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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Gnat 3.15p @ win-2000 recompiles _all_ internal packages ...
Date: Thu, 01 Jun 2006 07:41:12 +0100
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M E Leypold <development-2006-8ecbb5cc8a-REMOVETHIS@m-e-leypold.de> writes:

> Actually that is not what happens: Under Debian it works as I
> expected, but under Windows a lot of internal packages are recompiled
> to project-local *.ali and *.o files. It is almost as if gnatmake
> can't see the packages in .../lib/adalib/.

There was a problem with GNAT 3.16a1 on Windows which might also apply
to 3.15p; it had the amusing symptom that compilations with the -m
(minimal recompile) option ran much more slowly if the compiler was
installed in non-daylight saving time. So the simple fix was to set
the date to July, reinstall, then set the date back.

The problem was with apparent file timestamps; the installation
process ended up with the file timestamp being an hour out from the
.ali timestamp.

I think you might be able to just compile Ada.Containers with -gnatg
(-gnatpg? both?) and make the .ali files read-only; put the source and
object/ali files in an adainclude/adalib directory pair somewhere
separate from your main build.