--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/streamer-hooks.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,37 @@
+/* Streamer hooks.  Support for adding streamer-specific callbacks to
+   generic streaming routines.
+
+   Copyright (C) 2011-2017 Free Software Foundation, Inc.
+   Contributed by Diego Novillo <dnovillo@google.com>
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "streamer-hooks.h"
+
+/* Streamer hooks.  */
+struct streamer_hooks streamer_hooks;
+
+/* Initialize the current set of streamer hooks.  */
+
+void
+streamer_hooks_init (void)
+{
+  memset (&streamer_hooks, 0, sizeof (streamer_hooks));
+}