--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/adabkend.ads	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,52 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT COMPILER COMPONENTS                         --
+--                                                                          --
+--                              A D A B K E N D                             --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--          Copyright (C) 1992-2012, Free Software Foundation, Inc.         --
+--                                                                          --
+-- GNAT is free software;  you can  redistribute it  and/or modify it under --
+-- terms of the  GNU General Public License as published  by the Free Soft- --
+-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
+-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT 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  distributed with GNAT; see file COPYING3.  If not, go to --
+-- http://www.gnu.org/licenses for a complete copy of the license.          --
+--                                                                          --
+-- GNAT was originally developed  by the GNAT team at  New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc.      --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  Generic package implementing the common parts of back_end.adb for back ends
+--  written in Ada, thereby reducing code duplication.
+
+with Types;
+
+generic
+   Product_Name    : String;
+   Copyright_Years : String;
+
+   with procedure Driver (Root : Types.Node_Id);
+   --  Main driver procedure for back end
+
+   with function Is_Back_End_Switch (Switch : String) return Boolean;
+   --  Back-end specific function to determine validity of switches
+
+package Adabkend is
+
+   procedure Call_Back_End;
+   --  Call back end, i.e. make call to the Driver passing the root
+   --  node for this compilation unit.
+
+   procedure Scan_Compiler_Arguments;
+   --  Acquires command-line parameters passed to the compiler and processes
+   --  them. Calls Scan_Front_End_Switches for any front-end switches
+   --  encountered. See spec of Back_End for more details.
+
+end Adabkend;