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Index: b/libev/ev.c
===================================================================
--- a/libev/ev.c
+++ b/libev/ev.c
@@ -617,9 +617,11 @@
#if ECB_GCC_VERSION(4,7)
/* see comment below (stdatomic.h) about the C11 memory model. */
#define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
- #elif defined __clang && __has_feature (cxx_atomic)
+ #elif defined __clang
+ #if __has_feature (cxx_atomic)
/* see comment below (stdatomic.h) about the C11 memory model. */
#define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
+ #endif
#elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
#define ECB_MEMORY_FENCE __sync_synchronize ()
#elif _MSC_VER >= 1400 /* VC++ 2005 */
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