If the type is not available (e.g., *only* because the Fortran
compiler does not support it), the value may be MPI_DATATYPE_NULL */
{ MPI_REAL4, "MPI_REAL4" },
If the type is not available (e.g., *only* because the Fortran
compiler does not support it), the value may be MPI_DATATYPE_NULL */
{ MPI_REAL4, "MPI_REAL4" },