X-Git-Url: https://git.liburcu.org/?p=urcu.git;a=blobdiff_plain;f=urcu%2Fsystem.h;h=faae39055484875b237dd62dd0928e9903725da1;hp=2a45f22d9615593eda4c2c8c0ec369e500f9535c;hb=b0a841b4ff807dd29fe0cdbfe24900312f0e627b;hpb=bdffa73aa208ad5f1e5b3a3cb6cbf86ac6996559

diff --git a/urcu/system.h b/urcu/system.h
index 2a45f22..faae390 100644
--- a/urcu/system.h
+++ b/urcu/system.h
@@ -32,6 +32,7 @@
  * Load a data from shared memory, doing a cache flush if required.
  */
 #define CMM_LOAD_SHARED(p)			\
+	__extension__			\
 	({				\
 		cmm_smp_rmc();		\
 		_CMM_LOAD_SHARED(p);	\
@@ -41,17 +42,18 @@
  * Identify a shared store. A cmm_smp_wmc() or cmm_smp_mc() should
  * follow the store.
  */
-#define _CMM_STORE_SHARED(x, v)	({ CMM_ACCESS_ONCE(x) = (v); })
+#define _CMM_STORE_SHARED(x, v)	__extension__ ({ CMM_ACCESS_ONCE(x) = (v); })
 
 /*
  * Store v into x, where x is located in shared memory. Performs the
  * required cache flush after writing. Returns v.
  */
-#define CMM_STORE_SHARED(x, v)		\
-	({				\
-		__typeof__(x) _v = _CMM_STORE_SHARED(x, v);	\
-		cmm_smp_wmc();		\
-		_v;			\
+#define CMM_STORE_SHARED(x, v)						\
+	__extension__							\
+	({								\
+		__typeof__(x) _v = _CMM_STORE_SHARED(x, v);		\
+		cmm_smp_wmc();						\
+		_v = _v;	/* Work around clang "unused result" */	\
 	})
 
 #endif /* _URCU_SYSTEM_H */