svn commit: r254477 - stable/9/include

[Ed Maste]

Author: emaste
Date: Sun Aug 18 08:18:49 2013
New Revision: 254477
URL: http://svnweb.freebsd.org/changeset/base/254477

Log:
  MFC r239960:
  
    Properly enable Clang-style atomics when available.
  
    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.
  
  PR:	threads/170073

Modified:
  stable/9/include/stdatomic.h
Directory Properties:
  stable/9/include/   (props changed)

Modified: stable/9/include/stdatomic.h
==============================================================================
--- stable/9/include/stdatomic.h	Sun Aug 18 06:08:52 2013	(r254476)
+++ stable/9/include/stdatomic.h	Sun Aug 18 08:18:49 2013	(r254477)
@@ -33,7 +33,7 @@
 #include <sys/cdefs.h>
 #include <sys/_types.h>
 
-#if __has_feature(cxx_atomic)
+#if __has_extension(c_atomic) || __has_extension(cxx_atomic)
 #define	__CLANG_ATOMICS
 #elif __GNUC_PREREQ__(4, 7)
 #define	__GNUC_ATOMICS