about BYPRODUCTS bin/opencv-340.jar
configure_file("${CMAKE_CURRENT_SOURCE_DIR}/build.xml.in" "${OPENCV_JAVA_DIR}/build.xml" @ONLY)
list(APPEND depends "${OPENCV_JAVA_DIR}/build.xml")
+ocv_cmake_byproducts(__byproducts BYPRODUCTS "${OPENCV_JAR_FILE}")
add_custom_command(OUTPUT "${OPENCV_DEPHELPER}/${the_module}_jar"
+ ${__byproducts} # required for add_custom_target() by ninja
COMMAND ${ANT_EXECUTABLE} -noinput -k jar
COMMAND ${CMAKE_COMMAND} -E touch "${OPENCV_DEPHELPER}/${the_module}_jar"
WORKING_DIRECTORY "${OPENCV_JAVA_DIR}"