suppress noisy warning

  * add -Wno-psabi when using GCC 6
  * add -Wundef for CUDA 10
  * add -Wdeprecated-declarations when using GCC 7
  * add -Wstrict-aliasing and -Wtautological-compare for GCC 7
  * replace cudaThreadSynchronize with cudaDeviceSynchronize

cmake/OpenCVCompilerOptions.cmake

@@ -121,6 +121,9 @@ if(CV_GCC OR CV_CLANG)
   add_extra_compiler_option(-Wsign-promo)
   add_extra_compiler_option(-Wuninitialized)
   add_extra_compiler_option(-Winit-self)
+  if(CV_GCC AND (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 6.0) AND (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 7.0))
+    add_extra_compiler_option(-Wno-psabi)
+  endif()
   if(HAVE_CXX11)
     if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND NOT ENABLE_PRECOMPILED_HEADERS)
       add_extra_compiler_option(-Wsuggest-override)

modules/cudalegacy/CMakeLists.txt

@@ -4,7 +4,7 @@ endif()
 
 set(the_description "CUDA-accelerated Computer Vision (legacy)")
 
-ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4127 /wd4130 /wd4324 /wd4512 /wd4310 -Wundef -Wmissing-declarations -Wuninitialized -Wshadow)
+ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4127 /wd4130 /wd4324 /wd4512 /wd4310 -Wundef -Wmissing-declarations -Wuninitialized -Wshadow -Wdeprecated-declarations -Wstrict-aliasing -Wtautological-compare)
 
 ocv_define_module(cudalegacy opencv_core opencv_video
   OPTIONAL opencv_objdetect opencv_imgproc opencv_calib3d opencv_cudaarithm opencv_cudafilters opencv_cudaimgproc)

modules/cudaobjdetect/CMakeLists.txt

@@ -4,6 +4,6 @@ endif()
 
 set(the_description "CUDA-accelerated Object Detection")
 
-ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4127 /wd4324 /wd4512 -Wundef -Wmissing-declarations -Wshadow)
+ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4127 /wd4324 /wd4512 -Wundef -Wmissing-declarations -Wshadow -Wstrict-aliasing)
 
 ocv_define_module(cudaobjdetect opencv_objdetect opencv_cudaarithm opencv_cudawarping OPTIONAL opencv_cudalegacy)

modules/cudaobjdetect/src/cuda/hog.cu

@@ -448,7 +448,7 @@ namespace cv { namespace cuda { namespace device
            compute_confidence_hists_kernel_many_blocks<nthreads, nblocks><<<grid, threads>>>(
                    img_win_width, img_block_width, win_block_stride_x, win_block_stride_y,
                    block_hists, coefs, free_coef, threshold, confidences);
-           cudaSafeCall(cudaThreadSynchronize());
+           cudaSafeCall(cudaDeviceSynchronize());
        }
 
 

modules/cudaoptflow/CMakeLists.txt

@@ -4,6 +4,6 @@ endif()
 
 set(the_description "CUDA-accelerated Optical Flow")
 
-ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4127 /wd4324 /wd4512 -Wundef -Wmissing-declarations -Wshadow)
+ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4127 /wd4324 /wd4512 -Wundef -Wmissing-declarations -Wshadow -Wstrict-aliasing)
 
 ocv_define_module(cudaoptflow opencv_video opencv_cudaarithm opencv_cudawarping opencv_cudaimgproc OPTIONAL opencv_cudalegacy)

modules/dnn/CMakeLists.txt

@@ -31,7 +31,9 @@ else()
                                        -Wunused-parameter -Wsign-compare
   )
 endif()
-
+if(HAVE_CUDA)
+  ocv_warnings_disable(CMAKE_CXX_FLAGS -Wundef)
+endif()
 if(NOT HAVE_CXX11)
   ocv_warnings_disable(CMAKE_CXX_FLAGS -Wno-undef)  # LANG_CXX11 from protobuf files
 endif()

modules/stitching/CMakeLists.txt

 set(the_description "Images stitching")
 
 if(HAVE_CUDA)
-  ocv_warnings_disable(CMAKE_CXX_FLAGS -Wundef -Wmissing-declarations -Wshadow)
+  ocv_warnings_disable(CMAKE_CXX_FLAGS -Wundef -Wmissing-declarations -Wshadow -Wstrict-aliasing)
 endif()
 
 set(STITCHING_CONTRIB_DEPS "opencv_xfeatures2d")