OpenMPI is often available from package managers across computing platforms. Users might build OpenMPI from source to get the latest version or to support other compilers. OpenMPI takes several minutes to build.
./configure --prefix=~/.local/openmpi CC=gcc CXX=g++ FC=gfortran
Don’t just use
~/.local as that spills OpenMPI files into common directories, making it hard to use multiple OpenMPI versions or multiple compilers.
Build and install OpenMPI:
make -j make install # no sudo
Linux: add to “~/.profile”:
CMake module allows switching between multiple OpenMPI versions installed with
cmake -DMPI_ROOT=~/.local/openmpi ..
As in general for CMake packages, the MPI imported target is highly recommended over the legacy discrete variables, as in this minimal
find_package(MPI REQUIRED COMPONENTS Fortran) add_executable(mpivers mpivers.f90) target_link_libraries(mpivers MPI::MPI_Fortran)
If it doesn’t work with CMake, try
If that works, try something like:
FC=gfortran CC=gcc cmake -DMPI_Fortran_COMPILER=~/.local/openmpi/bin/mpif90 ..