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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: Jeffrey Squyres (jsquyres_at_[hidden])
Date: 2012-03-20 11:36:41


Can you build with g++ instead of icpc?

All the C++ MPI bindings are inlined anyway, so the performance difference between the two might be negligible.

On Mar 20, 2012, at 11:35 AM, Gunter, David O wrote:

> 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:
>
> libmpi.so: undefined reference to `__intel_sse2_strcpy'
>
> and other messages for every single Intel-implemented standard C-function.
>
> -david
> --
> 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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>
>
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-- 
Jeff Squyres
jsquyres_at_[hidden]
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