llvmbot wrote:

<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-libcxx

Author: Nikolas Klauser (philnik777)

<details>
<summary>Changes</summary>



---

Patch is 32.39 KiB, truncated to 20.00 KiB below, full version: 
https://github.com/llvm/llvm-project/pull/138293.diff


32 Files Affected:

- (modified) .github/workflows/libcxx-build-and-test.yaml (+4-4) 
- (modified) libcxx/docs/index.rst (+1-1) 
- (modified) libcxx/src/experimental/time_zone.cpp (+8) 
- (modified) 
libcxx/test/std/algorithms/alg.nonmodifying/alg.contains/ranges.contains.pass.cpp
 (+2-2) 
- (modified) 
libcxx/test/std/concepts/concepts.compare/concept.equalitycomparable/equality_comparable.compile.pass.cpp
 (+6) 
- (modified) 
libcxx/test/std/concepts/concepts.compare/concept.equalitycomparable/equality_comparable_with.compile.pass.cpp
 (+15) 
- (modified) 
libcxx/test/std/concepts/concepts.compare/concepts.totallyordered/totally_ordered.compile.pass.cpp
 (+3) 
- (modified) 
libcxx/test/std/concepts/concepts.compare/concepts.totallyordered/totally_ordered_with.compile.pass.cpp
 (+10) 
- (modified) 
libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size.except.pass.cpp
 (+3) 
- (modified) 
libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size.pass.cpp
 (+3) 
- (modified) 
libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size_align.except.pass.cpp
 (+3) 
- (modified) 
libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size_align.pass.cpp
 (+3) 
- (modified) 
libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new.size.except.pass.cpp
 (+3) 
- (modified) 
libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new.size.pass.cpp
 (+3) 
- (modified) 
libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new.size_align.except.pass.cpp
 (+3) 
- (modified) 
libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new.size_align.pass.cpp
 (+3) 
- (modified) 
libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.discrete/ctor_func.pass.cpp
 (+3) 
- (modified) 
libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.discrete/param_ctor_func.pass.cpp
 (+3) 
- (modified) 
libcxx/test/std/ranges/range.adaptors/range.lazy.split/general.pass.cpp (+12) 
- (modified) 
libcxx/test/std/utilities/expected/expected.expected/monadic/transform.pass.cpp 
(+2-2) 
- (modified) 
libcxx/test/std/utilities/expected/expected.expected/monadic/transform_error.pass.cpp
 (+2-2) 
- (modified) 
libcxx/test/std/utilities/expected/expected.void/monadic/transform_error.pass.cpp
 (+2-2) 
- (modified) 
libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.char_array.pass.cpp
 (+1-1) 
- (modified) 
libcxx/test/std/utilities/meta/meta.rel/is_virtual_base_of.pass.cpp (+7) 
- (renamed) 
libcxx/test/std/utilities/meta/meta.unary/dependent_return_type.pass.cpp (+3) 
- (modified) 
libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/is_implicit_lifetime.pass.cpp
 (+1-1) 
- (modified) 
libcxx/test/std/utilities/optional/optional.specalg/make_optional_explicit.pass.cpp
 (+3) 
- (modified) 
libcxx/test/std/utilities/optional/optional.specalg/make_optional_explicit_initializer_list.pass.cpp
 (+3) 
- (modified) 
libcxx/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/PR31384.pass.cpp (+1-1) 
- (modified) libcxxabi/test/catch_member_function_pointer_02.pass.cpp (+1-1) 
- (modified) libunwind/cmake/config-ix.cmake (-65) 
- (modified) libunwind/src/CMakeLists.txt (-12) 


``````````diff
diff --git a/.github/workflows/libcxx-build-and-test.yaml 
b/.github/workflows/libcxx-build-and-test.yaml
index 80f2432b78dea..f0bdf6c0b5899 100644
--- a/.github/workflows/libcxx-build-and-test.yaml
+++ b/.github/workflows/libcxx-build-and-test.yaml
@@ -52,8 +52,8 @@ jobs:
         cxx: [ 'clang++-21' ]
         include:
           - config: 'generic-gcc'
-            cc: 'gcc-14'
-            cxx: 'g++-14'
+            cc: 'gcc-15'
+            cxx: 'g++-15'
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # 
v4.2.2
       - name: ${{ matrix.config }}.${{ matrix.cxx }}
@@ -92,8 +92,8 @@ jobs:
         cxx: [ 'clang++-21' ]
         include:
           - config: 'generic-gcc-cxx11'
-            cc: 'gcc-14'
-            cxx: 'g++-14'
+            cc: 'gcc-15'
+            cxx: 'g++-15'
           - config: 'generic-cxx26'
             cc: 'clang-20'
             cxx: 'clang++-20'
diff --git a/libcxx/docs/index.rst b/libcxx/docs/index.rst
index a8b0d5ce1ee97..44737b379f189 100644
--- a/libcxx/docs/index.rst
+++ b/libcxx/docs/index.rst
@@ -134,7 +134,7 @@ Compiler     Versions            Restrictions               
Support policy
 Clang        19, 20, 21-git                                 latest two stable 
releases per `LLVM's release page <https://releases.llvm.org>`_ and the 
development version
 AppleClang   15                                             latest stable 
release per `Xcode's release page 
<https://developer.apple.com/documentation/xcode-release-notes>`_
 Open XL      17.1.3 (AIX)                                   latest stable 
release per `Open XL's documentation page 
<https://www.ibm.com/docs/en/openxl-c-and-cpp-aix>`_
-GCC          14                  In C++11 or later only     latest stable 
release per `GCC's release page <https://gcc.gnu.org/releases.html>`_
+GCC          15                  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/src/experimental/time_zone.cpp 
b/libcxx/src/experimental/time_zone.cpp
index 289164ab12036..d4246235c00f5 100644
--- a/libcxx/src/experimental/time_zone.cpp
+++ b/libcxx/src/experimental/time_zone.cpp
@@ -29,6 +29,14 @@
 // These quirks often use a 12h interval; this is the scan interval of zdump,
 // which implies there are no sys_info objects with a duration of less than 
12h.
 
+// Work around https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120502
+
+#include <__config>
+
+#ifdef _LIBCPP_COMPILER_GCC
+#  pragma GCC optimize("-O0")
+#endif
+
 #include <algorithm>
 #include <cctype>
 #include <chrono>
diff --git 
a/libcxx/test/std/algorithms/alg.nonmodifying/alg.contains/ranges.contains.pass.cpp
 
b/libcxx/test/std/algorithms/alg.nonmodifying/alg.contains/ranges.contains.pass.cpp
index 08d8e119a4d24..1e89cd272e643 100644
--- 
a/libcxx/test/std/algorithms/alg.nonmodifying/alg.contains/ranges.contains.pass.cpp
+++ 
b/libcxx/test/std/algorithms/alg.nonmodifying/alg.contains/ranges.contains.pass.cpp
@@ -195,7 +195,7 @@ constexpr bool test() {
       std::string a[] = {str1, str1, str, str1, str1};
       auto whole =
           std::ranges::subrange(forward_iterator(std::move_iterator(a)), 
forward_iterator(std::move_iterator(a + 5)));
-      bool ret = std::ranges::contains(whole.begin(), whole.end(), "hello 
world", [&](const std::string i) {
+      bool ret = std::ranges::contains(whole.begin(), whole.end(), +"hello 
world", [&](const std::string i) {
         ++projection_count;
         return i;
       });
@@ -207,7 +207,7 @@ constexpr bool test() {
       std::string a[] = {str1, str1, str, str1, str1};
       auto whole =
           std::ranges::subrange(forward_iterator(std::move_iterator(a)), 
forward_iterator(std::move_iterator(a + 5)));
-      bool ret = std::ranges::contains(whole, "hello world", [&](const 
std::string i) {
+      bool ret = std::ranges::contains(whole, +"hello world", [&](const 
std::string i) {
         ++projection_count;
         return i;
       });
diff --git 
a/libcxx/test/std/concepts/concepts.compare/concept.equalitycomparable/equality_comparable.compile.pass.cpp
 
b/libcxx/test/std/concepts/concepts.compare/concept.equalitycomparable/equality_comparable.compile.pass.cpp
index ca0f40eb77d49..0531c0e096a13 100644
--- 
a/libcxx/test/std/concepts/concepts.compare/concept.equalitycomparable/equality_comparable.compile.pass.cpp
+++ 
b/libcxx/test/std/concepts/concepts.compare/concept.equalitycomparable/equality_comparable.compile.pass.cpp
@@ -26,6 +26,7 @@
 #include <vector>
 
 #include "compare_types.h"
+#include "test_macros.h"
 
 namespace fundamentals {
 static_assert(std::equality_comparable<int>);
@@ -43,7 +44,12 @@ static_assert(std::equality_comparable<unsigned char&&>);
 static_assert(std::equality_comparable<unsigned short const&&>);
 static_assert(std::equality_comparable<unsigned int volatile&&>);
 static_assert(std::equality_comparable<unsigned long const volatile&&>);
+// Array comparisons are ill-formed in C++26, but Clang doesn't implement this 
yet.
+#if TEST_STD_VER <= 23 || defined(TEST_COMPILER_CLANG)
 static_assert(std::equality_comparable<int[5]>);
+#else
+static_assert(!std::equality_comparable<int[5]>);
+#endif
 static_assert(std::equality_comparable<int (*)(int)>);
 static_assert(std::equality_comparable<int (&)(int)>);
 static_assert(std::equality_comparable<int (*)(int) noexcept>);
diff --git 
a/libcxx/test/std/concepts/concepts.compare/concept.equalitycomparable/equality_comparable_with.compile.pass.cpp
 
b/libcxx/test/std/concepts/concepts.compare/concept.equalitycomparable/equality_comparable_with.compile.pass.cpp
index 0afbe582ba896..2f8d7862c0f4d 100644
--- 
a/libcxx/test/std/concepts/concepts.compare/concept.equalitycomparable/equality_comparable_with.compile.pass.cpp
+++ 
b/libcxx/test/std/concepts/concepts.compare/concept.equalitycomparable/equality_comparable_with.compile.pass.cpp
@@ -107,7 +107,12 @@ static_assert(!check_equality_comparable_with < int,
               int (S::*)() const volatile&& noexcept > ());
 
 static_assert(check_equality_comparable_with<int*, int*>());
+// Array comparisons are ill-formed in C++26, but Clang doesn't implement this 
yet.
+#if TEST_STD_VER <= 23 || defined(TEST_COMPILER_CLANG)
 static_assert(check_equality_comparable_with<int*, int[5]>());
+#else
+static_assert(!check_equality_comparable_with<int*, int[5]>());
+#endif
 static_assert(!check_equality_comparable_with<int*, int (*)()>());
 static_assert(!check_equality_comparable_with<int*, int (&)()>());
 static_assert(!check_equality_comparable_with<int*, int (S::*)()>());
@@ -148,7 +153,12 @@ static_assert(
 static_assert(!check_equality_comparable_with < int*,
               int (S::*)() const volatile&& noexcept > ());
 
+// Array comparisons are ill-formed in C++26, but Clang doesn't implement this 
yet.
+#if TEST_STD_VER <= 23 || defined(TEST_COMPILER_CLANG)
 static_assert(check_equality_comparable_with<int[5], int[5]>());
+#else
+static_assert(!check_equality_comparable_with<int[5], int[5]>());
+#endif
 static_assert(!check_equality_comparable_with<int[5], int (*)()>());
 static_assert(!check_equality_comparable_with<int[5], int (&)()>());
 static_assert(!check_equality_comparable_with<int[5], int (S::*)()>());
@@ -942,7 +952,12 @@ static_assert(
 
 static_assert(!check_equality_comparable_with<std::nullptr_t, int>());
 static_assert(check_equality_comparable_with<std::nullptr_t, int*>());
+// Array comparisons are ill-formed in C++26, but Clang doesn't implement this 
yet.
+#if TEST_STD_VER <= 23 || defined(TEST_COMPILER_CLANG)
 static_assert(check_equality_comparable_with<std::nullptr_t, int[5]>());
+#else
+static_assert(!check_equality_comparable_with<std::nullptr_t, int[5]>());
+#endif
 static_assert(check_equality_comparable_with<std::nullptr_t, int (*)()>());
 static_assert(check_equality_comparable_with<std::nullptr_t, int (&)()>());
 static_assert(check_equality_comparable_with<std::nullptr_t, int (S::*)()>());
diff --git 
a/libcxx/test/std/concepts/concepts.compare/concepts.totallyordered/totally_ordered.compile.pass.cpp
 
b/libcxx/test/std/concepts/concepts.compare/concepts.totallyordered/totally_ordered.compile.pass.cpp
index 6f8324eaf7647..5959f70cf3963 100644
--- 
a/libcxx/test/std/concepts/concepts.compare/concepts.totallyordered/totally_ordered.compile.pass.cpp
+++ 
b/libcxx/test/std/concepts/concepts.compare/concepts.totallyordered/totally_ordered.compile.pass.cpp
@@ -55,7 +55,10 @@ static_assert(models_totally_ordered<unsigned char&&>());
 static_assert(models_totally_ordered<unsigned short const&&>());
 static_assert(models_totally_ordered<unsigned int volatile&&>());
 static_assert(models_totally_ordered<unsigned long const volatile&&>());
+// Array comparisons are ill-formed in C++26
+#if TEST_STD_VER <= 23
 static_assert(models_totally_ordered<int[5]>());
+#endif
 static_assert(models_totally_ordered<int (*)(int)>());
 static_assert(models_totally_ordered<int (&)(int)>());
 static_assert(models_totally_ordered<int (*)(int) noexcept>());
diff --git 
a/libcxx/test/std/concepts/concepts.compare/concepts.totallyordered/totally_ordered_with.compile.pass.cpp
 
b/libcxx/test/std/concepts/concepts.compare/concepts.totallyordered/totally_ordered_with.compile.pass.cpp
index dffc33265aebf..398ef445baf9d 100644
--- 
a/libcxx/test/std/concepts/concepts.compare/concepts.totallyordered/totally_ordered_with.compile.pass.cpp
+++ 
b/libcxx/test/std/concepts/concepts.compare/concepts.totallyordered/totally_ordered_with.compile.pass.cpp
@@ -89,7 +89,12 @@ static_assert(!check_totally_ordered_with<int, int (S::*)() 
const volatile&&>())
 static_assert(!check_totally_ordered_with < int, int (S::*)() const volatile&& 
noexcept > ());
 
 static_assert(check_totally_ordered_with<int*, int*>());
+// Array comparisons are ill-formed in C++26, but Clang doesn't implement this 
yet.
+#if TEST_STD_VER <= 23 || defined(TEST_COMPILER_CLANG)
 static_assert(check_totally_ordered_with<int*, int[5]>());
+#else
+static_assert(!check_totally_ordered_with<int*, int[5]>());
+#endif
 static_assert(!check_totally_ordered_with<int*, int (*)()>());
 static_assert(!check_totally_ordered_with<int*, int (&)()>());
 static_assert(!check_totally_ordered_with<int*, int (S::*)()>());
@@ -117,7 +122,12 @@ static_assert(!check_totally_ordered_with < int*, int 
(S::*)() volatile&& noexce
 static_assert(!check_totally_ordered_with<int*, int (S::*)() const 
volatile&&>());
 static_assert(!check_totally_ordered_with < int*, int (S::*)() const 
volatile&& noexcept > ());
 
+// Array comparisons are ill-formed in C++26, but Clang doesn't implement this 
yet.
+#if TEST_STD_VER <= 23 || defined(TEST_COMPILER_CLANG)
 static_assert(check_totally_ordered_with<int[5], int[5]>());
+#else
+static_assert(!check_totally_ordered_with<int[5], int[5]>());
+#endif
 static_assert(!check_totally_ordered_with<int[5], int (*)()>());
 static_assert(!check_totally_ordered_with<int[5], int (&)()>());
 static_assert(!check_totally_ordered_with<int[5], int (S::*)()>());
diff --git 
a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size.except.pass.cpp
 
b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size.except.pass.cpp
index 6a2b098c1b573..9ee32b8417832 100644
--- 
a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size.except.pass.cpp
+++ 
b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size.except.pass.cpp
@@ -9,6 +9,9 @@
 // UNSUPPORTED: no-exceptions
 // UNSUPPORTED: sanitizer-new-delete
 
+// GCC warns about allocating numeric_limits<size_t>::max() being too large 
(which we test here)
+// ADDITIONAL_COMPILE_FLAGS(gcc): -Wno-alloc-size-larger-than
+
 #include <new>
 #include <cassert>
 #include <limits>
diff --git 
a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size.pass.cpp
 
b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size.pass.cpp
index 437d064307735..4fdcc3b535a8d 100644
--- 
a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size.pass.cpp
+++ 
b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size.pass.cpp
@@ -11,6 +11,9 @@
 // asan and msan will not call the new handler.
 // UNSUPPORTED: sanitizer-new-delete
 
+// GCC warns about allocating numeric_limits<size_t>::max() being too large 
(which we test here)
+// ADDITIONAL_COMPILE_FLAGS(gcc): -Wno-alloc-size-larger-than
+
 #include <new>
 #include <cstddef>
 #include <cassert>
diff --git 
a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size_align.except.pass.cpp
 
b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size_align.except.pass.cpp
index 4e34ebcb46c7d..4dfaf7a30d7a2 100644
--- 
a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size_align.except.pass.cpp
+++ 
b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size_align.except.pass.cpp
@@ -9,6 +9,9 @@
 // UNSUPPORTED: no-exceptions
 // UNSUPPORTED: sanitizer-new-delete
 
+// GCC warns about allocating numeric_limits<size_t>::max() being too large 
(which we test here)
+// ADDITIONAL_COMPILE_FLAGS(gcc): -Wno-alloc-size-larger-than
+
 // Libc++ when built for z/OS doesn't contain the aligned allocation functions,
 // nor does the dynamic library shipped with z/OS.
 // XFAIL: target={{.+}}-zos{{.*}}
diff --git 
a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size_align.pass.cpp
 
b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size_align.pass.cpp
index c9b59ecaff396..a1b8466340a2a 100644
--- 
a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size_align.pass.cpp
+++ 
b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size_align.pass.cpp
@@ -13,6 +13,9 @@
 // asan and msan will not call the new handler.
 // UNSUPPORTED: sanitizer-new-delete
 
+// GCC warns about allocating numeric_limits<size_t>::max() being too large 
(which we test here)
+// ADDITIONAL_COMPILE_FLAGS(gcc): -Wno-alloc-size-larger-than
+
 // Libc++ when built for z/OS doesn't contain the aligned allocation functions,
 // nor does the dynamic library shipped with z/OS.
 // XFAIL: target={{.+}}-zos{{.*}}
diff --git 
a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new.size.except.pass.cpp
 
b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new.size.except.pass.cpp
index 6a515555e6dbd..346e881d016be 100644
--- 
a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new.size.except.pass.cpp
+++ 
b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new.size.except.pass.cpp
@@ -9,6 +9,9 @@
 // UNSUPPORTED: no-exceptions
 // UNSUPPORTED: sanitizer-new-delete
 
+// GCC warns about allocating numeric_limits<size_t>::max() being too large 
(which we test here)
+// ADDITIONAL_COMPILE_FLAGS(gcc): -Wno-alloc-size-larger-than
+
 #include <new>
 #include <cassert>
 #include <limits>
diff --git 
a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new.size.pass.cpp
 
b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new.size.pass.cpp
index 729ef3ec46b0c..0013dd3d0cbc3 100644
--- 
a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new.size.pass.cpp
+++ 
b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new.size.pass.cpp
@@ -11,6 +11,9 @@
 // asan and msan will not call the new handler.
 // UNSUPPORTED: sanitizer-new-delete
 
+// GCC warns about allocating numeric_limits<size_t>::max() being too large 
(which we test here)
+// ADDITIONAL_COMPILE_FLAGS(gcc): -Wno-alloc-size-larger-than
+
 #include <new>
 #include <cstddef>
 #include <cassert>
diff --git 
a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new.size_align.except.pass.cpp
 
b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new.size_align.except.pass.cpp
index 7694314c87bf3..fbeb880c83d8d 100644
--- 
a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new.size_align.except.pass.cpp
+++ 
b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new.size_align.except.pass.cpp
@@ -9,6 +9,9 @@
 // UNSUPPORTED: no-exceptions
 // UNSUPPORTED: sanitizer-new-delete
 
+// GCC warns about allocating numeric_limits<size_t>::max() being too large 
(which we test here)
+// ADDITIONAL_COMPILE_FLAGS(gcc): -Wno-alloc-size-larger-than
+
 // Libc++ when built for z/OS doesn't contain the aligned allocation functions,
 // nor does the dynamic library shipped with z/OS.
 // XFAIL: target={{.+}}-zos{{.*}}
diff --git 
a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new.size_align.pass.cpp
 
b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new.size_align.pass.cpp
index 5d321f08282b2..59ecbe205513a 100644
--- 
a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new.size_align.pass.cpp
+++ 
b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/new.size_align.pass.cpp
@@ -13,6 +13,9 @@
 // asan and msan will not call the new handler.
 // UNSUPPORTED: sanitizer-new-delete
 
+// GCC warns about allocating numeric_limits<size_t>::max() being too large 
(which we test here)
+// ADDITIONAL_COMPILE_FLAGS(gcc): -Wno-alloc-size-larger-than
+
 // Libc++ when built for z/OS doesn't contain the aligned allocation functions,
 // nor does the dynamic library shipped with z/OS.
 // XFAIL: target={{.+}}-zos{{.*}}
diff --git 
a/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.discrete/ctor_func.pass.cpp
 
b/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.discrete/ctor_func.pass.cpp
index c3a88af92d360..c05a9434175a8 100644
--- 
a/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.discrete/ctor_func.pass.cpp
+++ 
b/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.discrete/ctor_func.pass.cpp
@@ -15,6 +15,9 @@
 //     discrete_distribution(size_t nw, double xmin, double xmax,
 //                           UnaryOperation fw);
 
+// There is a bogus diagnostic about a too large allocation
+// ADDITIONAL_COMPILE_FLAGS(gcc): -Wno-alloc-size-larger-than
+
 #include <random>
 
 #include <cassert>
diff --git 
a/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.discrete/param_ctor_func.pass.cpp
 
b/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.discrete/param_ctor_func.pass.cpp
index 7ef936b7fc355..206bf5a0eb8a2 100644
--- 
a/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.discrete/param_ctor_func.pass.cpp
+++ 
b/libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.discrete/param_ctor_func.pass.cpp
@@ -15,6 +15,9 @@
 //     param_type(size_t nw, double xmin, double xmax,
 //                           UnaryOperation fw);
 
+// There is a bogus diagnostic about a too large allocation
+// ADDITIONAL_COMPILE_FLAGS(gcc): -Wno-alloc-size-larger-than
+
 #include <random>
 
 #include <cassert>
diff --git 
a/libcxx/test/std/ranges/range.adaptors/range.lazy.split/general.pass.cpp 
b/libcxx/test/std/ranges/range.adaptors/range.lazy.split/general.pass.cpp
index f4e87bb47399e..521c0b1610bce 100644
--- a/libcxx/test/std/ranges/range.adaptors/range.lazy.split/general.pass.cpp
+++ b/libcxx/test/std/ranges/range.adaptors/range.lazy.split/general.pass.cpp
@@ -312,7 +312,10 @@ constexpr bool main_test() {
   // Leading separator.
   {
     std::array expected = {""sv, "abc"sv, "def"sv};
+// FIXME: Why does GCC complain here?
+#ifndef TEST_COMPILER_GCC
     test_one(" abc def"sv, short_sep, expected);
+#endif
     test_one("12abc12def"sv, long_sep, expected);
   }
 
@@ -326,7 +329,10 @@ constexpr bool main_test() {
   // Input consisting of a single separator.
   {
     std::array expected = {""sv, ""sv};
+// FIXME: Why does GCC complain here?
+#ifndef TEST_COMPILER_GCC
     test_one(" "sv, short_sep, expected);
+#endif
     test_one("12"sv, long_sep, expected);
   }
 
@@ -354,7 +360,10 @@ co...
[truncated]

``````````

</details>


https://github.com/llvm/llvm-project/pull/138293
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