linux-kernel - Re: Kconfig troubles when using menuconfig - Was: [patch]Re: [linux-usb-devel] linux-2.6.22-rc5-gf1518a0 build #300 failed in zc0301

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Message-ID: <Pine.LNX.4.64.0706221735270.1817@scrub.home>
Date:	Fri, 22 Jun 2007 18:24:16 +0200 (CEST)
From:	Roman Zippel <zippel@...ux-m68k.org>
To:	Jan Engelhardt <jengelh@...putergmbh.de>
cc:	Mauro Carvalho Chehab <mchehab@...radead.org>,
	Oliver Neukum <oneukum@...e.de>,
	linux-usb-devel@...ts.sourceforge.net, video4linux-list@...hat.com,
	Toralf Förster <toralf.foerster@....de>,
	luca.risolia@...dio.unibo.it, LKML <linux-kernel@...r.kernel.org>
Subject: Re: Kconfig troubles when using menuconfig - Was: [patch]Re:
 [linux-usb-devel] linux-2.6.22-rc5-gf1518a0 build #300 failed in zc0301_core.c

Hi,

On Fri, 22 Jun 2007, Jan Engelhardt wrote:

> V4L_USB_DRIVERS=y turns USB into =y? That can't be. It should give the "this
> depends on another symbol [USB] that is modular".

That's not how it works, the enclosed symbols depend now on 
V4L_USB_DRIVERS, which is a boolean and it can only have two states.
It doesn't matter on what V4L_USB_DRIVERS depends only the final value 
matters.
(BTW if check the dependency debug output in menuconfig/xconfig, you'll 
see which values are relevant in the calculation of a symbol value.)

> >I'm also a little irritated by the "default y", if I enable V4L I'm very 
> >tempted to check what other useless stuff has been automatically enabled, 
> >which I have to turn off again.
> 
> The default y only applies to the "menu" folders, not actual code.

I don't know that without checking the Makefile.

> There have been discussions to remove the default-ys again, I've sent a patch
> [http://lkml.org/lkml/2007/5/12/216], but nothing happened.
> 
> So, should all affected menuconfigs be transformed into tristates, what 
> do you think, Roman? Let me know so I can cook up a patch (hopefully 
> before 2.6.22) should they become tristate.

Using bool is clearly a bug and I'd prefer if it removed the defaults as 
well.

bye, Roman
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