[PATCH] D139266: Headers: tweak inclusion condition for stdatomic.h

[Saleem Abdulrasool via Phabricator via cfe-commits]

This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rGe0c3142af075: Headers: tweak inclusion condition for stdatomic.h (authored by compnerd).

Changed prior to commit:
  https://reviews.llvm.org/D139266?vs=480531&id=483327#toc

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D139266/new/

https://reviews.llvm.org/D139266

Files:
  clang/docs/ReleaseNotes.rst
  clang/lib/Headers/stdatomic.h


Index: clang/lib/Headers/stdatomic.h
===================================================================
--- clang/lib/Headers/stdatomic.h
+++ clang/lib/Headers/stdatomic.h
@@ -15,10 +15,12 @@
  *
  * Exclude the MSVC path as well as the MSVC header as of the 14.31.30818
  * explicitly disallows `stdatomic.h` in the C mode via an `#error`.  Fallback
- * to the clang resource header until that is fully supported.
+ * to the clang resource header until that is fully supported.  The
+ * `stdatomic.h` header requires C++ 23 or newer.
  */
 #if __STDC_HOSTED__ &&                                                         \
-    __has_include_next(<stdatomic.h>) && !(defined(_MSC_VER) && !defined(__cplusplus))
+    __has_include_next(<stdatomic.h>) &&                                       \
+    !(defined(_MSC_VER) && defined(__cplusplus) && __cplusplus < 202002L)
 # include_next <stdatomic.h>
 #else
 
Index: clang/docs/ReleaseNotes.rst
===================================================================
--- clang/docs/ReleaseNotes.rst
+++ clang/docs/ReleaseNotes.rst
@@ -199,6 +199,8 @@
 
 Bug Fixes
 ---------
+- ``stdatomic.h`` will use the internal declarations when targeting pre-C++-23
+  on Windows platforms as the MSVC support requires newer C++ standard.
 - Correct ``_Static_assert`` to accept the same set of extended integer
   constant expressions as is accpted in other contexts that accept them.
   This fixes `Issue 57687 <https://github.com/llvm/llvm-project/issues/57687>`_.


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