--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/Wstringop-overflow-17.c	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,19 @@
+/* Test to verify that -Wstringop-overflow mentions the referenced object
+   { dg-do compile }
+   { dg-options "-O2 -Wall" } */
+
+static void copy_n (char *d, const char *s, int n)
+{
+  while (n--)
+    *d++ = *s++;
+  *d = 0;           // { dg-warning "writing 1 byte into a region of size 0" }
+}
+
+void sink (void*);
+
+void call_copy_n (const char *s)
+{
+  char a[7];        // { dg-message "declared here" }
+  copy_n (a, "1234567", 7);
+  sink (a);
+}