Generic MPI project Makefile

HelloMPI.cpp

#include <iostream>
#include <mpi.h>

int main(int argc, char *argv[])
{

    MPI_Init(NULL, NULL);

    int rank;
    int process_count;

    int err = MPI_Comm_size(MPI_COMM_WORLD, &process_count);
    if (err != 0)
    {
        std::cerr << "Getting comm size failed\n";
        return err;
    }

    err = MPI_Comm_rank(MPI_COMM_WORLD, &rank);
    if (err != 0)
    {
        std::cerr << "Getting process rank failed\n";
        return err;
    }

    for (int i = 1; i < argc; ++i)
    {
        std::cout << "Process " << rank << " of " << process_count << ": " << argv[i] << "\n";
    }

    MPI_Finalize();
    return 0;
}

Makefile

# Set desired executable name
TARGET = HelloMPI

# Set number of processes to spawn when running TARGET with mpiexec
PROCESS_COUNT = 4

# Set desired g++ options
GCC_FLAGS = -Wall -g -Og

# Set any options to pass to mpiexec
RUN_OPTIONS = --mca btl_base_warn_component_unused 0 \
	-n ${PROCESS_COUNT}

# Set command line args for TARGET
RUN_ARGS = "Hello" "World"

# Locate all .cpp files in project and strip the .cpp extension
FILES := $(shell find . -type f -name '*.cpp' -printf '%P\n' | sed 's/\.cpp//')

# Add .o extension to all discovered .cpp files
OBJS = $(addsuffix .o, ${FILES})


# Shell commands
GCC = mpiCC
RUN = mpiexec ${RUN_OPTIONS}

run: ${TARGET}
	${RUN} $< ${RUN_ARGS}

${TARGET}: ${OBJS}
	${GCC} -o $@ $^

%.o: %.cpp
	${GCC} ${GCC_FLAGS} -o $@ -c $<

clean:
	${RM} $(shell find . -type f -name '*\.o')
	${RM} ${TARGET}