--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/libgnat/a-diocst.ads	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,54 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT RUN-TIME COMPONENTS                         --
+--                                                                          --
+--              A D A . D I R E C T _ I O . C _ S T R E A M S               --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--          Copyright (C) 1992-2017, 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.                                     --
+--                                                                          --
+-- 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 an interface between Ada.Direct_IO and the
+--  C streams. This allows sharing of a stream between Ada and C or C++,
+--  as well as allowing the Ada program to operate directly on the stream.
+
+with Interfaces.C_Streams;
+
+generic
+package Ada.Direct_IO.C_Streams is
+
+   package ICS renames Interfaces.C_Streams;
+
+   function C_Stream (F : File_Type) return ICS.FILEs;
+   --  Obtain stream from existing open file
+
+   procedure Open
+     (File     : in out File_Type;
+      Mode     : File_Mode;
+      C_Stream : ICS.FILEs;
+      Form     : String := "";
+      Name     : String := "");
+   --  Create new file from existing stream
+
+end Ada.Direct_IO.C_Streams;