[PATCH] D41087: [Preprocessor] Implement __is_target_{arch|vendor|os|environment} function-like builtin macros

[Alex Lorenz via Phabricator via cfe-commits]

arphaman created this revision.

This patch implements the `__is_target_arch`, `__is_target_vendor`, `__is_target_os`, and `__is_target_environment` Clang preprocessor extensions that were proposed by @compnerd in Bob's cfe-dev post: http://lists.llvm.org/pipermail/cfe-dev/2017-November/056166.html.

These macros can be used to examine the components of the target triple at compile time. A`__has_builtin(__is_target_???)` preprocessor check can be used to check for their availability.


Repository:
  rC Clang

https://reviews.llvm.org/D41087

Files:
  include/clang/Lex/Preprocessor.h
  lib/Lex/PPMacroExpansion.cpp
  test/Preprocessor/is_target.c
  test/Preprocessor/is_target_os_darwin.c
  test/Preprocessor/is_target_unknown.c

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