[PATCH] D157793: [Headers] Add missing __need_ macros to stdarg.h

[Ian Anderson via Phabricator via cfe-commits]

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Apple needs a __need_ macro for va_list. Add one, and also ones for va_start/va_arg/va_end, __va_copy, va_copy.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D157793

Files:
  clang/lib/Headers/stdarg.h
  clang/test/Headers/stdarg.c
  clang/test/Headers/stdargneeds.c

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