[Dune] error running code with MPI

[Christian Engwer]

On Fri, Sep 03, 2010 at 06:27:31PM +0200, Vogelbacher Florian wrote:
> Hi Christian,
> 
> I just made a distclean and recompiled with this flag to make sure
> it is everywhere "seen". The bug is however still there. Do I have
> to recompile all other packages (ALUGrid, metis, ...) with this kind

I'm not sure about ALUGrid. But you will be on the safe side!

Christian

> of flag as well?
> 
> I wish you and the Dune-Team a wonderful weekend.
> Florian
> 
> Christian Engwer wrote:
> >Hi Florian,
> >
> >>no, I did not use this kind of flag :-)
> >>
> >>I'm using an opts file to compile dune. Do I have to include it into
> >>the CXXFLAGS or somewhere else as well?
> >
> >OK, this _might_ be the reason for your strange bugs. The problem is,
> >that DUNE does break strict aliasing.
> >
> >>dune.opts.file:
> >>
> >>CONFIGURE_FLAGS="CXX='mpicxx' CC='mpicc' LD='mpicxx'
> >>CXXFLAGS='-DMPICH_IGNORE_CXX_SEEK -O2'
> >>CPPFLAGS='-DMPICH_IGNORE_CXX_SEEK -O2'
> >>LDFLAGS=' '
> >>          --disable-documentation
> >>          --enable-parallel
> >>          --enable-debug-output
> >>          --with-boost='$HOME/extlib-scratch3-felsim/boost-trunk'
> >>          --with-metis='$HOME/extlib-scratch3-felsim/metis-4.0'
> >>          --with-rlog='$HOME/extlib-scratch3-felsim/rlog-1.4'
> >>          --with-alugrid='$HOME/extlib-scratch3-felsim/ALUGrid-1.22'"
> >
> >Yes, you have to add it to the CXXFLAGS listed in the CONFIGURE_FLAGS.
> >
> >Btw. DUNE tries to support MPI without the need to invoke the mpi
> >compiler directly. It detects quite a range of MPI compilers and
> >extract the CXXFLAGS and the LDFLAGS. In this case it would be
> >sufficient to use CXX='g++-4.3' or what ever compiler you want to use
> >and specify the mpi compiler as MPICC=/path-to-mpi/mpicc. If DUNE
> >doesn't detect your MPI compiler correctly, it would be great if you
> >could help us adding support for this mpi version.
> >
> >Hope it works now :-)
> >Christian
>