--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/c/c-lang.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,72 @@
+/* Language-specific hook definitions for C front end.
+   Copyright (C) 1991-2017 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 "c-tree.h"
+#include "langhooks.h"
+#include "langhooks-def.h"
+#include "c-objc-common.h"
+
+enum c_language_kind c_language = clk_c;
+
+/* Lang hooks common to C and ObjC are declared in c-objc-common.h;
+   consequently, there should be very few hooks below.  */
+
+#undef LANG_HOOKS_NAME
+#define LANG_HOOKS_NAME "GNU C"
+#undef LANG_HOOKS_INIT
+#define LANG_HOOKS_INIT c_objc_common_init
+#undef LANG_HOOKS_INIT_TS
+#define LANG_HOOKS_INIT_TS c_common_init_ts
+
+#if CHECKING_P
+#undef LANG_HOOKS_RUN_LANG_SELFTESTS
+#define LANG_HOOKS_RUN_LANG_SELFTESTS selftest::run_c_tests
+#endif /* #if CHECKING_P */
+
+#undef LANG_HOOKS_GET_SUBSTRING_LOCATION
+#define LANG_HOOKS_GET_SUBSTRING_LOCATION c_get_substring_location
+
+/* Each front end provides its own lang hook initializer.  */
+struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;
+
+#if CHECKING_P
+
+namespace selftest {
+
+/* Implementation of LANG_HOOKS_RUN_LANG_SELFTESTS for the C frontend.  */
+
+void
+run_c_tests (void)
+{
+  /* Run selftests shared within the C family.  */
+  c_family_tests ();
+
+  /* Additional C-specific tests.  */
+}
+
+} // namespace selftest
+
+#endif /* #if CHECKING_P */
+
+
+#include "gtype-c.h"