--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/Werror-6.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,16 @@
+/* { dg-do compile } */
+/* { dg-options "-Wattributes -Werror=address" } */
+/* { dg-message "some warnings being treated as errors" "" {target "*-*-*"} 0 } */
+/* Make sure -Werror=foo emits an error and not a warning */
+
+void grill ();
+void __attribute__((dj)) bar() { }	/* { dg-warning ".* attribute directive ignored" } */
+
+int i;
+
+void
+foo ()
+{
+  if (&i)	/* { dg-error ".* will always evaluate as 'true'" } */
+    grill ();
+}