--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/Woverlength-strings-pedantic-c99-ext.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,19 @@
+/* -Woverlength-strings complains about string constants which are too long
+   for the C standard's "minimum maximum" limits.  It is off by default,
+   but implied by -pedantic.  */
+
+/* { dg-options "-std=c99 -pedantic" } */
+
+#define TEN "xxxxxxxxxx"
+#define HUN TEN TEN TEN TEN TEN  TEN TEN TEN TEN TEN
+#define THO HUN HUN HUN HUN HUN  HUN HUN HUN HUN HUN
+
+/* C89's minimum-maximum is 509. */
+const char x510[] = HUN HUN HUN HUN HUN TEN;
+
+/* C99's minimum-maximum is 4095.  */
+const char x4096[] = __extension__
+  THO THO THO THO     /* 4000 */
+  TEN TEN TEN TEN TEN /* 4050 */
+  TEN TEN TEN TEN     /* 4090 */
+  "123456";