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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Conditional compilation of debug traces without cpp
Date: Tue, 04 Jul 2006 21:54:05 +0100
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guillaume.portail@grospied.enanglais.com writes:

> Debug.Enabled is a compile time constant, so with a bit of -O3 pragma
> Inline or other (-gnatN), the binary implementation of Debug.Put_Line
> will be null.

I don't think you need more than -O2 for this magic to work. But it's
a promise made by GNAT, other compilers may behave differently.

You could check out gnatprep, I suppose.