--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/common/config/default-common.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,33 @@
+/* Default common target hooks initializer.
+   Copyright (C) 2011-2017 Free Software Foundation, Inc.
+
+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 "common/common-target.h"
+#include "common/common-target-def.h"
+
+/* Do not include tm.h or tm_p.h here; if it is useful for a target to
+   define some macros for the initializer in a header without defining
+   targetm_common itself (for example, because of interactions with
+   some hooks depending on the target OS and others on the target
+   architecture), create a separate tm_common.h for only the relevant
+   definitions.  */
+
+struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER;