--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/libgnat/a-wtcstr.adb	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,85 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                        GNAT RUN-TIME COMPONENTS                          --
+--                                                                          --
+--           A D A . W I D E _ T E X T _ I O . C _ S T R E A M S            --
+--                                                                          --
+--                                 B o d y                                  --
+--                                                                          --
+--          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.      --
+--                                                                          --
+------------------------------------------------------------------------------
+
+with Interfaces.C_Streams; use Interfaces.C_Streams;
+with System.File_IO;
+with System.File_Control_Block;
+with Ada.Unchecked_Conversion;
+
+package body Ada.Wide_Text_IO.C_Streams is
+
+   package FIO renames System.File_IO;
+   package FCB renames System.File_Control_Block;
+
+   subtype AP is FCB.AFCB_Ptr;
+
+   function To_FCB is new Ada.Unchecked_Conversion (File_Mode, FCB.File_Mode);
+
+   --------------
+   -- C_Stream --
+   --------------
+
+   function C_Stream (F : File_Type) return FILEs is
+   begin
+      FIO.Check_File_Open (AP (F));
+      return F.Stream;
+   end C_Stream;
+
+   ----------
+   -- Open --
+   ----------
+
+   procedure Open
+     (File     : in out File_Type;
+      Mode     : File_Mode;
+      C_Stream : FILEs;
+      Form     : String := "";
+      Name     : String := "")
+   is
+      Dummy_File_Control_Block : Wide_Text_AFCB;
+      pragma Warnings (Off, Dummy_File_Control_Block);
+      --  Yes, we know this is never assigned a value, only the tag
+      --  is used for dispatching purposes, so that's expected.
+
+   begin
+      FIO.Open (File_Ptr  => AP (File),
+                Dummy_FCB => Dummy_File_Control_Block,
+                Mode      => To_FCB (Mode),
+                Name      => Name,
+                Form      => Form,
+                Amethod   => 'W',
+                Creat     => False,
+                Text      => True,
+                C_Stream  => C_Stream);
+
+   end Open;
+
+end Ada.Wide_Text_IO.C_Streams;