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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Suggestion about best practice with .gpr files
Date: Sun, 30 May 2021 20:31:40 +0100
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Stephen Leake <stephen_leake@stephe-leake.org> writes:

> I do something similar; I put both foolib_test.gpr and foolib.gpr in a
> build directory with a Makefile, and they share an obj directory.

ISTR that it was forbidden for GPRs to share an object directory?

You're not alone in sharing them, GNAT-LLVM does the same. Personally I
do as OP does.