[all-commits] [llvm/llvm-project] 5ab944: [C2y] Add stdcountof.h (#140890)

[Aaron Ballman via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5ab944a8c6a213beb96f3747a441b02e497732e4
      https://github.com/llvm/llvm-project/commit/5ab944a8c6a213beb96f3747a441b02e497732e4
  Author: Aaron Ballman <aaron at aaronballman.com>
  Date:   2025-05-28 (Wed, 28 May 2025)

  Changed paths:
    M clang/docs/ReleaseNotes.rst
    M clang/lib/Headers/CMakeLists.txt
    M clang/lib/Headers/module.modulemap
    A clang/lib/Headers/stdcountof.h
    M clang/lib/Lex/ModuleMap.cpp
    M clang/lib/Lex/PPDirectives.cpp
    M clang/test/C/C2y/n3469.c
    M clang/test/Modules/Inputs/builtin-headers/system-modules.modulemap
    M clang/test/Modules/builtin-headers.mm

  Log Message:
  -----------
  [C2y] Add stdcountof.h (#140890)

WG14 N3469 changed _Lengthof to _Countof but it also introduced the
<stdcountof.h> header to expose a macro with a non-ugly identifier. GCC
vends this header as part of the compiler implementation, so Clang
should do the same.

Suggested-by: Alejandro Colomar <alx at kernel.org>



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