--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ssa.h	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,33 @@
+/* Common SSA files
+   Copyright (C) 2015-2017 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_SSA_H
+#define GCC_SSA_H
+
+/* This is an aggregation header file. This means it should contain only
+   other include files.  */
+
+#include "stringpool.h"
+#include "gimple-ssa.h"
+#include "tree-vrp.h"
+#include "tree-ssanames.h"
+#include "tree-phinodes.h"
+#include "ssa-iterators.h" 
+
+#endif  /* GCC_SSA_H  */