* atomic.h(ATOMIC_SET): add cast to void to prevent misuse.

  [ruby-dev:44596] [Bug ruby#5439]



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@33462 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Thu Oct 13 18:13:04 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
+
+	* atomic.h(ATOMIC_SET): add cast to void to prevent misuse.
+	  [ruby-dev:44596] [Bug #5439]
+
 Thu Oct 13 18:04:27 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* gc.c (rb_gc_finalize_deferred, rb_objspace_call_finalizer):

atomic.h

@@ -36,7 +36,7 @@ rb_w32_atomic_or(volatile rb_atomic_t *var, rb_atomic_t val)
  * http://gcc.gnu.org/onlinedocs/gcc/Atomic-Builtins.html */
 
 typedef unsigned int rb_atomic_t; /* Anything OK */
-# define ATOMIC_SET(var, val)  __sync_lock_test_and_set(&(var), (val))
+# define ATOMIC_SET(var, val)  (void)__sync_lock_test_and_set(&(var), (val))
 # define ATOMIC_INC(var) __sync_fetch_and_add(&(var), 1)
 # define ATOMIC_DEC(var) __sync_fetch_and_sub(&(var), 1)
 # define ATOMIC_OR(var, val) __sync_or_and_fetch(&(var), (val))
@@ -46,7 +46,7 @@ typedef unsigned int rb_atomic_t; /* Anything OK */
 typedef int rb_atomic_t;
 extern rb_atomic_t ruby_atomic_exchange(rb_atomic_t *ptr, rb_atomic_t val);
 
-# define ATOMIC_SET(var, val) ((var) = (val))
+# define ATOMIC_SET(var, val) (void)((var) = (val))
 # define ATOMIC_INC(var) (++(var))
 # define ATOMIC_DEC(var) (--(var))
 # define ATOMIC_OR(var, val) ((var) |= (val))