SolverInterface with MPI.COMM_WORLD not working

[BenjaminRodenberg]

I just tried to run the following script:

import precice
from mpi4py import MPI

solver_interface = precice.Interface("SolverOne", "precice-config.xml", 0, 1, MPI.COMM_WORLD)

It unfortunately resulted in a segmentation fault.

Note that we actually have a test for this case:

python-bindings/test/test_bindings_module.pyx

Lines 21 to 23 in 8463bf1

	def test_constructor_custom_mpi_comm(self):
	solver_interface = precice.Interface("test", "dummy.xml", 0, 1, MPI.COMM_WORLD)
	self.assertTrue(True)

However, it is not actually testing what we want it to test. I assume this is due to the mocked up preCICE version that we use for testing hiding problems with MPI.