[Boost-users] Boost.MPI - compilation problems

From: Tom Smith (thrsmith_at_[hidden])
Date: 2008-03-05 10:45:53

Hi,

I seem to be having similar problems to this post:
http://lists.boost.org/boost-users/2007/10/31648.php

My MPI implementation is MPICH2; the first example in the docs at
http://www.osl.iu.edu/~dgregor/boost.mpi/doc/mpi/tutorial.html works
fine (this just creates a communicator  and prints each process'
rank).

The second example in the tutorial (with recv and send):

#include <boost/mpi.hpp>
#include <iostream>
#include <boost/serialization/string.hpp>
namespace mpi = boost::mpi;

int main(int argc, char* argv[])
{
  mpi::environment env(argc, argv);
  mpi::communicator world;

  if (world.rank() == 0) {
    world.send(1, 0, std::string("Hello"));
    std::string msg;
    world.recv(1, 1, msg);
    std::cout << msg << "!" << std::endl;
  } else {
    std::string msg;
    world.recv(0, 0, msg);
    std::cout << msg << ", ";
    std::cout.flush();
    world.send(0, 1, std::string("world"));
  }

  return 0;
}

fails to link: output on g++ 4.0.1 on OSX 10.5 is

Undefined symbols:
  "boost::mpi::communicator::operator int() const", referenced from:
      boost::mpi::status
boost::mpi::communicator::recv_impl<std::basic_string<char,
std::char_traits<char>, std::allocator<char> > >(int, int,
std::basic_string<char, std::char_traits<char>, std::allocator<char>
>&, mpl_::bool_<false>) constin ccxddhyu.o
      void boost::mpi::communicator::send_impl<std::basic_string<char,
std::char_traits<char>, std::allocator<char> > >(int, int,
std::basic_string<char, std::char_traits<char>, std::allocator<char> >
const&, mpl_::bool_<false>) constin ccxddhyu.o
ld: symbol(s) not found

My compiled invocation (which as mentioned compiles the first tutorial
example) is just

mpic++ -lboost_mpi-mt -lboost_serialization-mt main.cpp

The problem (as for the person in the post I linked at the top) seems
to be that mpi::communicator defines a conversion operator to
MPI_Comm, which is just a typedef for int in MPICH2, but somehow the
correct operator isn't found in the compiled lib..
Unlike the person in the linked post, I haven't had any other MPI
libraries installed before, so there should be no inconsistencies.

This problem occurs with 32 and 64-bit compiled libs built from
subversion repos. code today.

Thanks

Tom