BUILD/MINOR: ancient gcc versions atomic fix
Commit 1a69af6d3892fe1946bb8babb3044d2d26afd46e introduced code
for atomic prior to 4.7. Unfortunately clang uses as well those
constants which is misleading.
diff --git a/include/common/hathreads.h b/include/common/hathreads.h
index 503abbe..5f0b969 100644
--- a/include/common/hathreads.h
+++ b/include/common/hathreads.h
@@ -100,7 +100,7 @@
/* TODO: thread: For now, we rely on GCC builtins but it could be a good idea to
* have a header file regrouping all functions dealing with threads. */
-#if defined(__GNUC__) && (__GNUC__ < 4 || __GNUC__ == 4 && __GNUC_MINOR__ < 7)
+#if defined(__GNUC__) && (__GNUC__ < 4 || __GNUC__ == 4 && __GNUC_MINOR__ < 7) && !defined(__clang__)
/* gcc < 4.7 */
#define HA_ATOMIC_ADD(val, i) __sync_add_and_fetch(val, i)