--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/libgnat/s-strops.ads	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,56 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
+--                                                                          --
+--                    S Y S T E M . S T R I N G _ O P 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 contains functions for runtime operations on strings
+--  (other than runtime comparison, found in s-strcom.ads).
+
+--  NOTE: This package is obsolescent. It is no longer used by the compiler
+--  which now generates concatenation inline. It is retained only because
+--  it may be used during bootstrapping using old versions of the compiler.
+
+pragma Compiler_Unit_Warning;
+
+package System.String_Ops is
+   pragma Pure;
+
+   function Str_Concat (X, Y : String) return String;
+   --  Concatenate two strings and return resulting string
+
+   function Str_Concat_SC (X : String; Y : Character) return String;
+   --  Concatenate string and character
+
+   function Str_Concat_CS (X : Character; Y : String) return String;
+   --  Concatenate character and string
+
+   function Str_Concat_CC (X, Y : Character) return String;
+   --  Concatenate two characters
+
+end System.String_Ops;