First import from sources

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diff --git a/post_sems.adb b/post_sems.adb
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+--  Global checks after semantization pass.
+--  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 Types; use Types;
+with Std_Names; use Std_Names;
+with Ieee.Std_Logic_1164;
+with Ieee.Vital_Timing;
+with Flags; use Flags;
+
+package body Post_Sems is
+   procedure Post_Sem_Checks (Unit : Iir_Design_Unit)
+   is
+      Lib_Unit : Iir;
+      Lib : Iir_Library_Declaration;
+      Id : Name_Id;
+
+      Value : Iir_Attribute_Value;
+      Spec : Iir_Attribute_Specification;
+      Attr_Decl : Iir_Attribute_Declaration;
+   begin
+      Lib_Unit := Get_Library_Unit (Unit);
+      Id := Get_Identifier (Lib_Unit);
+      Lib := Get_Library (Get_Design_File (Unit));
+
+      if Get_Identifier (Lib) = Name_Ieee then
+         --  This is a unit of IEEE.
+         if Get_Kind (Lib_Unit) = Iir_Kind_Package_Declaration then
+            if Id = Name_Std_Logic_1164 then
+               Ieee.Std_Logic_1164.Extract_Declarations (Lib_Unit);
+            elsif Id = Name_VITAL_Timing then
+               Ieee.Vital_Timing.Extract_Declarations (Lib_Unit);
+            end if;
+         end if;
+      end if;
+
+      --  Look for VITAL attributes.
+      if Flag_Vital_Checks then
+         Value := Get_Attribute_Value_Chain (Unit);
+         while Value /= Null_Iir loop
+            Spec := Get_Attribute_Specification (Value);
+            Attr_Decl := Get_Attribute_Designator (Spec);
+            if Attr_Decl = Ieee.Vital_Timing.Vital_Level0_Attribute then
+               Ieee.Vital_Timing.Check_Vital_Level0 (Unit);
+            elsif Attr_Decl = Ieee.Vital_Timing.Vital_Level1_Attribute then
+               Ieee.Vital_Timing.Check_Vital_Level1 (Unit);
+            end if;
+
+            Value := Get_Chain (Value);
+         end loop;
+      end if;
+   end Post_Sem_Checks;
+end Post_Sems;
+