Date: Wed, 21 May 2008 10:22:33 +0200 From: Roman Divacky <rdivacky@freebsd.org> To: Ed Schouten <ed@80386.nl> Cc: FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: Re: FreeBSD and LLVM Message-ID: <20080521082233.GA71289@freebsd.org> In-Reply-To: <20080520170639.GE1181@hoeg.nl> References: <20080520170639.GE1181@hoeg.nl>
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On Tue, May 20, 2008 at 07:06:39PM +0200, Ed Schouten wrote: > Hello everyone, > > First of all, for those of you who went to BSDCan, I hope you had a > pleasant flight/trip back home. :-) > > On Saturday I went to the LLVM talk (see http://llvm.org/), which I > really enjoyed. On Friday Remko Lodder and I already talked with him > about the LLVM project. I was excited about the project, so I decided to > give it a try at the office. > > At first I tried LLVM 2.2 with LLVM GCC4 4.2 from Ports, but it didn't > work like expected. I won't go into many details about it. > > When I discussed the problems I was seeing on my system at the office, > someone pointed me to the beta tarballs of the upcoming version 2.3, > which I installed by patching our FreeBSD port. > > http://llvm.org/prereleases/2.3/ > > As an ideal benchmark, I decided to compile an i386 kernel using the > LLVM 2.3 snapshot. I didn't expect it to happen, but it works! I was did you try clang as well? I wonder what it's able to do.... > capable of successfully booting into single user mode and shutting it > down safely. There is one problem however: > > http://llvm.org/bugs/show_bug.cgi?id=2267 > > For some reason, the inline asm support of LLVM is incomplete and causes > compilation errors when generating some of the atomic functions in > i386/include/atomic.h (lines 262 to 265). To work around this, I made > the functions non-atomic. Silly, I know, but it was good enough to > perform some basic tests. > > I think it would be nice if LLVM would once become our standard C > compiler. LLVM currently uses GCC as its frontend, which proves to be > somewhat compatible with the original GCC> yeah... thats a worthy goal :) thnx! roman
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