linux-kernel - Re: [patch, -git] media/video/sound build fix, TEA5761/TEA5767

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Date:	Wed, 30 Apr 2008 14:09:50 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	David Miller <davem@...emloft.net>, mingo@...e.hu,
	mchehab@...radead.org, akpm@...ux-foundation.org,
	linux-dvb-maintainer@...uxtv.org, video4linux-list@...hat.com,
	linux-kernel@...r.kernel.org, efault@....de
Subject: Re: [patch, -git] media/video/sound build fix, TEA5761/TEA5767

At Wed, 30 Apr 2008 13:29:59 +0200,
Sam Ravnborg wrote:
> 
> On Wed, Apr 30, 2008 at 04:17:03AM -0700, David Miller wrote:
> > From: Takashi Iwai <tiwai@...e.de>
> > Date: Wed, 30 Apr 2008 13:11:31 +0200
> > 
> > > IMO, it's the reverse selection from sound to V4L that makes things
> > > complicated.  I believe it's better to fix it as a normal dependency.
> > > 
> > > How about the patch below?
> > 
> > The question that remains is what does this mean for users?
> > 
> > How does a user, who wants to enable this 'sound' driver,
> > learn that they must enable the v4l subsystem in order to
> > do so?
> 
> [OT to the actual problem]
> 
> I have envisioned something like a "requires tag" that
> would list what a config symbols needs.
> 
> Like in this case it would have been:
> 
> 	requires V4L
> 
> This should in the frontends then if the user selects a symbol
> where the 'requires' are not satisfied with a window listing
> the menuentries for the symbol that the user needs to
> enable to satisfy what the original symbol requires.
> 
> This is the only way to do this in a way so the
> user is actually aware that enabling a webcam also enables USB.
> Or at least this is my best suggestion.

This looks promising.

> But sorry - I have not implemented it.
> And it is likely more complicated than I foresee.

Yeah, in some cases, you can't easily turn on the item depends on
a complex dependency.  Distros have similar problems regarding package
maintenance system.


Takashi
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