gc.c: disable AddressSanitizer

* gc.c (mark_locations_array): disable AddressSanitizer.  based on a
  patch by halfie (Ruby Guy) at [ruby-core:57372].
  [ruby-core:56155] [Bug #8680]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43047 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Thu Sep 26 14:46:49 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* gc.c (mark_locations_array): disable AddressSanitizer.  based on a
+	  patch by halfie (Ruby Guy) at [ruby-core:57372].
+	  [ruby-core:56155] [Bug #8680]
+
 Wed Sep 25 17:41:29 2013  Koichi Sasada  <ko1@atdot.net>
 
 	* README.EXT, README.EXT.ja: remove description of RARRAY_PTR()

gc.c

@@ -31,6 +31,16 @@
 #include <sys/types.h>
 #include <assert.h>
 
+#if /* is ASAN enabled? */ defined(__has_feature) ? \
+    __has_feature(address_sanitizer) /* Clang */ : \
+    defined(__SANITIZE_ADDRESS__)  /* GCC 4.8.x */
+  #define ATTRIBUTE_NO_ADDRESS_SAFETY_ANALYSIS \
+        __attribute__((no_address_safety_analysis)) \
+        __attribute__((noinline))
+#else
+  #define ATTRIBUTE_NO_ADDRESS_SAFETY_ANALYSIS
+#endif
+
 #ifdef HAVE_SYS_TIME_H
 #include <sys/time.h>
 #endif
@@ -2685,6 +2695,7 @@ ruby_stack_check(void)
 #endif
 }
 
+ATTRIBUTE_NO_ADDRESS_SAFETY_ANALYSIS
 static void
 mark_locations_array(rb_objspace_t *objspace, register VALUE *x, register long n)
 {