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Subject: Re: [OMPI users] [EXTERNAL] Possible to build ompi-1.4.3 or 1.4.5 without a C++ compiler?
From: Gunter, David O (dog_at_[hidden])
Date: 2012-03-20 11:35:30

I wish it were that easy. When I go that route, I get error messages like the following when trying to compile the parallel code with Intel: undefined reference to `__intel_sse2_strcpy'

and other messages for every single Intel-implemented standard C-function.


David Gunter
HPC-3: Infrastructure Team
Los Alamos National Laboratory
On Mar 20, 2012, at 8:18 AM, Barrett, Brian W wrote:
> On 3/20/12 10:06 AM, "Gunter, David O" <dog_at_[hidden]> wrote:
>> I need to build ompi-1.4.3 (or the newer 1.4.5) with an older Intel 10.0
>> compiler, but on a newer system in which the default g++ headers are
>> incompatible with Intel. Thus the C and Fortran compilers function
>> normally but the Intel C++ compiler fails to build even a simple "hello
>> world" code.
>> Is there a way to build OMPI without a C++ compiler?  I tried using the
>> --disable-mpi-cxx and --disable-mpi-cxx-seek flags but these are just for
>> the resulting bindings. The configure step still continues to search for
>> a working C++ compiler.
>> Yes, I know I can upgrade the Intel compiler but we don't have that as an
>> option in this case.
> Unfortunately, you're a bit out of luck.  Open MPI 1.4.x requires C++ even
> if you're not building the C++ bindings.  This is not true of 1.5.x and
> later.
> If you don't need the C++ bindings, I would build Open MPI with GNU C and
> C++ and Intel Fortran.  After building, edit
> <PREFIX>/share/openmpi/mpicc-wrapper-data.txt to change the compiler=gcc
> line to compiler=<intel C compiler>.  There's not going to be much
> performance difference between the two compilers for Open MPI itself.  GNU
> C and Intel C are link compatible, so that should work out for you and the
> users will never be the wiser.
> Brian
> -- 
>  Brian W. Barrett
>  Dept. 1423: Scalable System Software
>  Sandia National Laboratories
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