From 2e7f57986576cf19b20f0fa8a9e8edd810215c73 Mon Sep 17 00:00:00 2001
From: WeiY <wei.a.yang@gmail.com>
Date: Mon, 15 Jul 2013 23:31:13 +0800
Subject: stdatomic.h support check when configure

---
 cpukit/aclocal/check-atomic.m4 | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

(limited to 'cpukit/aclocal')

diff --git a/cpukit/aclocal/check-atomic.m4 b/cpukit/aclocal/check-atomic.m4
index 97943eb768..00149f8a12 100644
--- a/cpukit/aclocal/check-atomic.m4
+++ b/cpukit/aclocal/check-atomic.m4
@@ -5,9 +5,13 @@ AC_REQUIRE([RTEMS_CANONICAL_TARGET_CPU])dnl
 
 AC_CACHE_CHECK([whether CPU supports atomic operations],
   [rtems_cv_ATOMIC],[
-    AS_IF(
-      [test -f "${srcdir}/score/cpu/$RTEMS_CPU/rtems/score/cpuatomic.h"],
-      [rtems_cv_ATOMIC="yes"],
-      [rtems_cv_ATOMIC="no"])
+    AC_LINK_IFELSE(
+      [AC_LANG_PROGRAM([[#include <stdatomic.h>]],
+        [[atomic_uint_fast32_t t; atomic_init(&t, 0); 
+          atomic_store( &t, 1 );
+          atomic_exchange( &t, 2 );
+          atomic_fetch_add( &t, 3 );]])],
+        [rtems_cv_ATOMIC="yes"],
+        [rtems_cv_ATOMIC="no"])
   ])
 ])
-- 
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