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diff --git a/src/ghdldrv/ghdlmain.ads b/src/ghdldrv/ghdlmain.ads
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+--  GHDL driver - main part.
+--  Copyright (C) 2002, 2003, 2004, 2005 Tristan Gingold
+--
+--  GHDL is free software; you can redistribute it and/or modify it under
+--  the terms of the GNU General Public License as published by the Free
+--  Software Foundation; either version 2, or (at your option) any later
+--  version.
+--
+--  GHDL is distributed in the hope that it will be useful, but WITHOUT 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
+--  along with GCC; see the file COPYING.  If not, write to the Free
+--  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+--  02111-1307, USA.
+with GNAT.OS_Lib; use GNAT.OS_Lib;
+with Errorout;
+
+package Ghdlmain is
+   type Command_Type;
+
+   type Command_Acc is access all Command_Type'Class;
+
+   type Command_Type is abstract tagged record
+      Next : Command_Acc;
+   end record;
+
+   --  Return TRUE iff CMD handle action ACTION.
+   function Decode_Command (Cmd : Command_Type; Name : String) return Boolean
+     is abstract;
+
+   --  Initialize the command, before decoding actions.
+   procedure Init (Cmd : in out Command_Type);
+
+   --  Option_OK: OPTION is handled.
+   --  Option_Bad: OPTION is unknown.
+   --  Option_Arg_Req: OPTION requires an argument.  Must be set only when
+   --     ARG = "", the manager will recall Decode_Option.
+   --  Option_Arg: OPTION used the argument.
+   type Option_Res is
+     (Option_Bad, Option_Ok, Option_Arg, Option_Arg_Req, Option_End);
+   procedure Decode_Option (Cmd : in out Command_Type;
+                            Option : String;
+                            Arg : String;
+                            Res : out Option_Res);
+
+   --  Get a one-line help for the command.
+   function Get_Short_Help (Cmd : Command_Type) return String
+     is abstract;
+
+   --  Disp detailled help.
+   procedure Disp_Long_Help (Cmd : Command_Type);
+
+   --  Perform the action.
+   procedure Perform_Action (Cmd : in out Command_Type; Args : Argument_List)
+     is abstract;
+
+   --  Register a command.
+   procedure Register_Command (Cmd : Command_Acc);
+
+   --  Disp MSG on the standard output with the command name.
+   procedure Error (Msg : String);
+
+   --  May be raise by perform_action if the arguments are bad.
+   Option_Error : exception renames Errorout.Option_Error;
+
+   --  Action failed.
+   Compile_Error : exception;
+
+   --  Exec failed: either the program was not found, or failed.
+   Exec_Error : exception;
+
+   procedure Main;
+
+   --  Additionnal one-line message displayed by the --version command,
+   --  if defined.
+   --  Used to customize.
+   type String_Cst_Acc is access constant String;
+   Version_String : String_Cst_Acc := null;
+
+   --  Registers all commands in this package.
+   procedure Register_Commands;
+end Ghdlmain;