distinguish gcc and clang for INLINE_ONLY

H/inline-only.h

@@ -1,10 +1,14 @@
 #ifndef _YAP_INLINE_ONLY_H_
 #define _YAP_INLINE_ONLY_H_
 
-#ifdef __GNUC__
+#ifdef __clang__
 #define INLINE_ONLY __attribute__((gnu_inline,always_inline))
 #else
+#ifdef __GNUC__
+#define INLINE_ONLY __attribute__((always_inline))
+#else
 #define INLINE_ONLY
 #endif
+#endif
 
 #endif