--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/config/rs6000/genopt.sh	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,64 @@
+#!/bin/sh
+# Generate rs6000-tables.opt from the list of CPUs in rs6000-cpus.def.
+# 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/>.
+
+cat <<EOF
+; -*- buffer-read-only: t -*-
+; Generated automatically by genopt.sh from rs6000-cpus.def.
+
+; 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/>.
+
+Enum
+Name(rs6000_cpu_opt_value) Type(int)
+Known CPUs (for use with the -mcpu= and -mtune= options):
+
+EnumValue
+Enum(rs6000_cpu_opt_value) String(native) Value(RS6000_CPU_OPTION_NATIVE) DriverOnly
+
+EOF
+
+awk -F'[(, 	]+' '
+BEGIN {
+    value = 0
+}
+
+/^RS6000_CPU/ {
+    name = $2
+    gsub("\"", "", name)
+    print "EnumValue"
+    print "Enum(rs6000_cpu_opt_value) String(" name ") Value(" value ")"
+    print ""
+    value++
+}' $1/rs6000-cpus.def