--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/wtr-strcat-1.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,18 @@
+/* Test for -Wtraditional warnings on string concatenation.
+   Note, gcc should omit these warnings in system header files.
+   By Kaveh R. Ghazi <ghazi@caip.rutgers.edu> 8/22/2000.  */
+/* { dg-do compile } */
+/* { dg-options "-Wtraditional" } */
+
+void
+testfunc ()
+{
+  const char *foo;
+  
+  foo = "hello" "hello"; /* { dg-warning "concatenation" "string concatenation" } */
+
+# 15 "sys-header.h" 3
+/* We are in system headers now, no -Wtraditional warnings should issue.  */
+
+  foo = "hello" "hello";
+}