From: Adrian Bunk <bunk@kernel.org>
To: Jan Engelhardt <jengelh@computergmbh.de>
Cc: Trent Piepho <xyzzy@speakeasy.org>,
Mauro Carvalho Chehab <mchehab@infradead.org>,
Hans Verkuil <hverkuil@xs4all.nl>,
v4l-dvb-maintainer@linuxtv.org,
Marcin Slusarz <marcin.slusarz@gmail.com>,
linux-kernel@vger.kernel.org
Subject: Re: [v4l-dvb-maintainer] 2.6.25 regression: VIDEO_DEV=y/m, I2C=n compile error
Date: Mon, 28 Jan 2008 14:25:23 +0200 [thread overview]
Message-ID: <20080128122523.GH1001@does.not.exist> (raw)
In-Reply-To: <Pine.LNX.4.64.0801281314450.1185@fbirervta.pbzchgretzou.qr>
On Mon, Jan 28, 2008 at 01:17:10PM +0100, Jan Engelhardt wrote:
>
> On Jan 28 2008 01:05, Trent Piepho wrote:
>
> >Maybe the kernel headers should provide a couple macros for testing
> >configs, since people get it wrong over and over again?
> >
> >#define CONFIG_ON(x) (defined(CONFIG_##x) || defined(CONFIG_##x##_MODULE))
> >#define CONFIG_AVAIABLE(x) (defined(CONFIG_##x) || (defined(MODULE) && defined(CONFIG_##x##_MODULE)))
> ^AVAILABLE(x)
>
> What's the difference between these two?
>
> CONFIG_x_MODULE will never be defined if MODULE is not, so defined(MODULE)
> seems redundant.
>...
It's not redundant - x is the module you want to use something from, and
MODULE is defined when the code you are working on gets compiled as a
module.
cu
Adrian
--
"Is there not promise of rain?" Ling Tan asked suddenly out
of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed
next prev parent reply other threads:[~2008-01-28 12:25 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-27 18:52 Adrian Bunk
2008-01-28 0:33 ` Mauro Carvalho Chehab
2008-01-28 8:40 ` Adrian Bunk
2008-01-28 9:05 ` [v4l-dvb-maintainer] " Trent Piepho
2008-01-28 11:49 ` Mauro Carvalho Chehab
2008-01-28 12:12 ` Adrian Bunk
2008-01-28 12:22 ` Mauro Carvalho Chehab
2008-01-28 12:25 ` Mauro Carvalho Chehab
2008-01-29 16:38 ` Mauro Carvalho Chehab
2008-01-28 12:17 ` Jan Engelhardt
2008-01-28 12:25 ` Adrian Bunk [this message]
2008-02-01 19:24 ` Trent Piepho
2008-01-29 18:42 ` Mauro Carvalho Chehab
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