Date: Wed, 20 May 2015 04:52:34 +0000 From: Brooks Davis <brooks@freebsd.org> To: sbruno@freebsd.org Cc: Brooks Davis <brooks@freebsd.org>, dim@freebsd.org, "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org> Subject: Re: Trying to use clang/head and XCC Message-ID: <20150520045234.GA83978@spindle.one-eyed-alien.net> In-Reply-To: <555BE7A1.3040808@ignoranthack.me> References: <555B638E.4020405@ignoranthack.me> <20150519165332.GA36377@spindle.one-eyed-alien.net> <555B91E8.9010309@ignoranthack.me> <20150519202153.GB36377@spindle.one-eyed-alien.net> <555BE7A1.3040808@ignoranthack.me>
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--HlL+5n6rz5pIUxbD Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, May 19, 2015 at 06:47:13PM -0700, Sean Bruno wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA512 >=20 > On 05/19/15 13:21, Brooks Davis wrote: > > On Tue, May 19, 2015 at 12:41:28PM -0700, Sean Bruno wrote: On > > 05/19/15 09:53, Brooks Davis wrote: > >>>> On Tue, May 19, 2015 at 09:23:42AM -0700, Sean Bruno wrote:=20 > >>>> Following the External Tool Chain instructions on the wiki > >>>> seem to not work: https://wiki.freebsd.org/ExternalToolchain > >>>>=20 > >>>> I've gotten about this far:=20 > >>>> https://people.freebsd.org/~sbruno/clang_head_build_log.txt > >>>>=20 > >>>>> You need to delete=20 > >>>>> /home/sbruno/bsd/clang/build/bin/../lib/clang/3.7.0/include/std* > >>>>> and possibly also limits.h (it's broken for libstand on > >>>>> mips). If you use the ports/pkgs they do this. > >=20 > > This didn't seem to make any difference when xcompiling for AMD64, > > but I did run into a buildfailure which might mean I don't know > > what I'm doing: > >=20 > >> rm > >> /home/sbruno/bsd/clang/build/bin/../lib/clang/3.7.0/include/limits.h > > > >> should do get around this one. I hit this one on mips a few > >> weeks ago. > >=20 > >> It's a bug in upstream clang that the bundled limits.h doesn't=20 > >> #include_next <limits.h> with -ffreestanding. I've not had a > >> chance to submit a review request to fix it. > >=20 > >> -- Brooks > >>>>=20 > >>>> Two items of note. -- The bootstrap bits *completely* ignore > >>>> XCC and build with the host cc/c++ > >>>>=20 > >>>>> That's expected. In principle clang could be used as the > >>>>> cross compiler since it's multi-target, but gcc could never > >>>>> work unless the host and target are the same. > >>>>=20 > >>>> -- No documentation of what CFLAGS are required to build and > >>>> ignore warnings. > >>>>=20 > >>>>> It will change with every clang/gcc release. In practice > >>>>> you will need to either fix the warnings wack-a-mole style > >>>>> or set NO_WERROR in the environment. > >>>>=20 > >>>>> -- Brooks > >>>>=20 > >>>>=20 > >>>> Anyone out there have success doing this? > >>>>=20 > >>>> sean >=20 >=20 >=20 > Getting much closer, I think this is fixable, but maybe we need to > pass this upstream? > =3D=3D=3D> sys/boot/i386/boot2 (depend) > ln -sf > /home/sbruno/bsd/fbsd_head/sys/boot/i386/boot2/../../../i386/include > machine > /home/sbruno/bsd/clang/build/bin/clang -target > x86_64-unknown-freebsd11.0 > - --sysroot=3D/var/tmp/home/sbruno/bsd/fbsd_head/tmp > - -B/var/tmp/home/sbruno/bsd/fbsd_head/tmp/usr/bin -fomit-frame-pointer > -mrtd -mregparm=3D3 -DUSE_XREAD -DUFS1_AND_UFS2 -DFLAGS=3D0x80 > - -DSIOPRT=3D0x3f8 -DSIOFMT=3D0x3 -DSIOSPD=3D9600 > - -I/home/sbruno/bsd/fbsd_head/sys/boot/i386/boot2/../../common > - -I/home/sbruno/bsd/fbsd_head/sys/boot/i386/boot2/../btx/lib -I. -Wall > - -Waggregate-return -Wbad-function-cast -Wcast-align > - -Wmissing-declarations -Wmissing-prototypes -Wnested-externs > - -Wpointer-arith -Wshadow -Wstrict-prototypes -Wwrite-strings -Winline > - -march=3Di386 -ffreestanding -mno-mmx -mno-3dnow -mno-sse -mno-sse2 > - -mno-sse3 -msoft-float -m32 -std=3Dgnu99 -Oz -mstack-alignment=3D8 > - -mllvm -inline-threshold=3D3 -mllvm -simplifycfg-dup-ret -mllvm > - -enable-gvn=3Dfalse -Qunused-arguments -no-integrated-as -m32 -c > /home/sbruno/bsd/fbsd_head/sys/boot/i386/boot2/boot1.S -o boot1.o > clang (LLVM option parsing): Unknown command line argument > '-enable-gvn=3Dfalse'. Try: 'clang (LLVM option parsing) -help' > clang (LLVM option parsing): Did you mean '-enable-pre=3Dfalse'? > *** Error code 1 IIRC -enable-gvn=3Dfalse is a local option Dimitry added to our clang. I d= on't remember the suggested workaround off hand. -- Brooks --HlL+5n6rz5pIUxbD Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQEcBAEBAgAGBQJVXBMSAAoJEKzQXbSebgfAyG4H/jAy//hjfmvVTjoGh/3xXLfk gCSwO1or7JdY4JqTpXALQZe9o+OHlCrxITxZjRs3pAf/KCk1yKiibdV78YN54tAb XATzC+L0BOFAGyCmHcSwdArCswOfmWmROGYb0CkbJzSybU3QUpE6Th3/416KY7+a +PDI613yTKYYd0V6iTxa1Bfz3BRf3+01OUp47UC/mxTU1K4yjy5iGO3JL6T42IGX Ep8R+8BQqNoLX43FESqKaXQAwWLMf6olJHMDwpTD5Xv5bAM+aA8ZahYcVGTA135F 4grCl4DgvDGvkGIdm5NO20hZMROb+sXs8HUn/D+eKuyoAmcfKeXzYah++h6U6q0= =VXvd -----END PGP SIGNATURE----- --HlL+5n6rz5pIUxbD--
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