--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/common/common-targhooks.h	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,34 @@
+/* Default common target hook functions.
+   Copyright (C) 2003-2017 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/>.  */
+
+#ifndef GCC_COMMON_TARGHOOKS_H
+#define GCC_COMMON_TARGHOOKS_H
+
+extern enum unwind_info_type default_except_unwind_info (struct gcc_options *);
+extern enum unwind_info_type dwarf2_except_unwind_info (struct gcc_options *);
+extern enum unwind_info_type sjlj_except_unwind_info (struct gcc_options *);
+
+extern bool default_target_handle_option (struct gcc_options *,
+					  struct gcc_options *,
+					  const struct cl_decoded_option *,
+					  location_t);
+
+extern const struct default_options empty_optimization_table[];
+
+#endif