--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/attr-ms_struct-packed1.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,25 @@
+/* Test for MS structure with packed attribute.  */
+/* { dg-do run { target i?86-*-* x86_64-*-* } }
+/* { dg-options "-std=gnu99" } */
+
+extern void abort ();
+
+union u
+{
+  int a;
+} __attribute__((__ms_struct__, __packed__));
+
+struct s
+{
+  char c;
+  union u u;
+};
+
+int
+main (void)
+{
+  if (sizeof (struct s) != (sizeof (char) + sizeof (union u))) 
+    abort ();
+
+  return 0;
+}