[all-commits] [llvm/llvm-project] 312054: [clang][headers] Including stddef.h always redefin...

[Ian Anderson via All-commits]

  Branch: refs/heads/release/19.x
  Home:   https://github.com/llvm/llvm-project
  Commit: 3120547296c558634261ec944d7846be56eba306
      https://github.com/llvm/llvm-project/commit/3120547296c558634261ec944d7846be56eba306
  Author: Ian Anderson <iana at apple.com>
  Date:   2024-07-26 (Fri, 26 Jul 2024)

  Changed paths:
    M clang/lib/Headers/stdarg.h
    M clang/lib/Headers/stddef.h
    M clang/test/Headers/stddefneeds.cpp
    A clang/test/Modules/stddef.cpp

  Log Message:
  -----------
  [clang][headers] Including stddef.h always redefines NULL (#99727)

stddef.h always includes __stddef_null.h. This is fine in modules
because it's not possible to re-include the pcm, and it's necessary to
export the _Builtin_stddef.null submodule. However, without modules it
causes NULL to always get redefined which disrupts some C++ code. Rework
the inclusion of __stddef_null.h so that with not building with modules
it's only included if __need_NULL is set by the includer, or it's the
first time stddef.h is being included.

(cherry picked from commit 92a9d4831d5e40c286247c30fcd794563adbef6e)



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