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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Q: Multiple GNAT project files and object directories
Date: Wed, 10 Jul 2013 13:37:11 +0100
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Date: 2013-07-10T13:37:11+01:00
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Pascal Obry <pascal@obry.net> writes:

> Le 09/07/2013 23:42, Simon Wright a écrit :
>> Are you sure that GNAT will recompile the 'with'ed projects? I don't
>> believe I've ever seen it do so.
>
> Sure it does, except if the attribute Externally_Built is set. Or
> alternatively the .ali are set read-only.

It will rebuild if needed (the compiler has changed, or a source of the
'with'ed project has changed, or any other reason).

But it won't rebuild if this project is built with ("-g", "-O0") and the
'with'ed project is built with ("-O2"), which is the sort of change that
OP was talking about. (By "won't rebuild" I mean, I just tried it and it
didn't).