--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/libgnat/a-dirval.adb	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,104 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT RUN-TIME COMPONENTS                         --
+--                                                                          --
+--             A D A . D I R E C T O R I E S . V A L I D I T Y              --
+--                                                                          --
+--                                 B o d y                                  --
+--                             (POSIX Version)                              --
+--                                                                          --
+--          Copyright (C) 2004-2017, 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 is the POSIX version of this package
+
+package body Ada.Directories.Validity is
+
+   ---------------------------------
+   -- Is_Path_Name_Case_Sensitive --
+   ---------------------------------
+
+   function Is_Path_Name_Case_Sensitive return Boolean is
+   begin
+      return True;
+   end Is_Path_Name_Case_Sensitive;
+
+   ------------------------
+   -- Is_Valid_Path_Name --
+   ------------------------
+
+   function Is_Valid_Path_Name (Name : String) return Boolean is
+   begin
+      --  A path name cannot be empty and cannot contain any NUL character
+
+      if Name'Length = 0 then
+         return False;
+
+      else
+         for J in Name'Range loop
+            if Name (J) = ASCII.NUL then
+               return False;
+            end if;
+         end loop;
+      end if;
+
+      --  If Name does not contain any NUL character, it is valid
+
+      return True;
+   end Is_Valid_Path_Name;
+
+   --------------------------
+   -- Is_Valid_Simple_Name --
+   --------------------------
+
+   function Is_Valid_Simple_Name (Name : String) return Boolean is
+   begin
+      --  A file name cannot be empty and cannot contain a slash ('/') or
+      --  the NUL character.
+
+      if Name'Length = 0 then
+         return False;
+
+      else
+         for J in Name'Range loop
+            if Name (J) = '/' or else Name (J) = ASCII.NUL then
+               return False;
+            end if;
+         end loop;
+      end if;
+
+      --  If Name does not contain any slash or NUL, it is valid
+
+      return True;
+   end Is_Valid_Simple_Name;
+
+   -------------
+   -- Windows --
+   -------------
+
+   function Windows return Boolean is
+   begin
+      return False;
+   end Windows;
+
+end Ada.Directories.Validity;