Define __SANITIZE_ADDRESS__ for -fsanitize=address

	PR c/55397
	* cppbuiltin.c (define_builtin_macros_for_compilation_flags):
	Define __SANITIZE_ADDRESS__ for flag_asan.

From-SVN: r193704

gcc/ChangeLog

+2012-11-21  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR c/55397
+	* cppbuiltin.c (define_builtin_macros_for_compilation_flags):
+	Define __SANITIZE_ADDRESS__ for flag_asan.
+
 2012-11-21  Wei Mi  <wmi@google.com>
 
 	* common.opt: Change faddress-sanitizer to fsanitize=address.

gcc/cppbuiltin.c

@@ -91,6 +91,9 @@ define_builtin_macros_for_compilation_flags (cpp_reader *pfile)
       cpp_define_formatted (pfile, "__PIE__=%d", flag_pie);
     }
 
+  if (flag_asan)
+    cpp_define (pfile, "__SANITIZE_ADDRESS__");
+
   if (optimize_size)
     cpp_define (pfile, "__OPTIMIZE_SIZE__");
   if (optimize)