GPU: bring back CUDPP_OPT

    set_property(CACHE GPU_PREC PROPERTY STRINGS SINGLE_DOUBLE SINGLE_SINGLE DOUBLE_DOUBLE)

    add_definitions(-D_${GPU_PREC})

    add_definitions(-DNV_KERNEL -DUCL_CUDADR)

    option(CUDPP_OPT "Enable CUDPP_OPT" ON)

    set(GPU_SOURCES_DIR ${LAMMPS_SOURCE_DIR}/GPU)

    set(GPU_SOURCES ${GPU_SOURCES_DIR}/gpu_extra.h)

    file(GLOB GPU_LIB_CU ${LAMMPS_LIB_SOURCE_DIR}/gpu/*.cu ${CMAKE_SOURCE_DIR}/gpu/*.cu)

    file(GLOB_RECURSE GPU_NOT_LIB_CU ${LAMMPS_LIB_SOURCE_DIR}/gpu/lal_pppm.cu)

    list(REMOVE_ITEM GPU_LIB_CU ${GPU_NOT_LIB_CU})

    include_directories(${GPU_SOURCES_DIR} ${LAMMPS_LIB_SOURCE_DIR}/gpu

      ${LAMMPS_LIB_SOURCE_DIR}/gpu/cudpp_mini ${LAMMPS_LIB_BINARY_DIR}/gpu)

    cuda_compile(GPU_OBJS ${GPU_LIB_CU} OPTIONS $<$<BOOL:${BUILD_SHARED_LIBS}>:-Xcompiler=-fPIC>)    

    include_directories(${GPU_SOURCES_DIR} ${LAMMPS_LIB_SOURCE_DIR}/gpu ${LAMMPS_LIB_BINARY_DIR}/gpu)

    if(CUDPP_OPT)

      include_directories(${LAMMPS_LIB_SOURCE_DIR}/gpu/cudpp_mini)

      add_definitions(-DCUDPP_OPT)

      file(GLOB GPU_LIB_CUDPP_SOURCES ${LAMMPS_LIB_SOURCE_DIR}/gpu/cudpp_mini/*.cpp)

      file(GLOB GPU_LIB_CUDPP_CU ${LAMMPS_LIB_SOURCE_DIR}/gpu/cudpp_mini/*.cu)

    endif()

    cuda_compile(GPU_OBJS ${GPU_LIB_CU} ${GPU_LIB_CUDPP_CU} OPTIONS $<$<BOOL:${BUILD_SHARED_LIBS}>:-Xcompiler=-fPIC>)    

    file(MAKE_DIRECTORY ${LAMMPS_LIB_BINARY_DIR}/gpu)

    foreach(CU_OBJ ${GPU_OBJS})

      get_filename_component(CU_NAME ${CU_OBJ} NAME_WE)

      endif()

    endforeach()

    list(REMOVE_ITEM GPU_OBJS "${CU_FORBIDDEN_OBJ}")

    list(APPEND LIB_SOURCES ${GPU_SOURCES} ${GPU_LIB_SOURCES} ${GPU_OBJS})

    list(APPEND LIB_SOURCES ${GPU_SOURCES} ${GPU_LIB_SOURCES} ${GPU_LIB_CUDPP_SOURCES} ${GPU_OBJS})

    set_directory_properties(PROPERTIES ADDITIONAL_MAKE_CLEAN_FILES "${AMMPS_LIB_BINARY_DIR}/gpu/*_cubin.h")

endif()