From owner-freebsd-questions@FreeBSD.ORG Tue Apr 21 15:58:18 2009 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id BA82C1065673 for ; Tue, 21 Apr 2009 15:58:18 +0000 (UTC) (envelope-from mel.flynn+fbsd.questions@mailing.thruhere.net) Received: from mailhub.rachie.is-a-geek.net (rachie.is-a-geek.net [66.230.99.27]) by mx1.freebsd.org (Postfix) with ESMTP id 636BB8FC14 for ; Tue, 21 Apr 2009 15:58:18 +0000 (UTC) (envelope-from mel.flynn+fbsd.questions@mailing.thruhere.net) Received: from sarevok.dnr.servegame.org (mailhub.rachie.is-a-geek.net [192.168.2.11]) by mailhub.rachie.is-a-geek.net (Postfix) with ESMTP id 2C9D17E837; Tue, 21 Apr 2009 07:58:17 -0800 (AKDT) From: Mel Flynn To: freebsd-questions@freebsd.org Date: Tue, 21 Apr 2009 17:58:15 +0200 User-Agent: KMail/1.11.2 (FreeBSD/8.0-CURRENT; KDE/4.2.2; i386; ; ) References: <200904202148.42415.naylor.b.david@gmail.com> <200904211032.04835.mel.flynn+fbsd.questions@mailing.thruhere.net> <200904211737.54778.naylor.b.david@gmail.com> In-Reply-To: <200904211737.54778.naylor.b.david@gmail.com> MIME-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-6" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200904211758.15613.mel.flynn+fbsd.questions@mailing.thruhere.net> Cc: David Naylor Subject: Re: Compiling FreeBSD with GCC 4.3+ X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 21 Apr 2009 15:58:19 -0000 On Tuesday 21 April 2009 17:37:50 David Naylor wrote: > 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&nu > > >m= 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. That and comparing apples and pears as default configured fruit, don't usually work well. Of course it appeals to the end user "which fruit is healthier". > > > 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. Policy. Only legal issue in FreeBSD for the end user is WITH_IDEA. > > 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. cat <<'EOF' >> /etc/make.conf .if !empty(.CURDIR:M/usr/ports/*) CC=/usr/local/bin/gcc43 CXX=/usr/local/bin/g++43 .endif EOF Pretty close, huh? > > > 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. Yeah, I don't know how that's gonna work if llvm is ready for base, but no c++. I guess we'll have to sit out g++ 4.2 for a while. If you're in the position to do so, I'd do their benchmarks with ZFS and see how much difference that already makes. -- Mel