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From: Simon Wright <simon.j.wright@mac.com>
Newsgroups: comp.lang.ada
Subject: Re: Pragma for conditional compilation? (Ada 2005 vs. 95)
Date: Fri, 28 Sep 2007 21:04:14 +0100
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Date: 2007-09-28T21:04:14+01:00
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Pascal Obry <pascal@obry.net> writes:

> Note that some of the configuration management can be done directly with
> GNAT Project File. In this case:
>
>    type OS_Type is ("UNIX", "Windows_NT");
>    OS : OS_Type := external ("OS", "UNIX");
>
>    case OS is
>       when "Windows_NT" =>
>          for Implementation ("OS_Services")
>               use "os_services__win32.adb";
>       when "UNIX" =>
>          for Implementation ("OS_Services")
>               use "os_services__linux.adb";
>    end case;
>
> Note the double underscore to be sure that those files are not found
> automatically by the project file when storing the OS specific units
> with all the other sources.

I never realised you could do this .. and I thought I had read the
friendly manual, too. Thanks, Pascal!