merge revision(s) 26251:

	 * ruby.h (RB_GC_GUARD_PTR): workaround for gcc optimization.
	   [ruby-core:27402]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8_7@27408 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 7 insertions, 1 deletions

diff --git a/ruby.h b/ruby.h
index 00dad84bb9..f6e7ef478e 100644
--- a/ruby.h
+++ b/ruby.h
@@ -224,7 +224,13 @@ VALUE rb_ull2inum _((unsigned LONG_LONG));
 
 #define TYPE(x) rb_type((VALUE)(x))
 
-#define RB_GC_GUARD(v) (*(volatile VALUE *)&(v))
+#ifdef __GNUC__
+#define RB_GC_GUARD_PTR(ptr) \
+    __extension__ ({volatile VALUE *rb_gc_guarded_ptr = (ptr); rb_gc_guarded_ptr;})
+#else
+#define RB_GC_GUARD_PTR(ptr) (volatile VALUE *)(ptr)
+#endif
+#define RB_GC_GUARD(v) (*RB_GC_GUARD_PTR(&(v)))
 
 void rb_check_type _((VALUE,int));
 #define Check_Type(v,t) rb_check_type((VALUE)(v),t)