--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/config/aarch64/aarch64-arches.def	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,38 @@
+/* Copyright (C) 2011-2017 Free Software Foundation, Inc.
+   Contributed by ARM Ltd.
+
+   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/>.  */
+
+/* Before using #include to read this file, define a macro:
+
+      AARCH64_ARCH(NAME, CORE, ARCH_IDENT, ARCH_REV, FLAGS)
+
+   The NAME is the name of the architecture, represented as a string
+   constant.  The CORE is the identifier for a core representative of
+   this architecture.  ARCH_IDENT is the architecture identifier.  It must be
+   unique and be syntactically valid to appear as part of an enum identifier.
+   ARCH_REV is an integer specifying the architecture major revision.
+   FLAGS are the flags implied by the architecture.
+   Due to the assumptions about the positions of these fields in config.gcc,
+   the NAME should be kept as the first argument and FLAGS as the last.  */
+
+AARCH64_ARCH("armv8-a",	      generic,	     8A,	8,  AARCH64_FL_FOR_ARCH8)
+AARCH64_ARCH("armv8.1-a",     generic,	     8_1A,	8,  AARCH64_FL_FOR_ARCH8_1)
+AARCH64_ARCH("armv8.2-a",     generic,	     8_2A,	8,  AARCH64_FL_FOR_ARCH8_2)
+AARCH64_ARCH("armv8.3-a",     generic,	     8_3A,	8,  AARCH64_FL_FOR_ARCH8_3)
+
+#undef AARCH64_ARCH