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    SubjectRe: CONFIG_TINY
    On Thu, Oct 31, 2002 at 07:33:01AM -0700, Tom Rini wrote:
    > > If gcc regularly generates larger code with -Os the answer is to talk to
    > > the gcc people, not to avoid using -Os...
    > It's not that it does regularly, it's that it can, and if it does, it's
    > not really a gcc bug from what I recall. So I don't think CONFIG_TINY
    > should prefer -Os over -O2 but instead we should just ask the user what
    > level of optimization they want. Remember, one of the real important
    > parts of embedded systems is flexibility.

    Not to stretch this point too long, but turning off inlined functions 'can'
    make code bigger too. It usually doesn't.

    I have no problem with the other suggestion that CONFIG_TINY specify a
    template for a set of build options, but if CONFIG_TINY is used (either
    as an option, or a template of options) -Os should always be preferred
    over -O2. Whether the user can still override this or not is a different
    issue from whether -Os should be preferred over -O2 when CONFIG_TINY is
    specified.

    Or specified more clearly: If the compiler optimization flag is configurable,
    choosing CONFIG_TINY should default the optimization flag to -Os before it
    defaults the optimization flag to -O2.

    mark

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