Fix: silence gcc -Wextra warning

It appears that just casting to "unsigned long" already has the semantic
we are looking for (checked by reading C99 standard and
experimentation): it sign-extends smaller signed integers, and does not
sign-extend unsigned integers.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

diff --git a/urcu/compiler.h b/urcu/compiler.h
index 074e70026a056cab15d1b05b7537ac333c2daedf..e7817dbd019f8803abea56cd54fd749ebe6279d6 100644 (file)
--- a/urcu/compiler.h
+++ b/urcu/compiler.h
@@ -89,12 +89,11 @@
 #define caa_is_signed_type(type)       ((type) -1 < (type) 0)
 
 /*
- * Sign-extend to long if needed, and output type is unsigned long.
+ * Cast to unsigned long, sign-extending if @v is signed.
+ * Note: casting to a larger type or to same type size keeps the sign of
+ * the expression being cast (see C99 6.3.1.3).
  */
-#define caa_cast_long_keep_sign(v)             \
-       (caa_is_signed_type(__typeof__(v)) ?    \
-               (unsigned long) (long) (v) :    \
-               (unsigned long) (v))
+#define caa_cast_long_keep_sign(v)     ((unsigned long) (v))
 
 /*
  * Don't allow compiling with buggy compiler.