Date: Tue, 21 Apr 2009 17:37:50 +0200 From: David Naylor <naylor.b.david@gmail.com> To: Mel Flynn <mel.flynn+fbsd.questions@mailing.thruhere.net> Cc: freebsd-questions@freebsd.org Subject: Re: Compiling FreeBSD with GCC 4.3+ Message-ID: <200904211737.54778.naylor.b.david@gmail.com> In-Reply-To: <200904211032.04835.mel.flynn%2Bfbsd.questions@mailing.thruhere.net> References: <200904202148.42415.naylor.b.david@gmail.com> <200904211032.04835.mel.flynn%2Bfbsd.questions@mailing.thruhere.net>
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[-- Attachment #1 --] On Tuesday 21 April 2009 10:32:04 Mel Flynn wrote: > Hi David, > > On Monday 20 April 2009 21:48:39 David Naylor wrote: > > There has been an article recently published by phoronix > > (http://www.phoronix.com/scan.php?page=article&item=pcbsd_vs_kubuntu&num= > >1) that compares PC-BSD to Kubuntu. Kubuntu uses GCC 4.3.3 compared to > > FreeBSD's GCC 4.2.2. There is a considerable performance difference > > between the two OS's, the article contributes this difference to the > > compiler. > > Nice shot in the dark, since except the calculations a lot of these are > influenced by "journaled FS vs stock UFS". I know, benchmarking anything but the simplest things are influenced by too many factors. Pity it doesn't provide an unbiased comparison of FreeBSD and Linux. > > In order to check if this is so (and to get the speed improvements of GCC > > 4.3+) one needs to compile the ports (and preferable world/kernel as > > well) with GCC 4.3+. > > It's license is incompatible with world/kernel. What type of incompatibility. I know FreeBSD has reservations about GPLv3 (I personally don't understand why everyone cannot be friends and use BSD Licenses). So is this a policy incompatibility or a legal one (i.e. would it be 'illegal' for me to use GCC 4.3+ to compile world/kernel, as an end-user/consumer of FreeBSD). I assume the same discussion applies to binutils. > That said, install > lang/gcc43 and set CC/CXX for ports. World/kernel would be a lot harder. > Maybe setting WITHOUT_GCC in /etc/src.conf and setting CC/CXX would work, > but there's quite a few modifications to gcc that aren't in ports lang/gcc, > so I have my doubts. I suppose it would be nice if there was an easy way to use an out-of-source compiler in FreeBSD. Like set PORTS_COMPILER=gcc43 and the port will installed and used... One may have dreams. > > Is there an easy way to set this up and does anyone know the > > compatibility of world/kernel/ports with GCC 4.3+? > > > > Also has anyone tried this and benchmarked the result? > > Not me, but be sure to stick around for the new non-gcc compiler coming to > a FreeBSD near you. And with the work done by Marcel Molenaar on gpart, > hopefully we can have ZFS and gjournal as choices in the installer. You mean llvm, waiting patiently. I suppose my suggestion above will become even more important (at least for compiling ports) since it will be a while till llvm has decent c++ support. Thanks for your reply [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.9 (FreeBSD) iEYEABECAAYFAknt6FIACgkQUaaFgP9pFrKqQACgg6zU7qmbx1cTXZDw3iuSWAkW a2EAn2J6sIf3SGT+NN7Q9kw65Fwnj614 =WyV+ -----END PGP SIGNATURE-----
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