Date: Wed, 7 Mar 2001 01:57:56 -0800 From: Kris Kennaway <kris@obsecurity.org> To: Jordan Hubbard <jkh@osd.bsdi.com> Cc: kris@obsecurity.org, jkh@FreeBSD.org, cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: -march considered harmful? (Re: cvs commit: src/etc/defaults make.conf) Message-ID: <20010307015756.A36829@mollari.cthul.hu> In-Reply-To: <20010307014941M.jkh@osd.bsdi.com>; from jkh@osd.bsdi.com on Wed, Mar 07, 2001 at 01:49:41AM -0800 References: <20010307005610.A54109@mollari.cthul.hu> <20010307013756K.jkh@osd.bsdi.com> <20010307014607.A34025@mollari.cthul.hu> <20010307014941M.jkh@osd.bsdi.com>
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--yrj/dFKFPuw6o+aM Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Wed, Mar 07, 2001 at 01:49:41AM -0800, Jordan Hubbard wrote: > If you and Mr Hartman can conclusively prove that his problems were > NOT caused by this then I'll discard the other whisperings I've heard > and agree that the reason is not "demonstrable" here. Absence of > evidence is not evidence of absence, however, and I think YOU may be > the one leaping to conclusions here now. I don't see anything better > than vague handwaving about how David would have certainly caught an > optimization error if one had existed in gcc, however, and that's such > a sweeping statement that I'm having a hard time even forming the > mental imagery involved. I'm saying that David, our Compiler Guy, has reviewed all of my CPUTYPE patches and seemed enthusiastic about them, and I was therefore assuming he was happy that none of the options thus activated were known to be significant risks. However I don't want to put words in his mouth so will let David give his real opinion for himself. I still think that putting a warning saying, in effect, "NEVER USE THIS!!" on the basis of one report claimed to be the result of using -march=i686 is a huge dose of FUD and flies in the face of the body of experience suggesting that -march is, in fact, quite safe to use universally. Kris --yrj/dFKFPuw6o+aM Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.4 (FreeBSD) Comment: For info see http://www.gnupg.org iD8DBQE6pgYjWry0BWjoQKURAlT3AKCV9v7ygFuFqoBtxe14IPVpMTMkdwCfRd+Y iXTSYd8iQpCKdRLOjKF7olU= =/YPj -----END PGP SIGNATURE----- --yrj/dFKFPuw6o+aM-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
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