--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/libgnat/g-stheme.adb	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,55 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT COMPILER COMPONENTS                         --
+--                                                                          --
+--                   GNAT.SOCKETS.THIN.HOST_ERROR_MESSAGES                  --
+--                                                                          --
+--                                 B o d y                                  --
+--                                                                          --
+--                     Copyright (C) 2007-2017, 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 is the default implementation of this unit, providing explicit
+--  literal messages (we do not use hstrerror from the standard C library,
+--  as this function is obsolete).
+
+separate (GNAT.Sockets.Thin)
+package body Host_Error_Messages is
+
+   function Host_Error_Message (H_Errno : Integer) return String is
+   begin
+      case H_Errno is
+         when SOSC.HOST_NOT_FOUND =>
+            return "Host not found";
+         when SOSC.TRY_AGAIN      =>
+            return "Try again";
+         when SOSC.NO_RECOVERY    =>
+            return "No recovery";
+         when SOSC.NO_DATA        =>
+            return "No address";
+         when others              =>
+            return "Unknown error";
+      end case;
+   end Host_Error_Message;
+
+end Host_Error_Messages;