Re: [Qemu-devel] [PATCH PULL 02/31] contrib/rdmacm-mux: Add implementation of RDMA User MAD multiplexer

[Cornelia Huck <cohuck@redhat.com>]

On Tue, 8 Jan 2019 10:41:38 +0200
Marcel Apfelbaum <marcel.apfelbaum@gmail.com> wrote:

> On 1/7/19 7:54 PM, Cornelia Huck wrote:
> > On Mon, 7 Jan 2019 19:28:10 +0200
> > Marcel Apfelbaum <marcel.apfelbaum@gmail.com> wrote:
> >  
> >> On 1/3/19 12:34 PM, Cornelia Huck wrote:  

> >>> clang-6.0: error: -libumad: 'linker' input unused [-Werror,-Wunused-command-line-argument]  
> >> Is really strange, the rdma-mux is part of the contrib directory
> >> and is not even compiled by default.
> >>  
> >>> Explicitly passing --disable-pvrdma to configure disables the offending
> >>> code.
> >>>
> >>> Let me know if you need more information.  
> >> Can you please send the exact steps you are using to configure and
> >> compile QEMU,
> >> are you compiling on a x86 machine?  
> > Yes, this is on my laptop (up-to-date F28). I can reproduce on current
> > master, configured with
> >
> > ../configure --target-list="s390x-softmmu s390x-linux-user i386-softmmu x86_64-softmmu cris-softmmu arm-softmmu ppc64-softmmu" --enable-linux-aio --enable-virtfs --enable-trace-backends=simple --cc=clang --enable-rdma --enable-pvrdma
> >
> > It compiles if I pass --disable-pvrdma instead. It also compiles if I
> > drop --cc=clang.
> >
> > I'm building in a build subdirectory; I have already tried purging it
> > before rebuilding, without luck.
> >
> > clang --version says
> >
> > clang version 6.0.1 (tags/RELEASE_601/final)
> > Target: x86_64-unknown-linux-gnu
> > Thread model: posix
> > InstalledDir: /usr/bin  
> 
> Thanks for the information, I will look into it.
> Marcel

Thanks.

Another data point: I see the same on a Fedora 29 on s390x, so this
does not seem to be a broken local setup (unless I managed to mess up
both systems in the same way...) clang --version says

clang version 7.0.0 (Fedora 7.0.0-2.fc29)
Target: s390x-ibm-linux
Thread model: posix
InstalledDir: /usr/bin