Date: Thu, 5 May 2011 16:10:04 +0200 From: Olivier Smedts <olivier@gid0.org> To: Roman Divacky <rdivacky@freebsd.org> Cc: current@freebsd.org Subject: Re: Clang error make buildworld Message-ID: <BANLkTin0n9q%2BMjaFqLRZ9F8NwEjQJYuL%2Bw@mail.gmail.com> In-Reply-To: <20110505135458.GA79622@freebsd.org> References: <201105040107.p4417NTR048534@pozo.com> <4DC0F46C.3020806@FreeBSD.org> <201105041344.p44DiOId032272@pozo.com> <4DC160B9.5060004@FreeBSD.org> <4DC2A0E5.5040602@zedat.fu-berlin.de> <BANLkTimiU42U0m5nCo=hSdaUF50rwnOk4w@mail.gmail.com> <20110505135458.GA79622@freebsd.org>
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2011/5/5 Roman Divacky <rdivacky@freebsd.org>: >> Because with clang, -march=native often breaks buildworld, while >> -march=core2 is ok. > > Can you be more specific about this claim? On what CPU are seeing > this breakage? On a Core2 Quad Q9450 and a Core i7 860. I use "core2" on both because that's the most approaching values supported in bsd.cpu.mk and gcc in HEAD. I reverted from "-march=native" to "-march=core2" for two reasons, the first beeing that gcc didn't use the right "-mtune" when using "-march=native" (I think it was using internally "-mtune=generic"). I'll try to be more specific if I can find the tests I was using at that time. The second reason is that with "-march=native", my buildworld often failed with clang, and since I use "-march=core2" I had no issues. I'll try to buildworld with "-march=native" and report back. > Anyway, can you compile and run on that machine this: > > http://lev.vlakno.cz/~rdivacky/Host.cpp Compiled with gcc and clang, both output (on one of the two computers I use most) : roman = corei7 > It's the LLVM CPU autodetection code, it will print the name of > your CPU. I wonder whats the difference to "core2". > > Thank you. roman Cheers -- Olivier Smedts _ ASCII ribbon campaign ( ) e-mail: olivier@gid0.org - against HTML email & vCards X www: http://www.gid0.org - against proprietary attachments / \ "Il y a seulement 10 sortes de gens dans le monde : ceux qui comprennent le binaire, et ceux qui ne le comprennent pas."
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