From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 30668 invoked by uid 1002); 1 Mar 2003 21:34:30 -0000 Mailing-List: contact gentoo-dev-help@gentoo.org; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-dev@gentoo.org Received: (qmail 1657 invoked from network); 1 Mar 2003 21:34:30 -0000 From: Jeff Kowing MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <15969.9362.40481.829880@igor.jsc.nasa.gov> Date: Sat, 1 Mar 2003 15:22:26 -0600 To: robert.cole@support4linux.com Cc: gentoo-dev@gentoo.org In-Reply-To: <200303010734.09181.robert.cole@support4linux.com> References: <200303010734.09181.robert.cole@support4linux.com> X-Mailer: VM 7.07 under Emacs 21.2.1 Reply-To: jeffrey.d.kowing@nasa.gov Subject: [gentoo-dev] -pentium4 vs -pentium3 X-Archives-Salt: 2edbf4a3-91a1-4a51-965b-b02d0a623388 X-Archives-Hash: 02a771897ac3832d3de38c5407ae3bfe Robert Cole writes: > I recently noted a warning in the new make.conf file to not use the -pentium4 > compiler option and to use -pentium3 instead. My entire system was built from > stage1 with -pentium4 and I'm not having any issues. > > To be safe I switched it to p3 for now. > > Anymore detail on this? Is this something that has to be fixed in gentoo > specifically or all source in general? Robert, I was bit by at least one of the problems a while back. It seems that some of the floating point code is not quite right yet for pentium4. I believe this is a gcc and maybe glibc issue. The particular example that caused me problems is the glibc modf() function. See http://forums.gentoo.org/viewtopic.php?t=27211&highlight=python+float for more info and a sample c program that will highlight the problem. It was suggested at the time by Nick Jones (see http://article.gmane.org/gmane.linux.gentoo.user/23056) that I back down to pentium2. I haven't updated my portage recently, so I haven't looked at what the new updated make.conf file suggests but I definitely would follow any advice it gives. -- Jeff Kowing jeffrey.d.kowing@nasa.gov -- gentoo-dev@gentoo.org mailing list