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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Conditional Compilation in Ada
Newsgroups: comp.lang.ada
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Date: Mon, 29 Jun 2009 14:30:11 +0200
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Date: 2009-06-29T14:26:58+02:00
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On Mon, 29 Jun 2009 05:01:35 -0700 (PDT), Chrono wrote:

> Yes, I mean a GPS scenario. In my case it is a bit difficult to put
> files in a different folder for each scenario, due to I need to lead
> with a some thousands of files project.

But surely not all of them are scenario dependent.

> I used to have a solution with
> included a prepost compilation, a script launched before the unit
> compilation which turned up some part of the code to a commented one,
> so in "real" compilation, that part would not be compilated. I have a
> feeling that GPS has some way to do this without external scripts, a
> more ellegant solution, maybe using some compilation directives.
> My last implementation included some like this:

with Machine_Dependent_Constants;

> package body My_Package is
>   procedure Calculate_Data (My_Variable : out Some_Type) is
>   begin
>     --# if TARGET
>     MY_Variable = 1;

My_Variable :=  Machine_Dependent_Constants.My_Package_Constant;

>     --# end If TARGET
> 
>     --# if HOST
>     MY_Variable = 2;
>     --# end If HOST
>   end Calculate_Data;
> end My_Package;

You make a subdirectory for each platform and put a corresponding
implementation of Machine_Dependent_Constants.ads there. Then you go as
Simon have suggested.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de