--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/libgnat/a-szunau.ads	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,78 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                          GNAT RUN-TIME COMPONENTS                        --
+--                                                                          --
+--   A D A . S T R I N G S . W I D E _ W I D E _ U N B O U N D E D . A U X  --
+--                                                                          --
+--                                 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 child package of Ada.Strings.Wide_Wide_Unbounded provides some
+--  specialized access functions which are intended to allow more efficient
+--  use of the facilities of Ada.Strings.Wide_Wide_Unbounded, particularly by
+--  other layered utilities.
+
+package Ada.Strings.Wide_Wide_Unbounded.Aux is
+   pragma Preelaborate;
+
+   subtype Big_Wide_Wide_String is Wide_Wide_String (Positive);
+   type Big_Wide_Wide_String_Access is access all Big_Wide_Wide_String;
+
+   procedure Get_Wide_Wide_String
+     (U : Unbounded_Wide_Wide_String;
+      S : out Big_Wide_Wide_String_Access;
+      L : out Natural);
+   pragma Inline (Get_Wide_Wide_String);
+   --  This procedure returns the internal string pointer used in the
+   --  representation of an unbounded string as well as the actual current
+   --  length (which may be less than S.all'Length because in general there
+   --  can be extra space assigned). The characters of this string may be
+   --  not be modified via the returned pointer,  and are valid only as
+   --  long as the original unbounded string is not accessed or modified.
+   --
+   --  This procedure is more efficient than the use of To_Wide_Wide_String
+   --  since it avoids the need to copy the string. The lower bound of the
+   --  referenced string returned by this call is always one, so the actual
+   --  string data is always accessible as S (1 .. L).
+
+   procedure Set_Wide_Wide_String
+     (UP : out Unbounded_Wide_Wide_String;
+      S  : Wide_Wide_String)
+      renames Set_Unbounded_Wide_Wide_String;
+   --  This function sets the string contents of the referenced unbounded
+   --  string to the given string value. It is significantly more efficient
+   --  than the use of To_Unbounded_Wide_Wide_String with an assignment, since
+   --  it avoids the necessity of messing with finalization chains. The lower
+   --  bound of the string S is not required to be one.
+
+   procedure Set_Wide_Wide_String
+     (UP : in out Unbounded_Wide_Wide_String;
+      S  : Wide_Wide_String_Access);
+   pragma Inline (Set_Wide_Wide_String);
+   --  This version of Set_Wide_Wide_String takes a string access value, rather
+   --  than string. The lower bound of the string value is required to be one,
+   --  and this requirement is not checked.
+
+end Ada.Strings.Wide_Wide_Unbounded.Aux;