Re: problem with RH7.3 Pg7.3.4 binaries - Mailing list pgsql-hackers

Will check later today.

Extract from man gcc:
      -mcpu=cpu-type          Tune to cpu-type everything applicable about the generated code,          except for the
ABIand the set of available instructions.  The          choices for cpu-type are i386, i486, i586, i686, pentium,
 
pentium-          mmx, pentiumpro, pentium2, pentium3, pentium4, k6, k6-2, k6-3,          athlon, athlon-tbird,
athlon-4,athlon-xp and athlon-mp.
 
          While picking a specific cpu-type will schedule things appropri-          ately for that particular chip, the
compilerwill not generate
 
any          code that does not run on the i386 without the -march=cpu-type          option being used.  i586 is
equivalentto pentium and i686 is          equivalent to pentiumpro.  k6 and athlon are the AMD chips as
opposedto the Intel ones.
 


cheers

andrew

----- Original Message ----- 
From: "Mark Cave-Ayland" <m.cave-ayland@webbased.co.uk>
To: <mag@fbab.net>
Cc: "'Joe Conway'" <mail@joeconway.com>; "'Andrew Dunstan'"
<andrew@dunslane.net>; "'Lamar Owen'" <lowen@pari.edu>; "'Postgresql
Hackers'" <pgsql-hackers@postgresql.org>
Sent: Tuesday, August 05, 2003 6:28 AM
Subject: Re: [HACKERS] problem with RH7.3 Pg7.3.4 binaries


> Hi Magnus,
>
> Thanks for that. I always believed that the mcpu flag could enable a C
> compiler to generate code that could use the extra instructions on the
> newer CPUs - perhaps one day I'll get around to reading the
> documentation ;)
>
> Anyway, I've posted the compiled RH 7.3 postgresql-7.3.4 RPMs at
> http://www.webbased.co.uk/mca/pgsql/. Andrew, if you are satisfied that
> these work correctly on your RH7.3 install, there is no problem with
> Lamar placing copies of them on the postgresql website for people to
> download.
>
>
> Cheers,
>
> Mark.
>
> ---
>
> Mark Cave-Ayland
> Webbased Ltd.
> Tamar Science Park
> Derriford
> Plymouth
> PL6 8BX
> England
>
> Tel: +44 (0)1752 764445
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>
>
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>
> > -----Original Message-----
> > From: Magnus Naeslund(w) [mailto:mag@fbab.net]
> > Sent: 05 August 2003 10:59
> > To: Mark Cave-Ayland
> > Cc: 'Joe Conway'; 'Andrew Dunstan'; 'Lamar Owen'; 'Postgresql Hackers'
> > Subject: Re: [HACKERS] problem with RH7.3 Pg7.3.4 binaries
> >
> >
> >
> > Mark Cave-Ayland said:
> > > Hi there,
> > >
> > > I have a RedHat 7.3 machine that can build the 7.3.4 RPMs
> > if required
> > > - it only contains RPMs from the vanilla CD or from
> > > updates.redhat.com. I've just done a test build and
> > everything seems
> > > OK except that the C compiler is passed the -mcpu=i686 flag - I'm
> > > guessing I need to somehow change this to i386 so it will binaries
> > > will run on actual i386 machines? Can someone point me in the right
> > > direction?
> > >
> >
> > The -mcpu flag doesn't do what you seems to think it does.
> > It still generates i386 compatible code, but favours i686
> > processor timings etc.
> >
> > >
> > > Cheers,
> > >
> > > Mark.
> >
> >
> > Magnus
> >
>
>
>
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