Troubleshooting

An Error Reported During the Compilation of the Geant4 Parallel Module

Symptom

When the geant4 parallel module was compiled, "G4MPImanager.hh:117:9: error: 'MPI' does not name a type; did you mean 'M_PI'?" is reported.

Possible Causes

By default, g++ binding is disabled for OpenMPI 4.0.1.

Procedure

Recompile OpenMPI 4.0.1 and add the --enable-mpi-cxx parameter when configuring OpenMPI. For details, see Step 5 in "Installing OpenMPI" in Basic Environment Setup Guide.