linux-kernel - Re: [PATCH] kconfig: use $K64BIT to set 64BIT with all*config targets

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Date:	Sun, 11 Nov 2007 15:59:54 +0100
From:	"Guillaume Chazarain" <guichaz@...oo.fr>
To:	"Adrian Bunk" <bunk@...nel.org>
Cc:	"Sam Ravnborg" <sam@...nborg.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kconfig: use $K64BIT to set 64BIT with all*config targets

On 11/11/07, Adrian Bunk <bunk@...nel.org> wrote:
> Another important point is that users that know about and see CONFIG_*
> variables are kernel hackers, not the normal kconfig users.

But kconfig is mainly for kernel hackers, otherwise it would be
called CML2 ;-)

> > Also, when working on a specific feature of the kernel, I tend to
> > install both a kernel with the CONFIG_ option set and one with
> > the option unset. Scripts to do that can twiddle the .config file,
> > but it would be more convenient if kbuild could avoid that.
>
> I'm wondering why you don't use two different O= output directories
> instead?
>
> Depending on the CONFIG_ option in question this might even greatly
> reduce your compile times.

/me is filled with wonder at the discovery that .config is saved in the O=
directory. Thanks a lot Adrian for this time saver. So it's not strictly an
output directory, more a build directory.

I still think "make oldconfig CONFIG_FOO=bar" is useful for the occasional
config change, but thanks again for this great tip.

-- 
Guillaume
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