--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/builtin-object-size-15.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,27 @@
+/* { dg-do run } */
+/* { dg-options "-O2" } */
+
+extern void abort (void);
+
+int
+main ()
+{
+  struct A { char buf1[9]; char buf2[1]; } a;
+
+  if (__builtin_object_size (a.buf1 + (0 + 4), 1) != 5)
+    abort ();
+  char *p = a.buf1;
+  p += 1;
+  p += 3;
+  if (__builtin_object_size (p, 1) != 5)
+    abort ();
+  p = (char *) &a;
+  char *q = p + 1;
+  char *r = q + 3;
+  char *t = r;
+  if (r != (char *) &a + 4)
+    t = (char *) &a + 1;
+  if (__builtin_object_size (t, 1) != 6)
+    abort ();
+  return 0;
+}