Move sources to src/ subdirectory.

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+--  Global flags.
+--  Copyright (C) 2002, 2003, 2004, 2005, 2008 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 GHDL; see the file COPYING.  If not, write to the Free
+--  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+--  02111-1307, USA.
+
+--  All the variables declared in this package are set by Parse_Option function
+--  and can by read as soon as the command line is parsed.
+--
+--  Since the names are not prefixed, this package is expected to be with'ed
+--  but not to be use'd.
+
+package Flags is
+   --  List of vhdl standards.
+   --  VHDL_93c is vhdl_93 with backward compatibility with 87 (file).
+   type Vhdl_Std_Type is
+     (Vhdl_87, Vhdl_93c, Vhdl_93, Vhdl_00, Vhdl_02, Vhdl_08);
+
+   --  Standard accepted.
+   Vhdl_Std: Vhdl_Std_Type := Vhdl_93c;
+
+   --  Enable AMS-VHDL extensions.
+   AMS_Vhdl : Boolean := False;
+
+   --  Some flags (such as vhdl version) must be the same for every design
+   --  units of a hierarchy.
+   --  The Flag_String is a signature of all these flags.
+   Flag_String : String (1 .. 5);
+   procedure Create_Flag_String;
+
+   -- If set, a multi-bytes sequence can appear in a comment, ie, all
+   -- characters except VT, CR, LF and FF are allowed in a comment.
+   -- Set by -C and --mb-comments
+   Mb_Comment: Boolean := False;
+
+   -- If set, relax rules about std library: working library can be std.
+   Bootstrap : Boolean := False;
+
+   --  Options -dX
+   --  -dp: disp tree after parsing
+   Dump_Parse: Boolean := False;
+
+   --  -ds: disp tree after semantic
+   Dump_Sem: Boolean := False;
+
+   --  -dc: disp tree after canon
+   Dump_Canon : Boolean := False;
+
+   --  -da: disp tree after annotation
+   Dump_Annotate: Boolean := False;
+
+   --  --dall: makes -dX options to apply to all files.
+   Dump_All: Boolean := False;
+
+   --  -dstats: disp statistics.
+   Dump_Stats : Boolean := False;
+
+   -- -lX options: list tree as a vhdl file.
+
+   -- --lall option: makes -lX options to apply to all files
+   List_All: Boolean := False;
+
+   -- -lv: list verbose
+   List_Verbose: Boolean := False;
+
+   -- -ls: list tree after semantic.
+   List_Sem: Boolean := False;
+
+   -- -lc: list tree after canon.
+   List_Canon: Boolean := False;
+
+   -- -la: list tree after back-end annotation.
+   List_Annotate: Boolean := False;
+
+   -- -v: disp phase of compilation.
+   Verbose : Boolean := False;
+
+   --  If set to true, it means that analyze is done for elaboration.
+   --  The purpose is to avoid spurious warning "will be checked
+   --  at elaboration"
+   Flag_Elaborate : Boolean := False;
+
+   --  If set, a default aspect entity aspect might be an outdated unit.
+   --  Used by ghdldrv.
+   Flag_Elaborate_With_Outdated : Boolean := False;
+
+   --  Do not display parse and sem warnings.  Used during elaboration.
+   Flag_Only_Elab_Warnings : Boolean := False;
+
+   --  If set, explicit subprogram declarations take precedence over
+   --  implicit declarations, even through use clauses.
+   Flag_Explicit : Boolean := False;
+
+   --  If set, use 'L.C' rule from VHDL02 to do default component binding.
+   Flag_Syn_Binding : Boolean := False;
+
+   --  If set, performs VITAL checks.
+   Flag_Vital_Checks : Boolean := True;
+
+   -- --time-resolution=X
+   -- Where X corresponds to:
+   -- fs => 'f'
+   -- ps => 'p'
+   -- ns => 'n'
+   -- us => 'u'
+   -- ms => 'm'
+   -- sec => 's'
+   -- min => 'M'
+   -- hr => 'h'
+   Time_Resolution: Character := 'f';
+
+   --  Integer and time types can be either 32 bits or 64 bits values.
+   --  The default is 32 bits for Integer and 64 bits for Time.
+   --  Be very careful: if you don't use the default sizes, you may have to
+   --  change other parts of your systems (such as GRT).
+   Flag_Integer_64 : Boolean := False;
+   Flag_Time_64 : Boolean := True;
+
+   --  If set, generate cross-references during sem.
+   Flag_Xref : Boolean := False;
+
+   --  If set, all the design units are analyzed in whole to do the simulation.
+   Flag_Whole_Analyze : Boolean := False;
+
+   --  If true, relax some rules:
+   --  * the scope of an object declaration names start after the declaration,
+   --    so that it is possible to use the old name in the default expression:
+   --    constant x : xtype := x;
+   Flag_Relaxed_Rules : Boolean := False;
+
+   -- --warn-undriven
+   --Warn_Undriven : Boolean := False;
+
+   --  --warn-default-binding
+   --  Should emit a warning when there is no default binding for a component
+   --  instantiation.
+   Warn_Default_Binding : Boolean := False;
+
+   --  --warn-binding
+   --  Emit a warning at elaboration for unbound component.
+   Warn_Binding : Boolean := True;
+
+   --  --warn-reserved
+   --  Emit a warning when a vhdl93 reserved word is used as a
+   --  vhdl87 identifier.
+   Warn_Reserved_Word : Boolean := False;
+
+   --  --warn-library
+   --  Emit a warning when a design unit redefines another design unit.
+   Warn_Library : Boolean := False;
+
+   --  --warn-vital-generic
+   --  Emit a warning when a generic of a vital entity is not a vital name.
+   Warn_Vital_Generic : Boolean := True;
+
+   --  --warn-delayed-checks
+   --  Emit warnings about delayed checks (checks performed at elaboration
+   --   time).
+   Warn_Delayed_Checks : Boolean := False;
+
+   --  --warn-body
+   --  Emit a warning when a package body is not required but is analyzed.
+   Warn_Body : Boolean := True;
+
+   --  --warn-specs
+   --  Emit a warning when an all/others specification does not apply, because
+   --  there is no such named entities.
+   Warn_Specs : Boolean := True;
+
+   --  --warn-unused
+   --  Emit a warning when a declaration is never used.
+   --  FIXME: currently only subprograms are handled.
+   Warn_Unused : Boolean := True;
+
+   --  --warn-error
+   --  Turns warnings into errors.
+   Warn_Error : Boolean := False;
+end Flags;