Re: gnat: Execution_Time is not supported in this configuration

[Georg Bauhaus <rm.dash-bauhaus@futureapps.de>]

singo schrieb:

> I cannot get the package Ada.Execution_Time to work with gnat,
> although the gnat documentation says that the real-time annex is fully
> supported... I use the gnat version 4.4 on a Ubuntu 9.10 distribution.

The reason are explained in the GNAT source files.  The ones I have show
a note, after the � box:
------------------------------------------------------------------------------
--                                                                          --
--                         GNAT RUN-TIME COMPONENTS                         --
--                                                                          --
--                   A D A . E X E C U T I O N _ T I M E                    --
--                                                                          --
--                                 S p e c                                  --
--                                                                          --
-- This specification is derived from the Ada Reference Manual for use with --
-- GNAT.  In accordance with the copyright of that document, you can freely --
-- copy and modify this specification,  provided that if you redistribute a --
-- modified version,  any changes that you have made are clearly indicated. --
--                                                                          --
------------------------------------------------------------------------------

--  This unit is not implemented in typical GNAT implementations that lie on
--  top of operating systems, because it is infeasible to implement in such
--  environments.

--  If a target environment provides appropriate support for this package
--  then the Unimplemented_Unit pragma should be removed from this spec and
--  an appropriate body provided.

with Ada.Task_Identification;
with Ada.Real_Time;

package Ada.Execution_Time is
   pragma Preelaborate;

   pragma Unimplemented_Unit;