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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Two questions about gpr files
Date: Sat, 05 Apr 2014 12:19:51 +0100
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Date: 2014-04-05T12:19:51+01:00
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mockturtle <framefritti@gmail.com> writes:

> I could solve those two problems if it was possible to find within the
> *.gpr file the type of system and if a given project file is present.
> For example, with something like
>
>   case OS is
>     when "Linux" =>
>       OS_Dependent_Source_Dir := "src/linux";
>
>     when "Windows" =>
>       OS_Dependent_Source_Dir := "src/win";
>   end case;

You might find "aggregate projects" useful, especially the last part of
section 1.7.3.

http://docs.adacore.com/gprbuild-docs/html/gprbuild_ug.html#Define-a-build-environment