Build fixes for case where HAVE_CUDA==OFF.

modules/core/CMakeLists.txt

 set(the_description "The Core Functionality")
 
-if (ENABLE_DYNAMIC_CUDA)
+if (NOT HAVE_CUDA OR ENABLE_DYNAMIC_CUDA)
   ocv_add_module(core PRIVATE_REQUIRED ${ZLIB_LIBRARIES})
 else()
   ocv_add_module(core PRIVATE_REQUIRED ${ZLIB_LIBRARIES} ${CUDA_LIBRARIES} ${CUDA_npp_LIBRARY})
@@ -15,7 +15,9 @@ endif()
 if(ENABLE_DYNAMIC_CUDA)
   add_definitions(-DDYNAMIC_CUDA_SUPPORT)
 else()
-  add_definitions(-DUSE_CUDA)
+  if (HAVE_CUDA)
+    add_definitions(-DUSE_CUDA)
+  endif()
 endif()
 
 if(HAVE_CUDA)
@@ -26,18 +28,18 @@ endif()
 file(GLOB lib_cuda_hdrs        "include/opencv2/${name}/cuda/*.hpp"        "include/opencv2/${name}/cuda/*.h")
 file(GLOB lib_cuda_hdrs_detail "include/opencv2/${name}/cuda/detail/*.hpp" "include/opencv2/${name}/cuda/detail/*.h")
 
-if (NOT ENABLE_DYNAMIC_CUDA)
-  file(GLOB lib_cuda               "../dynamicuda/src/cuda/*.cu*")
+if (HAVE_CUDA AND NOT ENABLE_DYNAMIC_CUDA)
+  file(GLOB lib_cuda           "../dynamicuda/src/cuda/*.cu*")
 endif()
 
 source_group("Cuda Headers"         FILES ${lib_cuda_hdrs})
 source_group("Cuda Headers\\Detail" FILES ${lib_cuda_hdrs_detail})
 
-if (NOT ENABLE_DYNAMIC_CUDA)
+if (HAVE_CUDA AND NOT ENABLE_DYNAMIC_CUDA)
   source_group("Src\\Cuda"      FILES ${lib_cuda} ${lib_cuda_hdrs})
 endif()
 
-if (ENABLE_DYNAMIC_CUDA)
+if (NOT HAVE_CUDA OR ENABLE_DYNAMIC_CUDA)
   ocv_glob_module_sources(SOURCES "${opencv_core_BINARY_DIR}/version_string.inc"
                           HEADERS ${lib_cuda_hdrs} ${lib_cuda_hdrs_detail})
 else()

modules/core/src/gpumat.cpp

@@ -229,7 +229,7 @@ static DeviceInfoFuncTable* deviceInfoFuncTable()
    static CudaDeviceInfoFuncTable impl;
    static DeviceInfoFuncTable* funcTable = &impl;
 #else
-   static EmptyFuncTable stub;
+   static EmptyDeviceInfoFuncTable stub;
    static DeviceInfoFuncTable* funcTable = &stub;
 #endif
 #endif

samples/cpp/stitching_detailed.cpp

@@ -355,7 +355,7 @@ int main(int argc, char* argv[])
     Ptr<FeaturesFinder> finder;
     if (features_type == "surf")
     {
-#if defined(HAVE_OPENCV_NONFREE) && defined(HAVE_OPENCV_GPU)
+#if defined(HAVE_OPENCV_NONFREE) && defined(HAVE_OPENCV_GPU) && !defined(ANDROID)
         if (try_gpu && gpu::getCudaEnabledDeviceCount() > 0)
             finder = new SurfFeaturesFinderGpu();
         else
@@ -543,7 +543,7 @@ int main(int argc, char* argv[])
     // Warp images and their masks
 
     Ptr<WarperCreator> warper_creator;
-#ifdef HAVE_OPENCV_GPU
+#if defined(HAVE_OPENCV_GPU) && !defined(ANDROID)
     if (try_gpu && gpu::getCudaEnabledDeviceCount() > 0)
     {
         if (warp_type == "plane") warper_creator = new cv::PlaneWarperGpu();
@@ -608,7 +608,7 @@ int main(int argc, char* argv[])
         seam_finder = new detail::VoronoiSeamFinder();
     else if (seam_find_type == "gc_color")
     {
-#ifdef HAVE_OPENCV_GPU
+#if defined(HAVE_OPENCV_GPU) && !defined(ANDROID)
         if (try_gpu && gpu::getCudaEnabledDeviceCount() > 0)
             seam_finder = new detail::GraphCutSeamFinderGpu(GraphCutSeamFinderBase::COST_COLOR);
         else
@@ -617,7 +617,7 @@ int main(int argc, char* argv[])
     }
     else if (seam_find_type == "gc_colorgrad")
     {
-#ifdef HAVE_OPENCV_GPU
+#if defined(HAVE_OPENCV_GPU) && !defined(ANDROID)
         if (try_gpu && gpu::getCudaEnabledDeviceCount() > 0)
             seam_finder = new detail::GraphCutSeamFinderGpu(GraphCutSeamFinderBase::COST_COLOR_GRAD);
         else