message: COMP: fix typos breaking the build when MPI is OFF
diff: using MPI_Datatype = int;
  constexpr int MPI_INT8_T = -1;
  constexpr int MPI_UINT8_T = -1;
  +constexpr int MPI_INT16_T = -1;
  +constexpr int MPI_UINT16_T = -1;
  constexpr int MPI_INT32_T = -1;
  constexpr int MPI_UINT32_T = -1;
  constexpr int MPI_INT64_T = -1;
  @@ -62,7 +64,7 @@ void check_mpi_type( std::size_t expected_num_bytes,
  /* silence compiler warnings */
  static_cast< void >( expected_num_bytes );
  - static_cast< void >( mpi_type );
  + static_cast< void >( expected_mpi_type );
  #endif /* AXOM_USE_MPI */
  }
  