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[libcxx] Fix gcc builds.

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Step around a gcc pre-processor defect which causes it to fail to
parse the __has_include macro check.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@281310 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Asiri Rathnayake 2016-09-13 09:32:32 +00:00
parent 8b8913084d
commit f6600b7524
1 changed files with 13 additions and 2 deletions
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15
include/__threading_support
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@ -19,9 +19,20 @@
#ifndef _LIBCPP_HAS_NO_THREADS
#if defined(_LIBCPP_HAS_THREAD_API_EXTERNAL) && (!defined(__has_include) || __has_include(<__external_threading>))
// These checks are carefully arranged so as not to trigger a gcc pre-processor
// defect which causes it to fail to parse the __has_include check below, the
// redundancy is intentional.
#if defined(_LIBCPP_HAS_THREAD_API_EXTERNAL)
#if !defined(__clang__) && (_GNUC_VER < 500)
#include <__external_threading>
#else
#define _LIBCPP_EXTERNAL_THREADING
#elif !defined(__has_include) || __has_include(<__external_threading>)
#include <__external_threading>
#define _LIBCPP_EXTERNAL_THREADING
#endif
#endif
#if !defined(_LIBCPP_EXTERNAL_THREADING)
#include <pthread.h>
#include <sched.h>
#endif