Re: [gentoo-user] CFLAGS Core2Duo

[Jakob <jak.gentoo@googlemail.com>]

On 12/19/06, Boyd Stephen Smith Jr. <bss03@volumehost.net> wrote:
> On Tuesday 19 December 2006 13:48, Jakob <jak.gentoo@googlemail.com> wrote
> about 'Re: [gentoo-user] CFLAGS Core2Duo':
> > Thaks for the quick reply.
> > On http://gentoo-wiki.com/Safe_Cflags they say for 32bit use:
> > CFLAGS="-march=prescott -O2 -pipe -fomit-frame-pointer"
> > Is this wat you meant for better -march settings?
>
> Specifically, I meant that -march=prescott is probably better
> than -march=pentium-m.  If you use Konqueror, hit <URL: info:/gcc/i386 and
> x86-64 Options >; or just use your favorite infotext reader to look at the
> x86(_64) machine specific options, so you are generating code tuned
> particularly to your processor.
>
> > I was confused by the GWN because they didnt say its for 64bit only.
>
> Well, a lot of people assume that buying a 64-bit processor means you
> actually want to use the extra bits (and registers).  Of course, it's
> getting harder and harder to buy a non-64 bit chip.
>
> --
> "If there's one thing we've established over the years,
> it's that the vast majority of our users don't have the slightest
> clue what's best for them in terms of package stability."
> -- Gentoo Developer Ciaran McCreesh
>
>
>
Its funny till yesterday I didnt even know It supports 64bit ;-)
I think I will change to -march=prescott and stick with 32bit.
do I have to run emerge -avuD world after changing to -march=prescott?
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