--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/hostparm.ads	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,73 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT COMPILER COMPONENTS                         --
+--                                                                          --
+--                             H O S T P A R M                              --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--          Copyright (C) 1992-2014, 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 defines some system dependent parameters for GNAT. These
+--  are parameters that are relevant to the host machine on which the
+--  compiler is running, and thus this package is part of the compiler.
+
+with Types;
+
+package Hostparm is
+
+   ---------------------
+   -- HOST Parameters --
+   ---------------------
+
+   Direct_Separator : constant Character;
+   pragma Import (C, Direct_Separator, "__gnat_dir_separator");
+   Normalized_CWD : constant String := "." & Direct_Separator;
+   --  Normalized string to access current directory
+
+   Max_Line_Length : constant :=
+     Types.Column_Number'Pred (Types.Column_Number'Last);
+   --  Maximum source line length. By default we set it to the maximum
+   --  value that can be supported, which is given by the range of the
+   --  Column_Number type. We subtract 1 because need to be able to
+   --  have a valid Column_Number equal to Max_Line_Length to represent
+   --  the location of a "line too long" error.
+   --
+   --  200 is the minimum value required (RM 2.2(15)). The value set here
+   --  can be reduced by the explicit use of the -gnatyM style switch.
+
+   Max_Name_Length : constant := 1024;
+   --  Maximum length of unit name (including all dots, and " (spec)") and
+   --  of file names in the library, must be at least Max_Line_Length, but
+   --  can be larger.
+
+   Tag_Errors : constant Boolean := False;
+   --  If set to true, then brief form error messages will be prefaced by
+   --  the string "error:". Used as default for Opt.Unique_Error_Tag.
+
+   Exclude_Missing_Objects : constant Boolean := True;
+   --  If set to true, gnatbind will exclude from consideration all
+   --  non-existent .o files.
+
+end Hostparm;