Open MPI "Hello, World!" is not compiling - c++

Question

Here is a simple MPI "Hello, World!" program.
#include <stdio.h>
#include <mpi.h>
int main(int argc, char **argv)
{
int size, rank;
MPI_Init(&argc, &argv);
MPI_Comm_size(MPI_COMM_WORLD, &size);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
printf("SIZE = %d RANK = %d\n",size,rank);
MPI_Finalize();
return(0);
}
However, it doesn't seem to compile:
Undefined first referenced
symbol in file
MPI::Datatype::Free() /var/tmp//ccE6aG2w.o
MPI::Win::Free() /var/tmp//ccE6aG2w.o
MPI::Comm::Comm() /var/tmp//ccE6aG2w.o
ld: fatal: symbol referencing errors. No output written to main
collect2: ld returned 1 exit status
I've googled a lot, viewed mailing lists, thousands of them. They say libmpi_cxx is not linking. But it's in the compiler flags.
Here is --showme data:
mpic++ --showme:compile
-I/usr/openmpi/ompi-1.5/include -I/usr/openmpi/ompi-1.5/include/openmpi
mpic++ --showme:link
-R/opt/mx/lib -R/usr/openmpi/ompi-1.5/lib -L/usr/openmpi/ompi-1.5/lib -lmpi -lopen-rte -lopen-pal -lnsl -lrt -lm -ldl -lsocket -lmpi_cxx
My compiler is g++.

Answer 1

Just place the mpi.h header file above all header files
sometimes that causes problem to compile
I am not sure how u execute your code.
Compiling
mpic++ your_code_file.c
Execution
mpirun -np <no. of Processors> ./a.out

Answer 2

A few notes:
Note that Open MPI 1.5 is ancient. Please upgrade to the latest version in the Open MPI 1.6.x series (which is currently 1.6.3, but note that the www.open-mpi.org web site is currently undergoing a planned year-end maintenance and won't be back up until later today, Thursday, December 28, 2012).
I'm curious: why are you compiling a C program with mpic++? You only need to use mpicc -- the C MPI wrapper compiler. That would definitely avoid your issue. However, if you are using this small C hello world program as a simple example and your actual target is to compile a C++ MPI program, then mpic++ is the correct wrapper to try (even with a simple C program). If that's the case, then you have some kind of incompatibility / misconfiguration between your C++ compiler and the C++ compiler that Open MPI was compiled/installed with.
Looking at your mpic++ --showme output, it looks like you have some kind of package distribution of Open MPI -- -R is not put in the flags by default, for example. Where did you get this Open MPI installation? It's quite possible that it is not (fully) compatible with your g++ installation (e.g., if it was compiled with a different version of g++).
That being said, your mpic++ --showme output is also weird in that it lists -lmpi_cxx at the end of the line. It should be to the left of -lmpi, not to the right of it. I'm not show how your installation got borked like that, but that is another possible cause.
So to sum up, my answer is:
Please try upgrading Open MPI and see if the problem goes away.
Double check that your installation of Open MPI is compatible with your system.

Answer 3

It is a also much easer and more flexible to compile openmpi and mpi programs in a "Eclipse for Parallel Application Developers" IDE.
http://www.eclipse.org/downloads/packages/eclipse-parallel-application-developers/junosr1