-clang-9, apple-clang-10
 
 // <chrono>
 // class year;
diff --git a/libcxx/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/literals.pass.cpp b/libcxx/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/literals.pass.cpp
--- a/libcxx/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/literals.pass.cpp
+++ b/libcxx/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/literals.pass.cpp
@@ -6,8 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++03, c++11, c++14, c++17
-// UNSUPPORTED: clang-5, clang-6, clang-7
-// UNSUPPORTED: apple-clang-9, apple-clang-10
 
 // <chrono>
 // class year;
diff --git a/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/deduct.pass.cpp b/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/deduct.pass.cpp
--- a/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/deduct.pass.cpp
+++ b/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/deduct.pass.cpp
@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// UNSUPPORTED: apple-clang-9
 
 // GCC's implementation of class template deduction is still immature and runs
 // into issues with libc++. However GCC accepts this code when compiling
diff --git a/libcxxabi/test/test_exception_address_alignment.pass.cpp b/libcxxabi/test/test_exception_address_alignment.pass.cpp
--- a/libcxxabi/test/test_exception_address_alignment.pass.cpp
+++ b/libcxxabi/test/test_exception_address_alignment.pass.cpp
@@ -14,9 +14,6 @@
 // tests to fail when compiling against such a SDK, or when running against a
 // system libc++abi that was compiled with an incorrect definition of _Unwind_Exception.
 // XFAIL: apple-clang-12.0.0 && !target={{arm.*}}
-// XFAIL: apple-clang-11 && !target={{arm.*}}
-// XFAIL: apple-clang-10 && !target={{arm.*}}
-// XFAIL: apple-clang-9 && !target={{arm.*}}
 // XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
 
 // Test that the address of the exception object is properly aligned as required
diff --git a/pstl/test/std/algorithms/alg.modifying.operations/alg.reverse/reverse_copy.pass.cpp b/pstl/test/std/algorithms/alg.modifying.operations/alg.reverse/reverse_copy.pass.cpp
--- a/pstl/test/std/algorithms/alg.modifying.operations/alg.reverse/reverse_copy.pass.cpp
+++ b/pstl/test/std/algorithms/alg.modifying.operations/alg.reverse/reverse_copy.pass.cpp
@@ -120,8 +120,6 @@
 int
 main()
 {
-    // clang-3.8 fails to correctly auto vectorize the loop in some cases of different types of container's elements,
-    // for example: int32_t and int8_t. This issue isn't detected for clang-3.9 and newer versions.
     test<int16_t, int8_t>();
     test<uint16_t, float32_t>();
     test<float64_t, int64_t>();