--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/libgnat/g-comver.adb	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,72 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT COMPILER COMPONENTS                         --
+--                                                                          --
+--                G N A T . C O M P I L E R _ V E R S I O N                 --
+--                                                                          --
+--                                 B o d y                                  --
+--                                                                          --
+--                     Copyright (C) 2002-2010, AdaCore                     --
+--                                                                          --
+-- 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.                                     --
+--                                                                          --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception,   --
+-- version 3.1, as published by the Free Software Foundation.               --
+--                                                                          --
+-- You should have received a copy of the GNU General Public License and    --
+-- a copy of the GCC Runtime Library Exception along with this program;     --
+-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
+-- <http://www.gnu.org/licenses/>.                                          --
+--                                                                          --
+-- GNAT was originally developed  by the GNAT team at  New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc.      --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  This package provides a routine for obtaining the version number of the
+--  GNAT compiler used to compile the program. It relies on the generated
+--  constant in the binder generated package that records this information.
+
+package body GNAT.Compiler_Version is
+
+   Ver_Len_Max : constant := 256;
+   --  This is logically a reference to Gnatvsn.Ver_Len_Max but we cannot
+   --  import this directly since run-time units cannot WITH compiler units.
+
+   Ver_Prefix : constant String := "GNAT Version: ";
+   --  This is logically a reference to Gnatvsn.Ver_Prefix but we cannot
+   --  import this directly since run-time units cannot WITH compiler units.
+
+   GNAT_Version : constant String (1 .. Ver_Len_Max + Ver_Prefix'Length);
+   pragma Import (C, GNAT_Version, "__gnat_version");
+
+   -------------
+   -- Version --
+   -------------
+
+   function Version return String is
+   begin
+      --  Search for terminating right paren or NUL ending the string
+
+      for J in Ver_Prefix'Length + 1 .. GNAT_Version'Last loop
+         if GNAT_Version (J) = ')' then
+            return GNAT_Version (Ver_Prefix'Length + 1 .. J);
+         end if;
+
+         if GNAT_Version (J) = Character'Val (0) then
+            return GNAT_Version (Ver_Prefix'Length + 1 .. J - 1);
+         end if;
+      end loop;
+
+      --  This should not happen (no right paren or NUL found)
+
+      return GNAT_Version;
+   end Version;
+
+end GNAT.Compiler_Version;