CODEWITHSUNDEEP
c++boostmpi
Dair
Dair

Reputation: 16240

Boost.MPI gives Undefined symbols for architecture x86_64

I am trying to run the basic "Hello, World!" example:

#include <boost/mpi/environment.hpp>
#include <boost/mpi/communicator.hpp>
#include <iostream>
namespace mpi = boost::mpi;

int main()
{
  mpi::environment env;
  mpi::communicator world;
  std::cout << "I am process " << world.rank() << " of " << world.size()
            << "." << std::endl;
  return 0;
}

I have tried numerous variants for running this program:

mpic++ -I /usr/local/include/ test.cpp -o test -lboost_system

also:

mpic++ -I /usr/local/include/boost test.cpp -o test -lboost_system

and using mpicc, and clang++ as a substitute. Each combination gives the follow error:

Undefined symbols for architecture x86_64:
  "boost::mpi::environment::environment(bool)", referenced from:
      _main in test-b0215f.o
  "boost::mpi::environment::~environment()", referenced from:
      _main in test-b0215f.o
  "boost::mpi::communicator::communicator()", referenced from:
      _main in test-b0215f.o
  "boost::mpi::communicator::rank() const", referenced from:
      _main in test-b0215f.o
  "boost::mpi::communicator::size() const", referenced from:
      _main in test-b0215f.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Homebrew says that both MPICH2 and boost1.63.0 are installed. I can confirm that mpic++ runs by compiling and then running this program:

   // required MPI include file  
   #include "mpi.h"
   #include <stdio.h>

   int main(int argc, char *argv[]) {
   int  numtasks, rank, len, rc; 
   char hostname[MPI_MAX_PROCESSOR_NAME];

   // initialize MPI  
   MPI_Init(&argc,&argv);

   // get number of tasks 
   MPI_Comm_size(MPI_COMM_WORLD,&numtasks);

   // get my rank  
   MPI_Comm_rank(MPI_COMM_WORLD,&rank);

   // this one is obvious  
   MPI_Get_processor_name(hostname, &len);
   printf ("Number of tasks= %d My rank= %d Running on %s\n", numtasks,rank,hostname);


        // do some work with message passing 


   // done with MPI  
   MPI_Finalize();
   }

Which produces the correct output.

I have also verified that (at least part of) Boost is installed by compiling and successfully running the Boost "Hello, World!"

//
// timer.cpp
// ~~~~~~~~~
//
// Copyright (c) 2003-2016 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//

#include <iostream>
#include <boost/asio.hpp>
#include <boost/date_time/posix_time/posix_time.hpp>

int main()
{
  boost::asio::io_service io;

  boost::asio::deadline_timer t(io, boost::posix_time::seconds(5));
  t.wait();

  std::cout << "Hello, world!" << std::endl;

  return 0;
}

with:

clang++ -I /usr/local/include/ timer.cpp -o timer -lboost_system

How can I get the Boost.MPI example to run?

Upvotes: 0

Views: 837

Answers (1)

overseas
overseas

Reputation: 1731

When you get linker errors from boost, you usually forgot to link against a boost library.

There is also a boost_mpi library, so you should compile with

clang++ -I /usr/local/include/ timer.cpp -o timer -lboost_system -lboost_mpi

Note that you need a boost version with support for mpi.

Upvotes: 1

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