Re: [gentoo-user] Questions about CPU settings in kernel and USE

[David W Noon]

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On Tue, 15 Apr 2014 14:33:47 -0400, Walter Dnes
<mailto:dwnoon@××××××××.com> (waltdnes@××××××××.org) wrote about "Re:
[gentoo-user] Questions about CPU settings in kernel and USE" (in
<20140415183347.GA16109@××××××××.org>):

> On Tue, Apr 15, 2014 at 03:42:31PM +0100, David W Noon wrote
>
>> If you specify -march=k8 in your CFLAGS, you should get pretty
>> decent object code from GCC.
>
> I've used "-march=native" since it became available, because it's
> one less thing to worry about.  That's why I didn't ask about
> CFLAGS.
>
> "echo | gcc -### -E - -march=native" spits out a whole bunch of
> diagnostic output.  In my case, it includes "-march=amdfam10", so
> "-march=native" looks better.

That's fine.  The only thing is that many people use distcc to compile
packages for a laptop on a desktop or server, and -march=native
usually has different semantics on the server than on the laptop; thus
it is better in such a situation to specify the hardware architecture
explicitly.

If you're not using distcc, no problems should arise.

You should also check your CHOST setting to ensure you have
x86_64-pc-linux-gnu specified.
- -- 
Regards, Dave  [RLU #314465]
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dwnoon@××××××××.com
(David W Noon)
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