X-Git-Url: https://git.liburcu.org/?a=blobdiff_plain;f=include%2Furcu%2Fcompiler.h;h=157346763078a3ec1d73b7c65618ed1bd98b325f;hb=0cdbb569aa571e738df8f4280e47ab0aadad576a;hp=4806ee338a99706ae5bb9eedb503fdc54e00c661;hpb=3f0dd283a89ab114ffbf5c3dd46463217c6bb2ff;p=urcu.git

diff --git a/include/urcu/compiler.h b/include/urcu/compiler.h
index 4806ee3..1573467 100644
--- a/include/urcu/compiler.h
+++ b/include/urcu/compiler.h
@@ -108,10 +108,21 @@
 
 #define CAA_ARRAY_SIZE(x)	(sizeof(x) / sizeof((x)[0]))
 
-#ifdef __GNUC__
+/*
+ * URCU_GCC_VERSION is used to blacklist specific GCC versions with known
+ * bugs, clang also defines these macros to an equivalent GCC version it
+ * claims to support, so exclude it.
+ */
+#if defined(__GNUC__) && !defined(__clang__)
 # define URCU_GCC_VERSION	(__GNUC__ * 10000 \
 				+ __GNUC_MINOR__ * 100 \
 				+ __GNUC_PATCHLEVEL__)
 #endif
 
+#ifndef __cplusplus
+#define caa_c_transparent_union	__attribute__((__transparent_union__))
+#else
+#define caa_c_transparent_union
+#endif
+
 #endif /* _URCU_COMPILER_H */