Re: [OMPI users] Open MPI on 64 bits intel Mac OS X

[Massimo Cafaro]

Brian,




Cheers,
Massimo

On Sep 28, 2007, at 3:28 PM, Brian Barrett wrote:

thank you very much for your suggestion. I have succesfully recompiled Open MPI for 64 bits and it works like a charm. Anyway, it would be nice to have this option available as a configure switch.

On Sep 28, 2007, at 4:56 AM, Massimo Cafaro wrote:

Dear all,

when I try to compile my MPI code on 64 bits intel Mac OS X the
build fails since the Open MPI library has been compiled using 32
bits. Can you please provide in the next version the ability at
configure time to choose between 32 and 64 bits or even better
compile by defaults using both modes?

To reproduce the problem, simply compile on 64 bits intel Mac OS X
an MPI application using mpicc -arch x86_64. The 64 bits linker
complains as follows:

ld64 warning: in /usr/local/mpi/lib/libmpi.dylib, file is not of
required architecture
ld64 warning: in /usr/local/mpi/lib/libopen-rte.dylib, file is not
of required architecture
ld64 warning: in /usr/local/mpi/lib/libopen-pal.dylib, file is not
of required architecture

and a number of undefined symbols is shown, one for each MPI
function used in the application.

This is already possible.  Simply use the configure options:

   ./configure ... CFLAGS="-arch x86_64" CXXFLAGS="-arch x86_64"
OBJCFLAGS="-arch x86_64"

also set FFLAGS and FCFLAGS to "-m64" if you have gfortran/g95
compiler installed.  The common installs of either don't speak the -
arch option, so you have to use the more traditional -m64.

Hope this helps,

Brian
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 Dept. of Engineering for Innovation        SPACI Consortium
 University of Salento, Lecce, Italy

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