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diff --git a/ortho/agcc/c.ads b/ortho/agcc/c.ads
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+--  Ada bindings for GCC internals.
+--  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 Ada.Unchecked_Conversion;
+with System;
+
+package C is
+   pragma Preelaborate (C);
+
+   --  Representation of a C String: this is an access to a bounded string.
+   --  Therefore, with GNAT, such an access is a thin pointer.
+   subtype Fat_C_String is String (Positive);
+   type C_String is access all Fat_C_String;
+   pragma Convention (C, C_String);
+
+   --  Convert an address to a C_STRING.
+   function To_C_String is new Ada.Unchecked_Conversion
+     (Source => System.Address, Target => C_String);
+
+   --  NULL for a string.
+   C_String_Null : constant C_String;
+
+   --  Convert an Ada access string to a C_String.
+   --  This simply takes the address of the first character of ACC.  This
+   --  is unchecked, so be careful with the life of ACC.
+   --  The last element of the string designated by ACC must be the NUL-char.
+   --  This is a little bit more restrictive than being only NUL-terminated.
+   function To_C_String (Acc : access String) return C_String;
+
+   --  Return the length of a C String (ie, the number of characters before
+   --  the Nul).
+   function C_String_Len (Str : C_String) return Natural;
+
+   --  An (very large) array of C String.  This is the type of ARGV.
+   type C_String_Array is array (Natural) of C_String;
+   pragma Convention (C, C_String_Array);
+
+   --  A structure for a string (len and address).
+   type C_Str_Len is record
+      Len : Natural;
+      Str : C_String;
+   end record;
+   pragma Convention (C_Pass_By_Copy, C_Str_Len);
+
+   type C_Str_Len_Acc is access C_Str_Len;
+
+   function Image (Str : C_Str_Len) return String;
+private
+   C_String_Null : constant C_String := null;
+end C;