-- CUDA detected: 10.0
CMake Warning at cmake/OpenCVDetectCUDA.cmake:191 (message):
  COMMAND:
  /usr/local/cuda-10.0/bin/nvcc;-ccbin;/usr/bin/cc;/mnt/sd/opencv-fork/cmake/checks/OpenCVDetectCudaArch.cu;--run
Call Stack (most recent call first):
  cmake/OpenCVDetectCUDA.cmake:243 (ocv_detect_native_cuda_arch)
  cmake/OpenCVFindLibsPerf.cmake:43 (include)
  CMakeLists.txt:688 (include)


-- Result: 1
-- Out:
-- Err:
-- Automatic detection of CUDA generation failed. Going to build for all known architectures.

if(CMAKE_GENERATOR MATCHES "Visual Studio")
  set(CUDA_HOST_COMPILER "$(VCInstallDir)bin" CACHE FILEPATH "Host side compiler used by NVCC")
else()
  if(APPLE
      AND "${CMAKE_C_COMPILER_ID}" MATCHES "Clang"
      AND "${CMAKE_C_COMPILER}" MATCHES "/cc$")
    # Using cc which is symlink to clang may let NVCC think it is GCC and issue
    # unhandled -dumpspecs option to clang. Also in case neither
    # CMAKE_C_COMPILER is defined (project does not use C language) nor
    # CUDA_HOST_COMPILER is specified manually we should skip -ccbin and let
    # nvcc use its own default C compiler.
    # Only care about this on APPLE with clang to avoid
    # following symlinks to things like ccache
    if(DEFINED CMAKE_C_COMPILER AND NOT DEFINED CUDA_HOST_COMPILER)
      get_filename_component(c_compiler_realpath "${CMAKE_C_COMPILER}" REALPATH)
      # if the real path does not end up being clang then
      # go back to using CMAKE_C_COMPILER
      if(NOT "${c_compiler_realpath}" MATCHES "/clang$")
        set(c_compiler_realpath "${CMAKE_C_COMPILER}")
      endif()
    else()
      set(c_compiler_realpath "")
    endif()
    set(CUDA_HOST_COMPILER "${c_compiler_realpath}" CACHE FILEPATH "Host side compiler used by NVCC")
  else()
    set(CUDA_HOST_COMPILER "${CMAKE_C_COMPILER}"  <=========== This lines always get hit on Jetson
      CACHE FILEPATH "Host side compiler used by NVCC")
  endif()
endif()

time cmake -DOPENCV_EXTRA_MODULES_PATH=/path/to/opencv_contrib/modules -DBUILD_EXAMPLES=true -DOPENCV_ENABLE_NONFREE=true -DWITH_CUDA=ON -DOPENCV_CMAKE_CUDA_DEBUG=1 ..