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From: Philip Li <philip.li@intel.com>
To: kbuild-all@lists.01.org
Subject: Re: [linux-review:UPDATE-20200603-033008/Nathan-Chancellor/s390-vdso-Use-LD-instead-of-CC-to-link-vDSO/20200528-140859 1/1] ld.lld: error: unknown argument '-fPIC'
Date: Thu, 11 Jun 2020 08:51:44 +0800
Message-ID: <20200611005144.GA10966@intel.com>
In-Reply-To: <CAKwvOd=pCUmhhCazgg5bM5QHxeXo40NAwkTqer9MweGhCXkK7w@mail.gmail.com>
List-Id: <oe-kbuild-all.lists.linux.dev>

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On Wed, Jun 10, 2020 at 04:30:45PM -0700, Nick Desaulniers wrote:
> On Wed, Jun 10, 2020 at 4:04 PM 'Fangrui Song' via Clang Built Linux
> <clang-built-linux@googlegroups.com> wrote:
> >
> >
> > On 2020-06-10, 'Nick Desaulniers' via Clang Built Linux wrote:
> > >On Wed, Jun 10, 2020 at 12:43 PM kernel test robot <lkp@intel.com> w=
rote:
> > >>
> > >> TO: Nathan Chancellor <natechancellor@gmail.com>
> > >> CC: 0day robot <lkp@intel.com>
> > >>
> > >> tree:   https://github.com/0day-ci/linux/commits/UPDATE-20200603-033=
008/Nathan-Chancellor/s390-vdso-Use-LD-instead-of-CC-to-link-vDSO/20200528-=
140859
> > >> head:   b19361026b76f9167c9206f654b12f53023550d1
> > >> commit: b19361026b76f9167c9206f654b12f53023550d1 [1/1] s390: vdso: U=
se $(LD) instead of $(CC) to link vDSO
> > >> config: s390-randconfig-r021-20200607 (attached as .config)
> > >> compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project=
 bc2b70982be8f5250cd0082a7190f8b417bd4dfe)
> > >> reproduce (this is a W=3D1 build):
> > >>         wget https://raw.githubusercontent.com/intel/lkp-tests/maste=
r/sbin/make.cross -O ~/bin/make.cross
> > >>         chmod +x ~/bin/make.cross
> > >>         # install s390 cross compiling tool for clang build
> > >>         # apt-get install binutils-s390-linux-gnu
> > >>         git checkout b19361026b76f9167c9206f654b12f53023550d1
> > >>         # save the attached .config to linux build tree
> > >>         COMPILER_INSTALL_PATH=3D$HOME/0day COMPILER=3Dclang make.cro=
ss ARCH=3Ds390
> > >>
> > >> If you fix the issue, kindly add following tag as appropriate
> > >> Reported-by: kernel test robot <lkp@intel.com>
> > >>
> > >> All errors (new ones prefixed by >>, old ones prefixed by <<):
> > >>
> > >> >> ld.lld: error: unknown argument '-fPIC'
> > >> ld.lld: error: unknown emulation: elf64_s390
> > >
> > >^ is this another inconsistency we have with emulation modes, or is
> > >this completely unsupported in LLD?
> >
> > LLD does not support EM_S390. I don't know anyone is working on it (or
> > is interested at the support).
> =

> Ah right, Nathan confirmed no LLD support for s390. Philip, we may
> need to not use LD=3Dld.lld for s390.  Not sure about the second error
> message.
Got it, we will remove the usage of ld.lld for s390.

> =

> >
> > > ld.lld: error: unknown argument '-fPIC'
> >
> > There may be a build system bug.
> >
> > In GNU ld, -f --auxillary is an option. -fPIC is not:
> >
> > % ld.bfd -fPIC -shared a.o
> > % readelf -d a.out | grep PIC
> >   0x000000007ffffffd (AUXILIARY)          Auxiliary library: [PIC]
> >
> -- =

> Thanks,
> ~Nick Desaulniers
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