Update OpenCVDetectCUDA.cmake

Adds the option to enable delay loading of CUDA DLLs on Windows. This is particularly useful to use the same binary on systems with and without CUDA support without distributing the CUDA DLLs to systems that cannot use them at all due to missing CUDA-supported hardware.
Resolves #13509

diff --git a/cmake/OpenCVDetectCUDA.cmake b/cmake/OpenCVDetectCUDA.cmake
index acc101396c651aa92ebc57fb54c318333d5283ea..f7f054ac899d401fc19412b3cacb6cb82da28b59 100644 (file)
--- a/cmake/OpenCVDetectCUDA.cmake
+++ b/cmake/OpenCVDetectCUDA.cmake
@@ -342,6 +342,8 @@ if(CUDA_FOUND)
     set(CUDA_NVCC_FLAGS ${CUDA_NVCC_FLAGS} --use_fast_math)
   endif()
 
+  OCV_OPTION(CUDA_ENABLE_DELAYLOAD "Enable delayed loading of CUDA DLLs" OFF VISIBLE_IF MSVC AND (CMAKE_GENERATOR MATCHES "Visual Studio"))
+
   mark_as_advanced(CUDA_BUILD_CUBIN CUDA_BUILD_EMULATION CUDA_VERBOSE_BUILD CUDA_SDK_ROOT_DIR)
 
   macro(ocv_cuda_filter_options)
@@ -537,4 +539,15 @@ if(HAVE_CUDA)
       set(OPENCV_LINKER_LIBS ${OPENCV_LINKER_LIBS} ${CMAKE_LIBRARY_PATH_FLAG}${p})
     endif()
   endforeach()
+
+  if(MSVC AND CUDA_ENABLE_DELAYLOAD)
+    file(GLOB CUDA_DLLS "${CUDA_TOOLKIT_ROOT_DIR}/bin/*.dll")
+    foreach(d ${CUDA_DLLS})
+      cmake_path(GET "d" FILENAME DLL_NAME)
+      if(NOT ${DLL_NAME} MATCHES "cudart")
+        set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} /DELAYLOAD:${DLL_NAME}")
+      endif()
+    endforeach()
+    set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} /IGNORE:4199")
+  endif()
 endif()