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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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