[all-commits] [llvm/llvm-project] 44cc78: [libc++] Fix incorrect usage of __STDC_HOSTED__

[hyd-dev via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 44cc78da056fbda2693f0489275f8e0ff1f590a1
      https://github.com/llvm/llvm-project/commit/44cc78da056fbda2693f0489275f8e0ff1f590a1
  Author: hyd-dev <yd-huang at outlook.com>
  Date:   2020-09-02 (Wed, 02 Sep 2020)

  Changed paths:
    M libcxx/include/__config
    A libcxx/test/libcxx/libcpp_freestanding.sh.cpp

  Log Message:
  -----------
  [libc++] Fix incorrect usage of __STDC_HOSTED__

D56913 introduced the _LIBCPP_FREESTANDING macro and guarded its
definition by:

	#ifndef __STDC_HOSTED__
	#  define _LIBCPP_FREESTANDING
	#endif

However, __STDC_HOSTED__ is defined as 0 in freestanding implementations
instead of undefined, which means that _LIBCPP_FREESTANDING would never
get defined. This patch corrects the above as:

	#if __STDC_HOSTED__ == 0
	#  define _LIBCPP_FREESTANDING
	#endif

Differential Revision: https://reviews.llvm.org/D86055