linux-kernel - Re: Kconfig Q: expressing a modularity dependency

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Message-ID: <20090814163250.GD1626@ucw.cz>
Date:	Fri, 14 Aug 2009 18:32:51 +0200
From:	Pavel Machek <pavel@....cz>
To:	Tilman Schmidt <tilman@...p.cc>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Kconfig Q: expressing a modularity dependency

Hi!

> /me wrote, four months ago:
> > My current attempts to port the Gigaset driver from isdn4linux
> > to CAPI require the following Kconfig dependency:
> > 
> > - If isdn4linux or kernelcapi or both are built as a module
> >   (CONFIG_ISDN_I4L=m || CONFIG_ISDN_CAPI=m)
> >   then gigaset can only be built as a module
> >   (CONFIG_ISDN_DRV_GIGASET depends on m).
> > 
> > - If neither isdn4linux nor kernelcapi ar built as a module
> >   (CONFIG_ISDN_I4L!=m && CONFIG_ISDN_CAPI!=m),
> >   including the case that neither is being built at all
> >   (CONFIG_ISDN_I4L=n && CONFIG_ISDN_CAPI=n),
> >   then gigaset may be built statically or as a module
> >   (all three tristate settings for CONFIG_ISDN_DRV_GIGASET are
> >   legal).
> > 
> > How is that best expressed in Kconfig?
> 
> Judging from the complete silence following that question, the
> answer is, apparently: not at all.
> 
> So I'll just put a notice in the help text then, warning people
> not to set CONFIG_ISDN_DRV_GIGASET=y if their ISDN subsystem
> is built as a module. If anybody has a better idea I'll be
> glad to hear it.

That will break randconfig testing, AFAICT.

AFAIK Kconfig supports if statement just fine, so can you just

if something
	bool GIGASET
else
	tristate GIGASET

?

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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