From owner-cvs-src@FreeBSD.ORG Mon Jul 5 19:48:34 2004 Return-Path: Delivered-To: cvs-src@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 819A716A4CE; Mon, 5 Jul 2004 19:48:34 +0000 (GMT) Received: from TRANG.nuxi.com (trang.nuxi.com [66.93.134.19]) by mx1.FreeBSD.org (Postfix) with ESMTP id 3A1E343D31; Mon, 5 Jul 2004 19:48:34 +0000 (GMT) (envelope-from obrien@NUXI.com) Received: from dragon.nuxi.com (obrien@localhost [127.0.0.1]) by TRANG.nuxi.com (8.12.11/8.12.11) with ESMTP id i65JmV3Z089691; Mon, 5 Jul 2004 12:48:31 -0700 (PDT) (envelope-from obrien@dragon.nuxi.com) Received: (from obrien@localhost) by dragon.nuxi.com (8.12.11/8.12.11/Submit) id i65JmUBS089690; Mon, 5 Jul 2004 12:48:30 -0700 (PDT) (envelope-from obrien) Date: Mon, 5 Jul 2004 12:48:29 -0700 From: "David O'Brien" To: Kris Kennaway Message-ID: <20040705194829.GA3743@dragon.nuxi.com> References: <200407030941.i639fwt8078389@repoman.freebsd.org> <20040704032139.GA93138@VARK.homeunix.com> <20040704051607.GA78676@xor.obsecurity.org> <20040704205648.GA1617@dragon.nuxi.com> <20040704232050.GA90994@xor.obsecurity.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20040704232050.GA90994@xor.obsecurity.org> User-Agent: Mutt/1.4.1i X-Operating-System: FreeBSD 5.2-CURRENT Organization: The NUXI BSD Group X-Pgp-Rsa-Fingerprint: B7 4D 3E E9 11 39 5F A3 90 76 5D 69 58 D9 98 7A X-Pgp-Rsa-Keyid: 1024/34F9F9D5 cc: cvs-src@FreeBSD.ORG cc: src-committers@FreeBSD.ORG cc: cvs-all@FreeBSD.ORG cc: Dag-Erling Smorgrav Subject: Re: cvs commit: src/share/examples/etc make.conf X-BeenThere: cvs-src@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list Reply-To: obrien@FreeBSD.ORG List-Id: CVS commit messages for the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 05 Jul 2004 19:48:34 -0000 On Sun, Jul 04, 2004 at 04:20:50PM -0700, Kris Kennaway wrote: > On Sun, Jul 04, 2004 at 01:56:48PM -0700, David O'Brien wrote: > > On Sat, Jul 03, 2004 at 10:16:07PM -0700, Kris Kennaway wrote: > > > On Sat, Jul 03, 2004 at 08:21:39PM -0700, David Schultz wrote: > > > > FWIW, I've been compiling most things with -O2 for a while (to > > > > find -O2 bugs, not for speed) and haven't noticed many problems. > > > > The only significant one I know of is that -O2 breaks > > > > floating-point exceptions in libm because gcc doesn't support the > > > > FENV_ACCESS pragma. I think for some routines like rint(3), it > > > > may even give the wrong answer due to incorrect optimizations, but > > > > I'd have to check that again. > > > > > > > > AFAIK, the necessary functionality to make gcc's optimizer treat > > > > floating-point code in a sane manner isn't on the horizon, so > > > > maybe -O2 should be automatically turned off while compiling libm > > > > (and perhaps libalias as well). That would make it more > > > > easily justifiable to make -O2 the default at some future point. > > > > > > I don't think we can ever make it the default since there's likely to > > > be a lot of software in ports that would be broken too. > > > > 99% of the ports that "may break" build with -O2 on Linux (as -O2 is > > their default). What is different about us vs. Linux for these ports? > > We care about not introducing instability into our packages? > > If we have >=2 -O2 bugs in our source tree alone, why should you think > that none of the 11000 ports are affected? Because most everything in the ports collection was developed on Linux using -O2. The bugs are in our code, not gcc's -O2. -- -- David (obrien@FreeBSD.org)