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    SubjectRe: [PATCH v3.1] kbuild: implement several W= levels
    On Wed, 27 Apr 2011 13:35:13 +0200, Borislav Petkov said:

    > If we do this inclusive, then W=2 dumps the, let's call it, level 1
    > _plus_ the new level 2 warnings, polluting the output with something
    > I've already seen, but only partially. And then I start to think, did
    > I see this one already, didn't I, which was it? By the time you enable
    > W=3, the output becomes pretty useless. For example, W=3 generates 190+
    > MB logfile here only with level 3 warnings. Now imagine all 3 levels
    > combined.

    If each level is averaging 10x the previous level, then all 3 levels will only be 11%
    bigger, or 211MB.

    You *really* want to get *all* the warnings - quite often, you'll be looking
    at a set of 15 or 20 level-3 warnings. And if you had the Level-2's in there as
    well, you'd immediately realize that the single level-2 was the real root-cause
    of all the cascating warnings.

    Also, having it as a "volume control" means I don't have to go reading the
    Makefile to figure out which number I need to specify for which message - I can
    just say W=3 and *know* the flavor I want will be in there somewhere. Let's
    face it, if there's over 10 or 15 warnings involved, grep or your editor's
    "locate next" will do a better job of finding it than you ever can...

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