[all-commits] [llvm/llvm-project] e0c314: Headers: tweak inclusion condition for stdatomic.h

[Saleem Abdulrasool via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: e0c3142af075e2ef89395dbed5939071345eb622
      https://github.com/llvm/llvm-project/commit/e0c3142af075e2ef89395dbed5939071345eb622
  Author: Saleem Abdulrasool <compnerd at compnerd.org>
  Date:   2022-12-15 (Thu, 15 Dec 2022)

  Changed paths:
    M clang/docs/ReleaseNotes.rst
    M clang/lib/Headers/stdatomic.h

  Log Message:
  -----------
  Headers: tweak inclusion condition for stdatomic.h

MSVC requires that C++23 be available (_HAS_CXX23) else the entire
content is elided. Conditionalise the inclusion properly so that C/C++
code using stdatomic.h for memory_order_* constants are able to do
so without changing the C++ standard. This repairs builds of Swift and
libdispatch after ba49d39b20cc5358da28af2ac82bd336028780bc.

Differential Revision: https://reviews.llvm.org/D139266
Reviewed By: aaron.ballman, Mordante, fsb4000