linux-kernel - Re: [patch] dvb: build failure fix

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Message-ID: <20080430161712.50d1fc84@gaivota>
Date:	Wed, 30 Apr 2008 16:17:12 -0300
From:	Mauro Carvalho Chehab <mchehab@...radead.org>
To:	mkrufky@...uxtv.org
Cc:	bunk@...nel.org, mingo@...e.hu, linux-kernel@...r.kernel.org
Subject: Re: [patch] dvb: build failure fix

On Mon, 28 Apr 2008 17:29:49 -0400
mkrufky@...uxtv.org wrote:

> Mauro Carvalho Chehab wrote:
> > On Tue, 29 Apr 2008 00:01:22 +0300
> > Adrian Bunk <bunk@...nel.org> wrote:
> >
> >   
> >> On Mon, Apr 28, 2008 at 09:53:30PM +0200, Ingo Molnar wrote:
> >>     
> >>> * Adrian Bunk <bunk@...nel.org> wrote:
> >>>
> >>>       
> >>>> On Mon, Apr 28, 2008 at 06:24:21PM +0200, Ingo Molnar wrote:
> >>>>         
> >>>>> fix build failure found via x86.git randconfig testing:
> >>>>>
> >>>>>  drivers/built-in.o: In function `tda829x_attach':
> >>>>>  : undefined reference to `tda827x_attach'
> >>>>>  drivers/built-in.o: In function `tda829x_attach':
> >>>>>  : undefined reference to `tda18271_attach'
> >>>>>
> >>>>> build failure is due to this nasty dependency:
> >>>>>
> >>>>>   CONFIG_DVB_CORE=m but CONFIG_TUNER_TDA8290=y.
> >>>>>           
> >>>> It might work around the problem in your specific configuration, but 
> >>>> it's not the correct solution.
> >>>>
> >>>> Please send your .config .
> >>>>         
> >>> i dont have it anymore,
> >>>       
> >> That's bad since it makes it harder for other people to reproduce the 
> >> problem.
> >>
> >>     
> >>> but the key was what i wrote in the changelog 
> >>> above:
> >>>
> >>>   CONFIG_DVB_CORE=m
> >>>   CONFIG_TUNER_TDA8290=y
> >>>
> >>> if you look at the symbols above, their definition sites, and the 
> >>> dependencies between them you'll see why that breaks the build. (There 
> >>> might be more to it, this area has been a frequent source of problems.)
> >>>       
> >> TUNER_TDA8290 is the only affected driver, your patch also adds wrong 
> >> dependences to other driver.
> >>
> >> And the underlying problem is that it has both an analog an a DVB tuner, 
> >> and although forcing a dependency on DVB_CORE might make the randconfig 
> >> crowd happy it's not the correct solution.
> >>
> >> Mauro, where were we regarding this issue?
> >>
> >> What about:
> >>
> >> config TUNER_TDA8290
> >>         tristate "TDA 8290/8295 + 8275(a)/18271 tuner combo"
> >>         depends on I2C
> >> 	depends on DVB_CORE || DVB_CORE=n
> >>         select DVB_TDA827X if DVB_CORE
> >>         select DVB_TDA18271 if DVB_CORE
> >>         default m if VIDEO_TUNER_CUSTOMIZE
> >>         help
> >>           Say Y here to include support for Philips TDA8290+8275(a)
> tuner.
> >>
> >> Or is there some twist I'm missing?
> >>     
> >
> >
> > This will fix compilation, but some drivers will be broken, since tda8275
> is
> > needed even for some analog-only drivers.
> >
> > It would be better to do a "select DVB_CORE", although this is also ugly.
> >
> > I'm pinging Mkrufky. He is the one that touched a lot on those drivers.
> Maybe
> > he can come up with a better solution.
> 
> The fix for this issue will come "for free" after the tuner location 
> reorganization to the media/common/ folder.

Yes, but I think we should try do do something for 2.6.25 and 2.6.24. Maybe, we
may just do:
obj-y += /dvb

At media/Kconfig.


Cheers,
Mauro
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