Date: Fri, 15 Apr 2011 16:31:27 +0200 From: Damjan Marion <damjan.marion@gmail.com> To: Vassilis Laganakos <vassilis.laganakos@yahoo.com> Cc: "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: Re: LLVM/Clang cross-compiling for ARM Message-ID: <DF84E1FC-F047-4DF7-B369-12B7675A7127@gmail.com> In-Reply-To: <475540.33003.qm@web112105.mail.gq1.yahoo.com> References: <475540.33003.qm@web112105.mail.gq1.yahoo.com>
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Hi Vassilis, On Apr 14, 2011, at 1:06 PM, Vassilis Laganakos wrote: > Hi Damjan, Mark, >=20 > ----- Original Message ----- >=20 >> From:Damjan Marion <damjan.marion@gmail.com> >> To:Mark Tinguely <marktinguely@gmail.com> >> Cc:Vassilis Laganakos <vassilis.laganakos@yahoo.com>; = "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> >> Sent:Thursday, April 14, 2011 8:13 AM >> Subject:Re: LLVM/Clang cross-compiling for ARM >>=20 >>=20 >> Hi Mark, >>=20 >> Seems that clang from current (made by i386 buildworld) is able to = build ARM=20 >> code: >>=20 >> # clang -v = =20 >> = =20 >> FreeBSD clang version 2.9 (trunk 126547) 20110226 >> Target: i386-undermydesk-freebsd9.0 >> Thread model: posix >>=20 > That's the same I get when I build llvm/clang as a cross-compiler, and = I thought that > something was wrong. I'd expect that to be: "arm-unknown-freebsd9.0", = but it > seems from your test bellow that it does generate ARM code. Seems that this just shows host architecture. >=20 >> <snip> >=20 > Well you proved the opposite from what we assumed, since this looks = like ARM assembly to me :) >=20 > Anyone knows if something has changed in = http://wiki.freebsd.org/BuildingFreeBSDWithClang > since it was last edited? My understanding is that clang/LLVM architecture is build from day one = to support cross compilation so same clang executable can build code for = multiple targets. You can see the list of supported architectures with = "llc --version" For specific architecture you can see list of all variants and features = with "llvm-as < /dev/null | llc -march=3Darm -mcpu=3Dhelp" Unfortunately llc and llvm-as are not built as part of buildworld. = According to folks from freebsd-clang IRC channel llc and llvm-as are = not built because there is no use of them. >=20 >=20 > Damjan, if you find some more info about this with llvm/clang, could = you please post > the links here? :) I dont have any special reference, but looking into source code might = help :) BTW According to #freebsd-clang folks cross-compilation might work just = by renaming or symlinking clang to arm-freebsd-clang triple (or = similar). They are also looking for feedback. Regards, Damjan
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