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Date:      Sat, 24 Jan 2009 21:07:18 -0200
From:      Gonzalo Nemmi <gnemmi@gmail.com>
To:        freebsd-questions@freebsd.org
Subject:   Re: default CFLAGS
Message-ID:  <200901242107.18233.gnemmi@gmail.com>
In-Reply-To: <9a52b1190901241107h5bff8c1al6c980b7ad8e99051@mail.gmail.com>
References:  <Pine.LNX.4.64.0901241734020.6296@localhost> <497B5686.8050600@pp.dyndns.biz> <9a52b1190901241107h5bff8c1al6c980b7ad8e99051@mail.gmail.com>

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On Saturday 24 January 2009 5:07:57 pm Saifi Khan wrote:
> On Sat, Jan 24, 2009 at 5:57 PM, Pojken Purken <pp@pp.dyndns.biz> wrote:
> > RW wrote:
> >> On Sat, 24 Jan 2009 15:27:02 +0100
> >>
> >> Morgan Wesstr=F6m <freebsd-questions@pp.dyndns.biz> wrote:
> >>> The section "options enabled" will list them all. I usually only add
> >>> "-march=3Dnative" to my CFLAGS to enable a few more CPU specific
> >>> optimizations.
> >>
> >> If you set CPUTYPE, -march is set to match, so setting -march=3Dnative
> >> should be redundant. OTOH a number of other make variables are defined
> >> from CPUTYPE, so if you set  -march=3Dnative, but not CPUTYPE you might
> >> miss some optimisations based on build options.
> >>
> >> I've no idea whether there are any such options, just that you're
> >> probably not going to do better than setting CPUTYPE, and leaving the
> >> rest alone.
> >
> > I'm sorry I was unclear. I set CPUTYPE to native of course which is then
> > passed as -march=3Dnative to compiler.
>
> The entry in file /var/run/dmesg.boot shows the CPU information as
> CPU: Intel (R) Celeron (R) CPU 2.40 GHz (686-class CPU)
>
> The entry in /usr/share/examples/etc/make.conf shows CPU types for Intel =
as
> core2 core nocona pentium4m pentium4 prescott pentium3m pentium3 pentium-m
> pentium2 pentiumpro pentium-mx pentium i486 i386
>
> What would be the appropriate CPUTYPE specification in this case ?
>
> Is there any table which sort of maps the marketing names of the Intel
> processor with the CPU information shown in dmesg ?

This might help you out a little.
http://forums.freebsd.org/showthread.php?t=3D816

Hope you found it usefull

Regards

=2D-=20
Blessings
Gonzalo Nemmi



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