--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/c99-bool-3.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,33 @@
+/* Test for _Bool bit-fields.  They have the semantics of _Bool, at
+   least for now (DR#335 Spring 2007 discussion).  */
+/* Origin: Joseph Myers <joseph@codesourcery.com> */
+/* { dg-do run } */
+/* { dg-options "-std=iso9899:1999 -pedantic-errors" } */
+struct foo
+{
+  _Bool a : 1;
+} sf;
+
+extern void abort (void);
+extern void exit (int);
+
+int
+main (void)
+{
+  int i;
+  for (i = 0; i < sizeof (struct foo); i++)
+    *((unsigned char *)&sf + i) = (unsigned char) -1;
+  sf.a = 2;
+  if (sf.a != 1)
+    abort ();
+  sf.a = 0;
+  if (sf.a != 0)
+    abort ();
+  sf.a = 0.2;
+  if (sf.a != 1)
+    abort ();
+  sf.a = &sf;
+  if (sf.a != 1)
+    abort ();
+  exit (0);
+}