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SubjectRe: [build bug, 2.6.24-rc1] CONFIG_VIDEO_DEV=m & CONFIG_VIDEO_SAA7146_VV=y
On Sat, 27 Oct 2007 23:30:57 +0200 Johannes Stezenbach wrote:

> On Fri, Oct 26, 2007, Ingo Molnar wrote:
> >
> > the attached config (generated via make randconfig) fails to build due
> > to the combination of these config entries:
> >
> > CONFIG_VIDEO_DEV=m
> > CONFIG_VIDEO_SAA7146_VV=y
> >
> > i found no obvious Kconfig way to force VIDEO_SAA7146_VV to be modular
> > when VIDEO_DEV is modular - is there a good solution for this?
>
> According to http://lkml.org/lkml/2007/10/21/226 :
>
> config VIDEO_SAA7146_VV
> tristate
> depends on VIDEO_DEV = y || VIDEO_DEV = VIDEO_SAA7146_VV
> select VIDEOBUF_DMA_SG
> select VIDEO_SAA7146
>
> (untested)

Nope, won't work. I tried that last night. VIDEO_DEV_SAA7146_VV
has too many "select"s involved, but select doesn't follow the dependency
chains. IOW, as written in Documentation/kbuild/kconfig-language.txt:

select is evil.... select will by brute force set a symbol
equal to 'y' without visiting the dependencies. So abusing
select you are able to select a symbol FOO even if FOO depends
on BAR that is not set.

---
~Randy
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