--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/switch-m.ads	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,82 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT COMPILER COMPONENTS                         --
+--                                                                          --
+--                             S W I T C H - M                              --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--          Copyright (C) 2001-2017, 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.  See the GNU General Public License --
+-- for  more details.  You should have  received  a copy of the GNU General --
+-- Public License  distributed with GNAT; see file COPYING3.  If not, go to --
+-- http://www.gnu.org/licenses for a complete copy of the license.          --
+--                                                                          --
+-- GNAT was originally developed  by the GNAT team at  New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc.      --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  This package scans make switches. Note that the body of Usage must be
+--  coordinated with the switches that are recognized by this package.
+--  The Usage package also acts as the official documentation for the
+--  switches that are recognized. In addition, package Debug documents
+--  the otherwise undocumented debug switches that are also recognized.
+
+pragma Warnings (Off);
+--  This package is used also by gnatcoll
+with System.OS_Lib; use System.OS_Lib;
+pragma Warnings (On);
+
+package Switch.M is
+
+   Subdirs : String_Ptr := null;
+   --  The value after the equal sign in switch --subdirs=...
+   --  Contains the relative subdirectory.
+
+   procedure Scan_Make_Switches
+     (Switch_Chars      : String;
+      Success           : out Boolean);
+   --  Scan a gnatmake switch and act accordingly. For switches that are
+   --  recognized, Success is set to True. A switch that is not recognized and
+   --  consists of one small letter causes a fatal error exit and control does
+   --  not return. For all other not recognized switches, Success is set to
+   --  False, so that the switch may be passed to the compiler.
+   --
+   --  Project_Node_Tree is used to store tree-specific parameters like the
+   --  project path.
+
+   procedure Normalize_Compiler_Switches
+     (Switch_Chars : String;
+      Switches     : in out Argument_List_Access;
+      Last         : out Natural);
+   --  Takes a compiler switch which potentially is equivalent to more
+   --  that one simple switches and returns the equivalent list of simple
+   --  switches that are stored in an ALI file. Switches will be extended
+   --  if initially null or too short. Last indicates the index in Switches
+   --  of the last simple switch. Last is equal to zero, if it has been
+   --  determined that Switch_Chars is ill-formed or does not contain any
+   --  switch that should be stored in an ALI file. Otherwise, the list of
+   --  simple switches is Switches (Switches'First .. Last).
+   --
+   --    Example: if Switch_Chars is equal to "-gnatAwue", then the list of
+   --    simple switches will have 3 components: -gnatA, -gnatwu, -gnatwe.
+   --
+   --  The String_Access components of Switches should not be deallocated:
+   --  they are shallow copies of components in a table in the body.
+
+   function Normalize_Compiler_Switches
+     (Switch_Chars : String) return Argument_List;
+   --  Similar to the previous procedure. The return value is the list of
+   --  simple switches. It may be an empty array if it has been determined
+   --  that Switch_Chars is ill-formed or does not contain any switch that
+   --  should be stored in an ALI file. The String_Access components of the
+   --  returned value should not be deallocated.
+
+end Switch.M;