Date: Sat, 24 Jan 2009 19:07:57 +0000 From: Saifi Khan <saifikhan@gmail.com> To: Pojken Purken <pp@pp.dyndns.biz> Cc: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: default CFLAGS Message-ID: <9a52b1190901241107h5bff8c1al6c980b7ad8e99051@mail.gmail.com> In-Reply-To: <497B5686.8050600@pp.dyndns.biz> References: <Pine.LNX.4.64.0901241734020.6296@localhost> <20090124124535.3006687c@gumby.homeunix.com> <9a52b1190901240451i14dc544fm1c241d6f43fa897b@mail.gmail.com> <20090124131629.1f9fabe4@gumby.homeunix.com> <497B2536.7030907@pp.dyndns.biz> <20090124174357.4aafcf1a@gumby.homeunix.com> <497B5686.8050600@pp.dyndns.biz>
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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 proc= essor with the CPU information shown in dmesg ? --=20 thanks Saifi.
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