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Date: Mon, 10 Oct 2005 13:43:59 -0400
From: Kris Kennaway <kris@obsecurity.org>
To: Claus Guttesen <kometen@gmail.com>
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Cc: freebsd-amd64@freebsd.org, Kris Kennaway <kris@obsecurity.org>
Subject: Re: /etc/make.conf flags for Intel
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On Mon, Oct 10, 2005 at 09:46:49AM +0200, Claus Guttesen wrote:
> > > > Hey, how should I tune my /etc/make.conf file for my Intel Xeon (EM=
64) Box?
> > > > Running 6.0 B5
> > >
> > > march=3Dnocona
> > You misspelled 'CPUTYPE'
>=20
> My bad.
>=20
> > > Change CFLAGS line from -O to -O2.
> >
> > It *is* the default.
>=20
> /usr/share/examples/etc/make.conf is set to -O.

The setting in <sys.mk> trumps this documentation file, but you're
right, this should be updated there.  Could you please send a PR?

> Copy /usr/share/examples/etc/make.conf to /etc if make.conf is
> missing/empty and make the changes below.
>=20
> CPUTYPE=3Dnocona
> CFLAGS=3D -O2 -pipe
> COPTFLAGS=3D -O2 -pipe

COPTFLAGS=3D-O2 is a bad idea if your kernel panics and you need
assistance, because it often munges the debugging backtraces to the
point of uselessness.

Kris

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