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diff --git a/translate/grt/grt-stack2.ads b/translate/grt/grt-stack2.ads
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+--  GHDL Run Time (GRT) - secondary stack.
+--  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 System;
+with Grt.Types; use Grt.Types;
+
+--  Secondary stack management.
+package Grt.Stack2 is
+   type Stack2_Ptr is new System.Address;
+   Null_Stack2_Ptr : constant Stack2_Ptr := Stack2_Ptr (System.Null_Address);
+
+   type Mark_Id is new Integer_Address;
+
+   function Mark (S : Stack2_Ptr) return Mark_Id;
+   procedure Release (S : Stack2_Ptr; Mark : Mark_Id);
+   function Allocate (S : Stack2_Ptr; Size : Ghdl_Index_Type)
+     return System.Address;
+   function Create return Stack2_Ptr;
+
+   --  Check S is empty.
+   procedure Check_Empty (S : Stack2_Ptr);
+end Grt.Stack2;