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    SubjectRe: [PATCH] check_gcc for i386


    On Sat, 30 Aug 2003, Jeff Garzik wrote:

    > Alan Cox wrote:
    > > On Sad, 2003-08-30 at 23:58, Marcelo Tosatti wrote:
    > >
    > >>> ifdef CONFIG_MPENTIUM4
    > >>>-CFLAGS += -march=i686
    > >>>+CFLAGS += $(call check_gcc,-march=pentium4,-march=i686)
    > >>> endif
    > >>>
    > >>> ifdef CONFIG_MK6
    > >>
    > >>OK, I forgot what that does. Can you please explain in detail what
    > >>check_gcc does.
    > >
    > >
    > > Tries to use gcc with the options given and if not falls back to the
    > > second set suggested. So it'll try -march=pentium4 (new gcc) and
    > > fall back to -march=i686
    >
    >
    > Yep. I introduced check_gcc into 2.4 (backported from 2.5), in fact.
    >
    > The above change does exactly what Alan describes, and is a patch I was
    > planning to submit myself :) I did not want to change compiler options
    > at the time when I submitted the check_gcc patch, but after many months
    > of manually patching to get the best compiler flags, it seems solid.

    I'm just worried about having nicey gcc surprises. Alan thinks its ok, and
    you too so I guess I'll just apply it tomorrow and see what happens



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