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+--  GHDL Run Time (GRT) -  command line options.
+--  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.Lib; use Grt.Lib;
+
+package Grt.Options is
+   pragma Preelaborate (Grt.Options);
+
+   --  Name of the program, set by argv[0].
+   --  Must be set before calling DECODE.
+   Progname : Ghdl_C_String;
+
+   --  Arguments.
+   --  This mimics argc/argv of 'main'.
+   --  These must be set before calling DECODE.
+   Argc : Integer;
+
+   type Argv_Array_Type is array (Natural) of Ghdl_C_String;
+   type Argv_Type is access Argv_Array_Type;
+
+   Argv : Argv_Type;
+
+   --  Last option decoded.
+   --  Following arguments are reserved for the program.
+   Last_Opt : Integer;
+
+   --  Consistent flags used for analysis.
+   --  Format is "VVitr", where:
+   --    'VV' is the version (87, 93 or 08).
+   --    'i' is the integer size ('i' for 32 bits, 'I' for 64 bits).
+   --    't' is the time size ('t' for 32 bits, 'T' for 64 bits).
+   --    'r' is the resolution ('?' for to be set by the user, '-' for any).
+   Flag_String : constant String (1 .. 5);
+   pragma Import (C, Flag_String, "__ghdl_flag_string");
+
+   --  Display options help.
+   --  Should not be called directly.
+   procedure Help;
+
+   --  Status from Decode_Option.
+   type Decode_Option_Status is
+     (
+      --  Last option, next arguments aren't options.
+      Decode_Option_Last,
+
+      --  --help option, program shouldn't run.
+      Decode_Option_Help,
+
+      --  Option was successfuly decoded.
+      Decode_Option_Ok);
+
+   --  Decode option Option and set Status.
+   procedure Decode_Option
+     (Option : String; Status : out Decode_Option_Status);
+
+   --  Decode command line options.
+   --  If STOP is true, there nothing must happen (set by --help).
+   procedure Decode (Stop : out Boolean);
+
+   --  Set by --disp-time (and --trace-signals, --trace-processes) to display
+   --  time and deltas.
+   Disp_Time : Boolean := False;
+
+   --  Set by --trace-signals, to display signals after each cycle.
+   Trace_Signals : Boolean := False;
+
+   --  Set by --trace-processes, to display process name before being run.
+   Trace_Processes : Boolean := False;
+
+   --  Set by --disp-sig-types, to display signals and they types.
+   Disp_Sig_Types : Boolean := False;
+
+   Disp_Sources : Boolean := False;
+   Disp_Signals_Map : Boolean := False;
+   Disp_Signals_Table : Boolean := False;
+   Disp_Sensitivity : Boolean := False;
+
+   --  Set by --disp-order to diplay evaluation order of signals.
+   Disp_Signals_Order : Boolean := False;
+
+   --  Set by --stats to display statistics.
+   Flag_Stats : Boolean := False;
+
+   --  Set by --checks to do internal checks.
+   Checks : Boolean := False;
+
+   --  Level at which an assert stop the simulation.
+   Severity_Level : Integer := Failure_Severity;
+
+   --  How assertions are handled.
+   type Assert_Handling is
+     (Enable_Asserts,
+      Disable_Asserts_At_Time_0,
+      Disable_Asserts);
+
+   --  Handling of assertions from IEEE library.
+   Ieee_Asserts : Assert_Handling := Enable_Asserts;
+
+   --  Set by --stop-time=XXX to stop the simulation at or just after XXX.
+   --  (unit is fs in fact).
+   Stop_Time : Std_Time := Std_Time'Last;
+
+   --  Set by --stop-delta=XXX to stop the simulation after XXX delta cycles.
+   Stop_Delta : Natural := 5000;
+
+   --  The default stack size for non-sensitized processes.
+   Stack_Size : Natural := 8 * 1024;
+
+   --  The maximum stack size for non-sensitized processes.
+   Stack_Max_Size : Natural := 128 * 1024;
+
+   --  Set by --no-run
+   --  If set, do not simulate, only elaborate.
+   Flag_No_Run : Boolean := False;
+
+   type Activity_Mode is (Activity_All, Activity_Minimal, Activity_None);
+   Flag_Activity : Activity_Mode := Activity_Minimal;
+
+   --  Set by --thread=
+   --  Number of threads used to do the simulation.
+   --  1 mean no additionnal threads, 0 means as many threads as number of
+   --  CPUs.
+   Nbr_Threads : Natural := 1;
+
+   --  Set the time resolution.
+   --  Only call this subprogram if you are allowed to set the time resolution.
+   procedure Set_Time_Resolution (Res : Character);
+private
+   pragma Export (C, Stack_Size);
+   pragma Export (C, Stack_Max_Size);
+   pragma Export (C, Nbr_Threads, "grt_nbr_threads");
+end Grt.Options;