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diff --git a/src/grt/grt-wave_opt.adb b/src/grt/grt-wave_opt.adb
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+++ b/src/grt/grt-wave_opt.adb
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+--  GHDL Run Time (GRT) - Wave option file top package.
+--  Copyright (C) 2016 Jonas Baggett
+--
+--  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.
+
+-- Description: See package specifications
+
+with Grt.Errors; use Grt.Errors;
+
+package body Grt.Wave_Opt is
+
+   procedure Print_Context
+     (Lineno, Column : Positive; Severity : Severity_Type) is
+   begin
+      case Severity is
+         when Error =>
+            Error_C ("");
+         when Warning =>
+            Report_C ("warning: ");
+      end case;
+      Report_C (File_Path.all);
+      Report_C (":");
+      Report_C (Lineno);
+      Report_C (":");
+      Report_C (Column);
+      Report_C (": ");
+   end Print_Context;
+
+   procedure Print_Context (Element : Elem_Acc; Severity : Severity_Type) is
+   begin
+      Print_Context
+        (Element.Path_Context.Lineno, Element.Column, Severity);
+   end Print_Context;
+
+   procedure Error_Context (Msg : String;
+                            Lineno, Column : Positive;
+                            Severity : Severity_Type := Error) is
+   begin
+      Print_Context (Lineno, Column, Severity);
+      case Severity is
+         when Error =>
+            Error_E (Msg);
+         when Warning =>
+            Report_E (Msg);
+      end case;
+   end Error_Context;
+
+   procedure Error_Context
+     (Msg : String; Element : Elem_Acc; Severity : Severity_Type := Error) is
+   begin
+      Error_Context
+        (Msg, Element.Path_Context.Lineno, Element.Column, Severity);
+   end Error_Context;
+
+end Grt.Wave_Opt;