Re: [gentoo-dev] make.conf optimization flags for k6, athlon

[Daniel Robbins]

On Fri, Jul 13, 2001 at 11:35:05PM +0300, Dan Armak wrote:
> Hi all,
>
> In make.conf we specify the optimization CXXFLAGS as follows:
>
> # For Pentium and k6/2 machines
> # -----------------------------
>
> #CHOST="i586-pc-linux-gnu"
> #CFLAGS="-mpentium -march=pentium -O3 -pipe"
> #CXXFLAGS="-mpentium -march=pentium -O3 -pipe"
>
> Why don't we use -march=k6 -mcpu=k6? Wouldn't that allow use of mmx and
> 3dnow, which a generic pentium doesn't have?

-march=k6 will cause the i586 build to *not* run on a Pentium Classic or
MMX, which is why we don't use it.  However, just the -mcpu=k6 should work
on anything.  Yes, we might want to think about using different optimization
settings for our default builds :)  I don't think that an -mathlon option
is available yet; I think that requires the athlon-gcc patches which really
don't seem to be actively developed.

Best Regards,

-- 
Daniel Robbins					<drobbins@g.o>
President/CEO					http://www.gentoo.org 
Gentoo Technologies, Inc.