Copy OpenCV binaries once to prevent sporadic build failure on Windows (#254)

Author: aobolensk

app/Graph/CMakeLists.txt

@@ -22,18 +22,6 @@ target_link_libraries(Graph_Build BuildGraph)
 add_executable(ACC acc_check.cpp)
 target_link_libraries(ACC BuildGraph)
 
-if (WIN32)
-    add_custom_command(TARGET Graph_Build POST_BUILD
-        COMMAND ${CMAKE_COMMAND} -E copy_directory
-            "${OPENCV_BUILD_DIR}/bin/."
-            "${CMAKE_BINARY_DIR}/bin/")
-
-    add_custom_command(TARGET ACC POST_BUILD
-        COMMAND ${CMAKE_COMMAND} -E copy_directory
-            "${OPENCV_BUILD_DIR}/bin/."
-            "${CMAKE_BINARY_DIR}/bin/")
-endif()
-
 file(DOWNLOAD
     "https://raw.githubusercontent.com/DeepTrackAI/MNIST_dataset/main/mnist/test/1_000008.png"
     "${CMAKE_SOURCE_DIR}/docs/input/28/test1.png"

cmake/opencv_config.cmake

@@ -21,3 +21,10 @@ execute_process(
     COMMAND ${CMAKE_COMMAND} --build "${OPENCV_BUILD_DIR}" --config "${CMAKE_BUILD_TYPE}"
     WORKING_DIRECTORY "${OPENCV_BUILD_DIR}"
 )
+
+if(WIN32)
+    file(GLOB OPENCV_DLLS "${OPENCV_BUILD_DIR}/bin/*.dll")
+    if(OPENCV_DLLS)
+        file(COPY ${OPENCV_DLLS} DESTINATION "${CMAKE_BINARY_DIR}/bin")
+    endif()
+endif()

test/CMakeLists.txt

@@ -15,10 +15,6 @@ target_include_directories(run_test PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}")
 target_include_directories(run_test PRIVATE "${CMAKE_SOURCE_DIR}/app/ReaderImage")
 
 if (WIN32)
-    add_custom_command(TARGET run_test POST_BUILD
-        COMMAND ${CMAKE_COMMAND} -E copy_directory
-            "${OPENCV_BUILD_DIR}/bin/."
-            "${CMAKE_BINARY_DIR}/bin/")
     add_custom_command(TARGET run_test POST_BUILD
         COMMAND ${CMAKE_COMMAND} -E copy
             $<TARGET_FILE:dnnl>