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Properly enable Clang-style atomics when available.

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In addition to testing against cxx_atomic, we must check c_atomic. The
former is only set when building C++ code. Also use __has_extension
instead of __has_feature. This allows us to use the atomics outside of
C11.

Reported by:	Ariane van der Steldt <ariane stack nl>
PR:		threads/170073
This commit is contained in:
ed 2012-08-31 22:22:14 +00:00
parent c689c7da4c
commit 114318f8e8
1 changed files with 1 additions and 1 deletions
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2
include/stdatomic.h
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@ -33,7 +33,7 @@
#include <sys/cdefs.h> #include <sys/cdefs.h>
#include <sys/_types.h> #include <sys/_types.h>
#if __has_feature(cxx_atomic) #if __has_extension(c_atomic) || __has_extension(cxx_atomic)
#define __CLANG_ATOMICS #define __CLANG_ATOMICS
#elif __GNUC_PREREQ__(4, 7) #elif __GNUC_PREREQ__(4, 7)
#define __GNUC_ATOMICS #define __GNUC_ATOMICS