linux-kernel - Re: Possibility of adding -march=native to x86

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Message-ID: <20071025195020.GS30533@stusta.de>
Date:	Thu, 25 Oct 2007 21:50:20 +0200
From:	Adrian Bunk <bunk@...nel.org>
To:	Michael Lothian <mike@...eburn.co.uk>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Possibility of adding -march=native to x86

On Thu, Oct 25, 2007 at 08:32:51PM +0100, Michael Lothian wrote:
> On 25/10/2007, Adrian Bunk <bunk@...nel.org> wrote:
> > On Thu, Oct 25, 2007 at 08:09:56PM +0100, Michael Lothian wrote:
> > > 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?
> >
> > Look at arch/i386/Kconfig.cpu
> >
> 
> Can you be a bit more specific?

Let's make an example:

Consider you want to compile a kernel for your P4.

The MPENTIUM4 option does not only set -march=pentium4, it also enables 
several other options in arch/i386/Kconfig.cpu resulting in better 
performance.

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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