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Date: Sun, 15 Aug 2021 09:00:39 -0700 (PDT)
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Subject: Re: Raising "exception" in a .gpr file
From: Mark Lorenzen <mark.lorenzen@gmail.com>
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On Friday, August 13, 2021 at 5:40:05 PM UTC+2, bj=C3=B6rn lundin wrote:
> project Environment is=20
> for Source_Dirs use (); -- to avoid warnings about no source files in=20
> THIS project=20

You can declare the project as "abstract" and then you do not need to defin=
e Source_Dirs i.e:

abstract project Environment is
...
end Environment;

See https://docs.adacore.com/gprbuild-docs/html/gprbuild_ug/gnat_project_ma=
nager.html#sharing-between-projects

Regards,
Mark L