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diff --git a/src/grt/grt-errors.ads b/src/grt/grt-errors.ads
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+--  GHDL Run Time (GRT) - Error handling.
+--  Copyright (C) 2002 - 2014 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.
+--
+--  As a special exception, if other files instantiate generics from this
+--  unit, or you link this unit with other files to produce an executable,
+--  this unit does not by itself cause the resulting executable to be
+--  covered by the GNU General Public License. This exception does not
+--  however invalidate any other reasons why the executable file might be
+--  covered by the GNU Public License.
+with Grt.Types; use Grt.Types;
+with Grt.Hooks;
+
+package Grt.Errors is
+   pragma Preelaborate (Grt.Errors);
+
+   --  Multi-call error procedure.
+   --  Start and continue with Error_C, finish by an Error_E.
+   procedure Error_C (Str : String);
+   procedure Error_C (N : Integer);
+   procedure Error_C (Str : Ghdl_C_String);
+   procedure Error_C_Std (Str : Std_String_Uncons);
+   --procedure Error_C (Inst : Ghdl_Instance_Name_Acc);
+   procedure Error_E (Str : String := "");
+   -- procedure Error_E_Std (Str : Std_String_Uncons);
+   pragma No_Return (Error_E);
+
+   --  Multi-call report procedure.  Do not exit at end.
+   procedure Report_H (Str : String := "");
+   procedure Report_C (Str : Ghdl_C_String);
+   procedure Report_C (Str : String);
+   procedure Report_C (N : Integer);
+   procedure Report_Now_C;
+   procedure Report_E (Str : String);
+   procedure Report_E (Str : Std_String_Ptr);
+
+   --  Complete error message.
+   procedure Error (Str : String);
+
+   --  Internal error.  The message must contain the subprogram name which
+   --  has called this procedure.
+   procedure Internal_Error (Msg : String);
+   pragma No_Return (Internal_Error);
+
+   --  Display a message which is not an error.
+   procedure Info (Str : String);
+
+   --  Display an error message for an overflow.
+   procedure Grt_Overflow_Error;
+
+   --  Called at end of error message.  Central point for failures.
+   procedure Fatal_Error;
+   pragma No_Return (Fatal_Error);
+   pragma Export (C, Fatal_Error, "__ghdl_fatal");
+
+   Exit_Status : Integer := 0;
+   procedure Exit_Simulation;
+
+   --  Hook called in case of error.
+   Error_Hook : Grt.Hooks.Proc_Hook_Type := null;
+
+   --  If true, an error is expected and the exit status is inverted.
+   Expect_Failure : Boolean := False;
+
+private
+   pragma Export (C, Grt_Overflow_Error, "grt_overflow_error");
+
+   pragma No_Return (Error);
+end Grt.Errors;
+