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diff --git a/ortho/mcode/ortho_code-debug.ads b/ortho/mcode/ortho_code-debug.ads
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+++ b/ortho/mcode/ortho_code-debug.ads
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+--  Mcode back-end for ortho - Internal debugging.
+--  Copyright (C) 2006 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.Text_IO;
+
+package Ortho_Code.Debug is
+   package Int32_IO is new Ada.Text_IO.Integer_IO (Ortho_Code.Int32);
+
+   procedure Disp_Mode (M : Mode_Type);
+
+   --  Set a debug flag.
+   procedure Set_Debug_Be_Flag (C : Character);
+
+   --  any '--be-XXX=YY' option.
+   procedure Set_Be_Flag (Str : String);
+
+   --  c: tree created, before any back-end.
+   Flag_Disp_Code : Boolean := False;
+   Flag_Dump_Code : Boolean := False;
+
+   --  a: disp assembly code.
+   Flag_Debug_Asm : Boolean := False;
+
+   --  A: do internal checks (assertions).
+   Flag_Debug_Assert : Boolean := True;
+
+   --  b: disp top-level subprogram body before code generation.
+   Flag_Debug_Body : Boolean := False;
+
+   --  B: disp top-level subprogram body after code generation.
+   Flag_Debug_Body2 : Boolean := False;
+
+   --  c: display generated code.
+   Flag_Debug_Code : Boolean := False;
+
+   --  C: display generated code just before asm.
+   Flag_Debug_Code2 : Boolean := False;
+
+   --  h: disp bytes generated (in hexa).
+   Flag_Debug_Hex : Boolean := False;
+
+   --  H: generate high-level instructions.
+   Flag_Debug_Hli : Boolean := False;
+
+   --  r: raw dump, do not generate code.
+   Flag_Debug_Dump : Boolean := False;
+
+   --  i: disp insns, when generated.
+   Flag_Debug_Insn : Boolean := False;
+
+   --  s: disp stats (number of nodes).
+   Flag_Debug_Stat : Boolean := False;
+
+   --  k: keep all nodes in memory (do not free).
+   Flag_Debug_Keep: Boolean := False;
+end Ortho_Code.Debug;