Date: Sat, 3 Jul 2004 22:16:07 -0700 From: Kris Kennaway <kris@obsecurity.org> To: Dag-Erling Smorgrav <des@FreeBSD.ORG>, src-committers@FreeBSD.ORG, cvs-src@FreeBSD.ORG, cvs-all@FreeBSD.ORG Subject: Re: cvs commit: src/share/examples/etc make.conf Message-ID: <20040704051607.GA78676@xor.obsecurity.org> In-Reply-To: <20040704032139.GA93138@VARK.homeunix.com> References: <200407030941.i639fwt8078389@repoman.freebsd.org> <20040704032139.GA93138@VARK.homeunix.com>
next in thread | previous in thread | raw e-mail | index | archive | help
--bp/iNruPH9dso1Pn Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sat, Jul 03, 2004 at 08:21:39PM -0700, David Schultz wrote: > On Sat, Jul 03, 2004, Dag-Erling Smorgrav wrote: > > des 2004-07-03 09:41:58 UTC > >=20 > > FreeBSD src repository > >=20 > > Modified files: > > share/examples/etc make.conf=20 > > Log: > > The -O2 bugs are in libalias(3), not ppp(8). >=20 > 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. >=20 > 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. Kris --bp/iNruPH9dso1Pn Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (FreeBSD) iD8DBQFA55KXWry0BWjoQKURAnozAKCd0+rQVwfbcc0V0utyc4Vu173+ZQCfXYcX l/fOIIjajc7zm3oq5ZfPyfk= =Ev6T -----END PGP SIGNATURE----- --bp/iNruPH9dso1Pn--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20040704051607.GA78676>