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    SubjectRe: ARM defconfig files
    From
    On Thu, Jun 3, 2010 at 11:31 PM, Linus Torvalds
    <torvalds@linux-foundation.org> wrote:
    > On Thu, 3 Jun 2010, Linus Torvalds wrote:
    >>
    >> I apparently haven't explained myself enough, because what you keep on
    >> harping on is not something I consider acceptable.
    >>
    >> STD_CONFIG is pointless. It's pointless because the solution to what
    >> you call STD_CONFIG would be to just NOT USING the special Kconfig.xyz
    >> file at all.
    >
    > To make this _really_ concrete, let me actually give you an example (but
    > broken and pointless) example Kconfig file, in order to _avoid_ having a
    > def_config file.
    >
    > I do it by generating it. Let's say that I want a x86 configuration that
    > has USB enabled. I can basically _ask_ the Kconfig machinery to generate
    > that with something like this:
    >
    >  - create a "Mykconfig" file:
    >
    >        config MYCONFIG
    >                bool
    >                default y
    >                select USB
    >
    >        source arch/x86/Kconfig
    >
    > and then I just do
    >
    >        KBUILD_KCONFIG=Mykconfig make allnoconfig
    >
    > and look what appears in the .config file. In fact, do this:
    >
    >        make allnoconfig
    >        cp .config no-config
    >        KBUILD_KCONFIG=Mykconfig make allnoconfig
    >        cp .config my-config
    >        diff -u no-config my-config
    >
    > to see the point of it all.
    >
    > Now, the above is a _trivial_ one. And it's actually broken, because I
    > should not have forced CONFIG_USB (it depends on CONFIG_USB_SUPPORT).

    And that's precisely the problem that his approach doesn't solve: dependencies.

    ---
    config MYCONFIG
    bool
    default y
    select MACH_OMAP3_BEAGLE

    source arch/arm/Kconfig
    ---

    Is the same as:
    ---
    source arch/arm/Kconfig
    ---

    With the SAT resolver it would be possible to have a .satconfig:
    CONFIG_MACH_OMAP3_BEAGLE=y

    And let the resolver figure everything out back from there.

    --
    Felipe Contreras
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