lfstack: Implement mutex-free stack head with transparent union (v2)

[urcu.git] / urcu / compiler.h

diff --git a/urcu/compiler.h b/urcu/compiler.h
index 0c6ece252ca0e8bee2a480ab45588bb8ccd15bcd..1e309035a9313e1540ada18c95b1da4d444c399b 100644 (file)
--- a/urcu/compiler.h
+++ b/urcu/compiler.h
@@ -70,7 +70,7 @@
        })
 
 #define CAA_BUILD_BUG_ON_ZERO(cond) (sizeof(struct { int:-!!(cond); }))
-#define CAA_BUILD_BUG_ON(cond) ((void)BUILD_BUG_ON_ZERO(cond))
+#define CAA_BUILD_BUG_ON(cond) ((void)CAA_BUILD_BUG_ON_ZERO(cond))
 
 /*
  * __rcu is an annotation that documents RCU pointer accesses that need
@@ -86,9 +86,45 @@
 #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))
+
+#if defined (__GNUC__) \
+       && ((__GNUC_MAJOR__ == 4) && (__GNUC_MINOR__ >= 5)      \
+               || __GNUC_MAJOR__ >= 5)
+#define CDS_DEPRECATED(msg)    \
+       __attribute__((deprecated(msg)))
+#else
+#define CDS_DEPRECATED(msg)    \
+       __attribute__((deprecated))
+#endif
+
+#define CAA_ARRAY_SIZE(x)      (sizeof(x) / sizeof((x)[0]))
+
+/*
+ * 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 */