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SubjectRe: Possibility of adding -march=native to x86
Actually I changed the Makefile.cpu and changed the -march to native
which did slightly change the size of the kernel (slightly larger I
think)

So what else does that option change?

Mike

On 25/10/2007, Adrian Bunk <bunk@kernel.org> wrote:
> On Thu, Oct 25, 2007 at 07:33:35PM +0100, Michael Lothian wrote:
> > Hi
> >
> > I was wondering if it was possible to add -march=native support to the
> > processor options of the new x86 architecture if gcc 4.2 or greater is being
> > used.
> >
> > I'm not suggesting this should be a default at all, merely an extra option
> > similar to selecting P4, Athlon or even -Os.
> >
> > I've manually tried this flag at home with no ill effects.
>
> Selecting your CPU in the kernel configuration has more effects than
> just setting the gcc flag, so it wouldn't gain you anything since you
> anyway have to choose the correct CPU.
>
> > Mike
>
> cu
> Adrian
>
> --
>
> "Is there not promise of rain?" Ling Tan asked suddenly out
> of the darkness. There had been need of rain for many days.
> "Only a promise," Lao Er said.
> Pearl S. Buck - Dragon Seed
>
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