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diff --git a/src/ortho/debug/ortho_ident_hash.ads b/src/ortho/debug/ortho_ident_hash.ads
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+++ b/src/ortho/debug/ortho_ident_hash.ads
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+--  Ortho debug hashed identifiers implementation.
+--  Copyright (C) 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.
+
+package Ortho_Ident_Hash is
+   type O_Ident is private;
+   O_Ident_Nul : constant O_Ident;
+
+   function Get_Identifier (Str : String) return O_Ident;
+   function Get_String (Id : O_Ident) return String;
+   function Is_Equal (L, R : O_Ident) return Boolean renames "=";
+   function Is_Equal (Id : O_Ident; Str : String) return Boolean;
+   function Is_Nul (Id : O_Ident) return Boolean;
+private
+   type Hash_Type is mod 2**32;
+
+   type String_Acc is access constant String;
+
+   --  Symbol table.
+   type Ident_Type;
+   type O_Ident is access Ident_Type;
+   type Ident_type is record
+      --  The hash for the symbol.
+      Hash : Hash_Type;
+      --  Identification of the symbol.
+      Ident : String_Acc;
+      --  Next symbol with the same collision.
+      Next : O_Ident;
+   end record;
+
+   O_Ident_Nul : constant O_Ident := null;
+end Ortho_Ident_Hash;