re PR c/52769 (Unspecified designated initializer might not set to zero in some cases)

	PR c/52769
	* gcc.dg/pr52769.c: New test.

From-SVN: r217036

gcc/testsuite/ChangeLog

+2014-11-03  Marek Polacek  <polacek@redhat.com>
+
+	PR c/52769
+	* gcc.dg/pr52769.c: New test.
+
 2014-11-03  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/57820

gcc/testsuite/gcc.dg/pr52769.c

+/* PR c/52769 */
+/* { dg-do run } */
+/* { dg-options "-O3" } */
+
+typedef struct
+{
+  int should_be_zero;
+  char s[6];
+  int x;
+} foo_t;
+
+int
+main (void)
+{
+  volatile foo_t foo = {
+    .s = "123456",
+    .x = 2
+  };
+
+  if (foo.should_be_zero != 0)
+    __builtin_abort ();
+
+  return 0;
+}