[cfe-dev] clang on BGQ

[Paolo Crosetto]

Dear Michal and Hal,
thanks for the replies! Michael if you already have a working backend
version for JUQUEEN could you share it?
Thanks!

Paolo

On Wed, 17 Apr 2013 13:29:35 -0500
Hal Finkel <hfinkel at anl.gov> wrote:

> ----- Original Message -----
> > From: "Michael Kruse" <cfe-dev at meinersbur.de>
> > To: "Paolo Crosetto" <p.crosetto at fz-juelich.de>
> > Cc: cfe-dev at cs.uiuc.edu
> > Sent: Wednesday, April 17, 2013 12:06:37 PM
> > Subject: Re: [cfe-dev] clang on BGQ
> >
> > Hello,
> >
> > there is a backend for BG/Q CNKs available here:
> > http://lists.alcf.anl.gov/pipermail/llvm-bgq-discuss/2013-March/000131.html
> > (The .bin file is a .tar.gz)
> >
> > It contains a wrapper script "bgclang" that will link against the
> > CNK CRT. To run on Juqueen, you will need to patch the clang driver
> > to put
> > the directory /usr/lib64 after the cross-compile specific library
> > search paths. Otherwise it will try to link the frontend CRT. Also
> > you
> > will need to edit hard-coded paths in a lot of places.
> >
> > For also using MPI on the nodes, there are MPI compiler wrappers
> > available with the older patches at
> > http://trac.alcf.anl.gov/projects/llvm-bgq
>
> These older wrapper scripts don't match the V1R2 MPI release; I'll
> can send updated versions to the llvm-bgq-discuss list
> (https://lists.alcf.anl.gov/mailman/listinfo/llvm-bgq-discuss). Let
> me know once you've subscribed there. The wrapper scripts, etc. are
> system specific, and will likely never be submitted upstream.
>
> >
> > It also generates QPX intrinsics, but in my experience so far, it's
> > buggy.
>
> I intend to upstream the QPX support, but I might not get to it until
> after the 3.3 cutoff. I've been working this month and last on a long
> list of non-QPX specific improvements to the PowerPC backend, and
> these things have gone upstream first.
>
> In any case, there are no QPX bugs of which I know, and there are
> several groups using my QPX-enabled builds. I'll fix whatever bugs
> Michael has found too, as soon as he tells me what they are ;) We
> should move this discussion onto the llvm-bgq-discuss list as it does
> not involve upstream features.
>
>  -Hal
>
> >
> > I have clang running on Juqueen. If you are interested, it might be
> > easier to copy my files.
> >
> > Good luck,
> > Michael Kruse
> >
> >
> > 2013/4/17 Paolo Crosetto <p.crosetto at fz-juelich.de>:
> > > Dear developers,
> > >
> > > I recently compiled the git snapshot of clang on an IBM Blue
> > > Gene/Q supercomputer, however the compiler produces executables
> > > for the front-end node, while I should cross-compile to create
> > > executables for
> > > the compute nodes. I tried to gather some information googling how
> > > to set up a clang cross compiler but I couldn't figure it out.
> > > Does anyone have suggestions?
> > > Thanks!
> > >
> > > Paolo
> > >
> > >
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> >



--
______________________________

Dr. P. Crosetto

HSFSE Simulation Lab
Juelich Supercomputing Center
Forschungszentrum Juelich


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Forschungszentrum Juelich GmbH
52425 Juelich
Sitz der Gesellschaft: Juelich
Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. HR B 3498
Vorsitzender des Aufsichtsrats: MinDir Dr. Karl Eugen Huthmacher
Geschaeftsfuehrung: Prof. Dr. Achim Bachem (Vorsitzender),
Karsten Beneke (stellv. Vorsitzender), Prof. Dr.-Ing. Harald Bolt,
Prof. Dr. Sebastian M. Schmidt
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