The MPI-window wrappers use the old F90 mpi module (instead of mpi_f08) but type(c_ptr) as argument type for pointers, which is strictly only valid when using mpi_f08.
Possible solution
One would have to upgrade the entire library to use mpi_f08 all over.
Converting the pointer argument types to integer(mpi_address_kind) to be compatible with the f90 mpi module is not a real option, as subsequent c_f_pointer() would not work due to type-mismatch.
Currently, MPIFX can not be built with MPICH 4.x.
Problem
The MPI-window wrappers use the old F90
mpimodule (instead ofmpi_f08) buttype(c_ptr)as argument type for pointers, which is strictly only valid when usingmpi_f08.Possible solution
One would have to upgrade the entire library to use
mpi_f08all over.Converting the pointer argument types to
integer(mpi_address_kind)to be compatible with the f90 mpi module is not a real option, as subsequentc_f_pointer()would not work due to type-mismatch.