X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=urcu%2Fcompiler.h;h=074e70026a056cab15d1b05b7537ac333c2daedf;hb=b52a3dc23521f7a21fb5ab3d2b53dad89c586ee4;hp=cd4a49d19dc6e82f454027bfba76dc2f8eb14bf5;hpb=9f59b2209b3a4bde416bcfa55b10c36b16fa91ae;p=userspace-rcu.git

diff --git a/urcu/compiler.h b/urcu/compiler.h
index cd4a49d..074e700 100644
--- a/urcu/compiler.h
+++ b/urcu/compiler.h
@@ -86,9 +86,33 @@
 #define URCU_FORCE_CAST(type, arg)	((type) (arg))
 #endif
 
-#define caa_is_signed_type(type)	(((type) (-1)) < 0)
+#define caa_is_signed_type(type)	((type) -1 < (type) 0)
 
-#define caa_cast_long_keep_sign(v)	\
-	(caa_is_signed_type(__typeof__(v)) ? (long) (v) : (unsigned long) (v))
+/*
+ * Sign-extend to long if needed, and output type is unsigned long.
+ */
+#define caa_cast_long_keep_sign(v)		\
+	(caa_is_signed_type(__typeof__(v)) ?	\
+		(unsigned long) (long) (v) :	\
+		(unsigned long) (v))
+
+/*
+ * Don't allow compiling with buggy compiler.
+ */
+
+#ifdef __GNUC__
+# define URCU_GCC_VERSION	(__GNUC__ * 10000 \
+				+ __GNUC_MINOR__ * 100 \
+				+ __GNUC_PATCHLEVEL__)
+
+/*
+ * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58854
+ */
+# ifdef __ARMEL__
+#  if URCU_GCC_VERSION >= 40800 && URCU_GCC_VERSION <= 40802
+#   error Your gcc version produces clobbered frame accesses
+#  endif
+# endif
+#endif
 
 #endif /* _URCU_COMPILER_H */