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    SubjectRe: Kconfig and toolchain dependencies
    On Fri, Feb 03, 2012 at 01:29:09PM -0800, H. Peter Anvin wrote:
    > It seems relatively straightforward to do if we were to manifest some
    > CONFIG_ variables based on the target toolchain, e.g.
    >
    > CONFIG_GCC=0x040601
    >
    > ... and perhaps do other tests. I suspect we would run the tests less
    > frequently than what we do right now with the tests embedded in the
    > Makefile.
    >
    > Does anyone have a feel for if this would be a good addition, and if so
    > where it best fits into the chain?

    This seems like a *great* idea. Unfortunately, a quick look at the
    implementation of kbuild suggests that it doesn't currently implement
    numeric comparisons (<, <=, >, >=), only equality (= and !=). Most of
    the time, a Kconfig file will want to write "depends GCC >=
    some_version".

    Looking at scripts/kconfig/expr.c, it doesn't look that hard to add,
    though.

    - Josh Triplett


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