Cleanup: remove leftover manual pthread detection

[urcu.git] / urcu / compiler.h

diff --git a/urcu/compiler.h b/urcu/compiler.h
index 2e0237e15194d01953fa8d5792c9194acb270a08..511dbdf302456d46329bce98e1147b7c34a51543 100644 (file)
--- a/urcu/compiler.h
+++ b/urcu/compiler.h
@@ -64,6 +64,7 @@
  * @member: name of the field within the object.
  */
 #define caa_container_of(ptr, type, member)                            \
+       __extension__                                                   \
        ({                                                              \
                const __typeof__(((type *) NULL)->member) * __ptr = (ptr); \
                (type *)((char *)__ptr - offsetof(type, member));       \
@@ -89,12 +90,11 @@
 #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))
 
 #if defined (__GNUC__) \
        && ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 5)    \