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Date: Sat, 29 Dec 2001 12:23:37 -0800 (PST)
From: Linus Torvalds <torvalds@transmeta.com>
To: Keith Owens <kaos@ocs.com.au>
cc: Legacy Fishtank <garzik@havoc.gtf.org>, <linux-kernel@vger.kernel.org>,
        Larry McVoy <lm@bitmover.com>, "Eric S. Raymond" <esr@thyrsus.com>,
        Dave Jones <davej@suse.de>, Marcelo Tosatti <marcelo@conectiva.com.br>,
        <kbuild-devel@lists.sourceforge.net>
Subject: Re: State of the new config & build system 
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On Sat, 29 Dec 2001, Keith Owens wrote:
>
> Yes, some of the problems with mkdep can be fixed in the current design
> but there is one problem that is inherently unfixable.  make dep is a
> manual process so it relies on users knowing when they have to rerun
> make dep AND THEY DON'T DO IT!

Don't be silly.

Make the dependency file itself depend on all the files it describes, and
add a makefile rule to re-generate it. Poof, problem gone.

> Dependencies _do_ change when your .config changes,

Only if you do them wrong. Look at mkdep.c - it statically determines the
complete list of header files that _can_ be included, and does not care at
all about what config options there are.

> that are included varies.  gcc -MD gets this exactly right, gcc knows
> which files it read.

Bzzt, it knows the subset of files to read, nothing more.

		Linus

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