diff --git a/libcxx/docs/index.rst b/libcxx/docs/index.rst
--- a/libcxx/docs/index.rst
+++ b/libcxx/docs/index.rst
@@ -107,7 +107,7 @@
 Clang        13, 14                                     latest two stable releases per `LLVM's release page <https://releases.llvm.org>`_
 AppleClang   13                                         latest stable release per `Xcode's release page <https://developer.apple.com/documentation/xcode-release-notes>`_
 Open XL      17.1 (AIX)                                 latest stable release per `Open XL's documentation page <https://www.ibm.com/docs/en/openxl-c-and-cpp-aix>`_
-GCC          11              In C++11 or later only     latest stable release per `GCC's release page <https://gcc.gnu.org/releases.html>`_
+GCC          12              In C++11 or later only     latest stable release per `GCC's release page <https://gcc.gnu.org/releases.html>`_
 ============ =============== ========================== =====================
 
 Libc++ also supports common platforms and architectures:
diff --git a/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.const_char_array.pass.cpp b/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.const_char_array.pass.cpp
--- a/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.const_char_array.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.const_char_array.pass.cpp
@@ -8,7 +8,7 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 // TODO FMT Evaluate gcc-11 status
-// UNSUPPORTED: gcc-11
+// UNSUPPORTED: gcc-11, gcc-12
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.functions/format.locale.pass.cpp b/libcxx/test/std/utilities/format/format.functions/format.locale.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/format.locale.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/format.locale.pass.cpp
@@ -9,7 +9,7 @@
 // UNSUPPORTED: no-localization
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 // TODO FMT Evaluate gcc-11 status
-// UNSUPPORTED: gcc-11
+// UNSUPPORTED: gcc-11, gcc-12
 // TODO FMT Investigate AppleClang ICE
 // UNSUPPORTED: apple-clang-13
 
diff --git a/libcxx/test/std/utilities/format/format.functions/format.pass.cpp b/libcxx/test/std/utilities/format/format.functions/format.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/format.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/format.pass.cpp
@@ -8,7 +8,7 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 // TODO FMT Evaluate gcc-11 status
-// UNSUPPORTED: gcc-11
+// UNSUPPORTED: gcc-11, gcc-12
 // TODO FMT Investigate AppleClang ICE
 // UNSUPPORTED: apple-clang-13
 
diff --git a/libcxx/test/std/utilities/format/format.functions/format_to.locale.pass.cpp b/libcxx/test/std/utilities/format/format.functions/format_to.locale.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/format_to.locale.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/format_to.locale.pass.cpp
@@ -9,7 +9,7 @@
 // UNSUPPORTED: no-localization
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 // TODO FMT Evaluate gcc-11 status
-// UNSUPPORTED: gcc-11
+// UNSUPPORTED: gcc-11, gcc-12
 // TODO FMT Investigate AppleClang ICE
 // UNSUPPORTED: apple-clang-13
 
diff --git a/libcxx/test/std/utilities/format/format.functions/format_to.pass.cpp b/libcxx/test/std/utilities/format/format.functions/format_to.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/format_to.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/format_to.pass.cpp
@@ -8,7 +8,7 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 // TODO FMT Evaluate gcc-11 status
-// UNSUPPORTED: gcc-11
+// UNSUPPORTED: gcc-11, gcc-12
 // TODO FMT Investigate AppleClang ICE
 // UNSUPPORTED: apple-clang-13
 
diff --git a/libcxx/test/std/utilities/format/format.functions/format_to_n.locale.pass.cpp b/libcxx/test/std/utilities/format/format.functions/format_to_n.locale.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/format_to_n.locale.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/format_to_n.locale.pass.cpp
@@ -9,7 +9,7 @@
 // UNSUPPORTED: no-localization
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 // TODO FMT Evaluate gcc-11 status
-// UNSUPPORTED: gcc-11
+// UNSUPPORTED: gcc-11, gcc-12
 // TODO FMT Investigate AppleClang ICE
 // UNSUPPORTED: apple-clang-13
 
diff --git a/libcxx/test/std/utilities/format/format.functions/format_to_n.pass.cpp b/libcxx/test/std/utilities/format/format.functions/format_to_n.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/format_to_n.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/format_to_n.pass.cpp
@@ -8,7 +8,7 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 // TODO FMT Evaluate gcc-11 status
-// UNSUPPORTED: gcc-11
+// UNSUPPORTED: gcc-11, gcc-12
 // TODO FMT Investigate AppleClang ICE
 // UNSUPPORTED: apple-clang-13
 
diff --git a/libcxx/test/std/utilities/format/format.functions/formatted_size.locale.pass.cpp b/libcxx/test/std/utilities/format/format.functions/formatted_size.locale.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/formatted_size.locale.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/formatted_size.locale.pass.cpp
@@ -9,7 +9,7 @@
 // UNSUPPORTED: no-localization
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 // TODO FMT Evaluate gcc-11 status
-// UNSUPPORTED: gcc-11
+// UNSUPPORTED: gcc-11, gcc-12
 // TODO FMT Investigate AppleClang ICE
 // UNSUPPORTED: apple-clang-13
 
diff --git a/libcxx/test/std/utilities/format/format.functions/formatted_size.pass.cpp b/libcxx/test/std/utilities/format/format.functions/formatted_size.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/formatted_size.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/formatted_size.pass.cpp
@@ -8,7 +8,7 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 // TODO FMT Evaluate gcc-11 status
-// UNSUPPORTED: gcc-11
+// UNSUPPORTED: gcc-11, gcc-12
 // TODO FMT Investigate AppleClang ICE
 // UNSUPPORTED: apple-clang-13
 
diff --git a/libcxx/test/std/utilities/format/format.functions/locale-specific_form.pass.cpp b/libcxx/test/std/utilities/format/format.functions/locale-specific_form.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/locale-specific_form.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/locale-specific_form.pass.cpp
@@ -15,7 +15,7 @@
 // XFAIL: LIBCXX-DEBUG-FIXME
 
 // TODO FMT Evaluate gcc-11 status
-// UNSUPPORTED: gcc-11
+// UNSUPPORTED: gcc-11, gcc-12
 
 // REQUIRES: locale.en_US.UTF-8
 
diff --git a/libcxx/test/std/utilities/format/format.functions/vformat.locale.pass.cpp b/libcxx/test/std/utilities/format/format.functions/vformat.locale.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/vformat.locale.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/vformat.locale.pass.cpp
@@ -9,7 +9,7 @@
 // UNSUPPORTED: no-localization
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 // TODO FMT Evaluate gcc-11 status
-// UNSUPPORTED: gcc-11
+// UNSUPPORTED: gcc-11, gcc-12
 // TODO FMT Investigate AppleClang ICE
 // UNSUPPORTED: apple-clang-13
 
diff --git a/libcxx/test/std/utilities/format/format.functions/vformat.pass.cpp b/libcxx/test/std/utilities/format/format.functions/vformat.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/vformat.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/vformat.pass.cpp
@@ -8,7 +8,7 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 // TODO FMT Evaluate gcc-11 status
-// UNSUPPORTED: gcc-11
+// UNSUPPORTED: gcc-11, gcc-12
 // TODO FMT Investigate AppleClang ICE
 // UNSUPPORTED: apple-clang-13
 
diff --git a/libcxx/test/std/utilities/format/format.functions/vformat_to.locale.pass.cpp b/libcxx/test/std/utilities/format/format.functions/vformat_to.locale.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/vformat_to.locale.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/vformat_to.locale.pass.cpp
@@ -9,7 +9,7 @@
 // UNSUPPORTED: no-localization
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 // TODO FMT Evaluate gcc-11 status
-// UNSUPPORTED: gcc-11
+// UNSUPPORTED: gcc-11, gcc-12
 // TODO FMT Investigate AppleClang ICE
 // UNSUPPORTED: apple-clang-13
 
diff --git a/libcxx/test/std/utilities/format/format.functions/vformat_to.pass.cpp b/libcxx/test/std/utilities/format/format.functions/vformat_to.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/vformat_to.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/vformat_to.pass.cpp
@@ -8,7 +8,7 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 // TODO FMT Evaluate gcc-11 status
-// UNSUPPORTED: gcc-11
+// UNSUPPORTED: gcc-11, gcc-12
 // TODO FMT Investigate AppleClang ICE
 // UNSUPPORTED: apple-clang-13
 
diff --git a/libcxx/test/std/utilities/utility/pairs/pairs.pair/implicit_deduction_guides.pass.cpp b/libcxx/test/std/utilities/utility/pairs/pairs.pair/implicit_deduction_guides.pass.cpp
--- a/libcxx/test/std/utilities/utility/pairs/pairs.pair/implicit_deduction_guides.pass.cpp
+++ b/libcxx/test/std/utilities/utility/pairs/pairs.pair/implicit_deduction_guides.pass.cpp
@@ -11,7 +11,7 @@
 // GCC's implementation of class template deduction is still immature and runs
 // into issues with libc++. However GCC accepts this code when compiling
 // against libstdc++.
-// XFAIL: gcc
+// XFAIL: gcc-11
 
 // <utility>
 
diff --git a/libcxx/utils/ci/run-buildbot b/libcxx/utils/ci/run-buildbot
--- a/libcxx/utils/ci/run-buildbot
+++ b/libcxx/utils/ci/run-buildbot
@@ -281,8 +281,8 @@
     check-abi-list
 ;;
 generic-gcc)
-    export CC=gcc-11
-    export CXX=g++-11
+    export CC=gcc-12
+    export CXX=g++-12
     clean
     generate-cmake -DLIBCXX_ENABLE_WERROR=NO \
                    -DLIBCXXABI_ENABLE_WERROR=NO \
@@ -290,8 +290,8 @@
     check-runtimes
 ;;
 generic-gcc-cxx11)
-    export CC=gcc-11
-    export CXX=g++-11
+    export CC=gcc-12
+    export CXX=g++-12
     clean
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-cxx11.cmake" \
                    -DLIBCXX_ENABLE_WERROR=NO \
diff --git a/libcxx/utils/libcxx/test/params.py b/libcxx/utils/libcxx/test/params.py
--- a/libcxx/utils/libcxx/test/params.py
+++ b/libcxx/utils/libcxx/test/params.py
@@ -28,6 +28,10 @@
   # functions, but we know better what we're doing/testing in the test suite.
   '-Wno-sized-deallocation',
 
+  # GCC warns about this when TEST_IS_CONSTANT_EVALUATED is used on a non-constexpr
+  # function. (This mostely happens in C++11 mode.)
+  '-Wno-tautological-compare',
+
   # Turn off warnings about user-defined literals with reserved suffixes. Those are
   # just noise since we are testing the Standard Library itself.
   '-Wno-literal-suffix', # GCC
diff --git a/libcxxabi/test/catch_member_function_pointer_02.pass.cpp b/libcxxabi/test/catch_member_function_pointer_02.pass.cpp
--- a/libcxxabi/test/catch_member_function_pointer_02.pass.cpp
+++ b/libcxxabi/test/catch_member_function_pointer_02.pass.cpp
@@ -15,7 +15,7 @@
 
 // GCC supports noexcept function types but this test still fails.
 // This is likely a bug in their implementation. Investigation needed.
-// XFAIL: gcc-11
+// XFAIL: gcc-11, gcc-12
 
 #include <cassert>