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    SubjectRe: [kbuild-devel] Re: Announce: Kernel Build for 2.5, Release 2.0 is available

    Keith Owens wrote:

    >It takes time to do all the analysis to work out what has changed and
    >what has been affected. You might know that you only changed one file
    >but kernel build and make don't know that until they have checked
    >everything. Changing one file or specifying a command override might
    >affect one file or it might affect the entire kernel.
    >If you know that you have only changed one source file and you have not
    >altered the Makefiles or the dependency chain in any way, then it
    >_might_ be safe to just rebuild that one file, use NO_MAKEFILE_GEN=1.
    >Otherwise let kbuild work out what has been affected.
    Humans/Hackers are really really REALLY good at making assumptions and
    using assumptions that are outdated, thus leading to mistakes.
    Some/many hackers like to live in there own little world and not worry
    about the effect they might have on other developers. Using a
    dependency maintenance tool (such as Make, Cook, ...) to automate the
    build is the _ONLY_ safe way to be sure the build is correct. This
    assumes that the build system itself is 100% correct :)

    Brendan Simon.

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