Date: Thu, 4 Jun 2009 14:35:56 +0200 From: Erik Cederstrand <erik@cederstrand.dk> To: Ed Schouten <ed@80386.nl> Cc: hackers@FreeBSD.org, current@FreeBSD.org Subject: Re: Clang: now available from a SVN server near you! Message-ID: <31BD4D08-6558-46FF-9B93-CF8249AAC461@cederstrand.dk> In-Reply-To: <20090604093831.GE48776@hoeg.nl> References: <20090604093831.GE48776@hoeg.nl>
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--Apple-Mail-338--476216020 Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes Content-Transfer-Encoding: 7bit Den 04/06/2009 kl. 11.38 skrev Ed Schouten: > You can now build your very own version of FreeBSD with Clang > installed > as /usr/bin/cc as follows: Thanks for your hard work, Ed. This is great news! You might want to mention that a few parts are still GCC-compiled due to bugs in Clang ( see http://wiki.freebsd.org/ BuildingFreeBSDWithClang). Also, it's very encouraging that the ports run you did with Erwin (http://lists.cs.uiuc.edu/pipermail/cfe-dev/2009-June/005274.html ) compiles over 7000 ports with Clang. I've asked in the Clang list, but I'd like an opinion from FreeBSD folks, too: Clang supports LTO (http://llvm.org/docs/LinkTimeOptimization.html ), which has a potential for performance improvements. It doesn't work on FreeBSD because the linker we have (in binutils) doesn't know about the libLTO that LLVM provides. There's a new linker from GNU called Gold, but as far as I know it's GPLv3 licensed and therefore undesirable at least to have in base. LLVM provides a linker (http://llvm.org/cmds/llvm-ld.html ) but "it doesn't interact correctly with conventional nm/ar/etc" (http://lists.cs.uiuc.edu/pipermail/cfe-dev/2009-June/005296.html ). There's the ELF toolchain project (elftoolchain.sourceforge.net/) but a BSD-licensed ld hasn't been developed yet. What would be the best way to get LTO to work on FreeBSD? Thanks, Erik --Apple-Mail-338--476216020--
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