if (WITH_MPI)
  set(MPI_SOURCES
     ${CMAKE_CURRENT_SOURCE_DIR}/openems_fdtd_mpi.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/operator_mpi.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/engine_mpi.cpp
     )
endif()

set(SOURCES
  ${SOURCES}
  ${MPI_SOURCES}
  ${CMAKE_CURRENT_SOURCE_DIR}/engine.cpp
  ${CMAKE_CURRENT_SOURCE_DIR}/operator.cpp
  ${CMAKE_CURRENT_SOURCE_DIR}/engine_multithread.cpp
  ${CMAKE_CURRENT_SOURCE_DIR}/operator_cylinder.cpp
  ${CMAKE_CURRENT_SOURCE_DIR}/engine_cylinder.cpp
  ${CMAKE_CURRENT_SOURCE_DIR}/engine_sse.cpp
  ${CMAKE_CURRENT_SOURCE_DIR}/operator_sse.cpp
  ${CMAKE_CURRENT_SOURCE_DIR}/operator_sse_compressed.cpp
  ${CMAKE_CURRENT_SOURCE_DIR}/engine_sse_compressed.cpp
  ${CMAKE_CURRENT_SOURCE_DIR}/operator_multithread.cpp
  ${CMAKE_CURRENT_SOURCE_DIR}/excitation.cpp
  ${CMAKE_CURRENT_SOURCE_DIR}/operator_cylindermultigrid.cpp
  ${CMAKE_CURRENT_SOURCE_DIR}/engine_cylindermultigrid.cpp
  ${CMAKE_CURRENT_SOURCE_DIR}/engine_interface_fdtd.cpp
  ${CMAKE_CURRENT_SOURCE_DIR}/engine_interface_sse_fdtd.cpp
  ${CMAKE_CURRENT_SOURCE_DIR}/engine_interface_cylindrical_fdtd.cpp
  PARENT_SCOPE
)