linux-kernel - Re: kbuild question

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Message-ID: <Pine.LNX.4.64.0702181811220.14457@scrub.home>
Date:	Sun, 18 Feb 2007 18:16:00 +0100 (CET)
From:	Roman Zippel <zippel@...ux-m68k.org>
To:	Kumar Gala <galak@...nel.crashing.org>
cc:	Sam Ravnborg <sam@...nborg.org>,
	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: kbuild question

Hi,

On Fri, 16 Feb 2007, Kumar Gala wrote:

> > Could you please be more specific about the problem you're trying to
> > solve, instead of how you're trying to solve it?
> > A real example would help a lot to understand the actual problem.
> 
> Sure, on powerpc for some of the embedded sub-architectures you can only
> select a single board to build for.  For a lot of people this is sufficient,
> however we are moving towards a world where you can easily build in support
> for multiple boards into a single kernel.
> 
> I'd like to have it such that if I'm only building support for one board
> (CONFIG_ONLY_HAVE_ONE, not going to call it that, but for this discussion its
> sufficient), you get a choice menu from Kconfig enforcing the ability to only
> select one board.  However if !CONFIG_ONLY_HAVE_ONE than you can select
> multiple boards to build into your kernel.
> 
> if CONFIG_ONLY_HAVE_ONE is set we can optimize out the runtime checks that get
> added for handling the multiple board case.

On m68k we have the same problem, but what I'm what I'm considering is to 
add a new mode for choice groups - at least one must be selected and 
kconfig generates the extra information if only one is selected.

bye, Roman
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