--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/c-c++-common/Warray-bounds-6.c	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,18 @@
+/* PR tree-optimization/86614 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -Warray-bounds" } */
+
+extern char *strncpy (char *, const char *, __SIZE_TYPE__);
+
+void sink (void *);
+
+struct A { char b[17]; } a[2];
+
+void g (const char *s, unsigned n)
+{
+  int i = (char *)a[1].b - (char *)a + 1;
+  char *d = a[1].b;
+  /* Ensure the same bug is not diagnosed more than once.  */
+  strncpy (d + i, s, n);	/* { dg-warning "array subscript \[0-9]+ is outside array bounds of" } */
+				/* { dg-bogus "offset \[0-9]+ is out of the bounds \\\[0, \[0-9]+\\\] of object 'a' with type" "" { target *-*-* } .-1 } */
+}