apps: add opencv_version command line tool

apps/CMakeLists.txt

@@ -6,3 +6,4 @@ add_subdirectory(createsamples)
 add_subdirectory(annotation)
 add_subdirectory(visualisation)
 add_subdirectory(interactive-calibration)
+add_subdirectory(version)

apps/version/CMakeLists.txt

+SET(OPENCV_APPLICATION_DEPS opencv_core opencv_highgui opencv_imgproc opencv_imgcodecs opencv_videoio)
+ocv_check_dependencies(${OPENCV_APPLICATION_DEPS})
+
+if(NOT OCV_DEPENDENCIES_FOUND)
+  return()
+endif()
+
+project(opencv_version)
+set(the_target opencv_version)
+
+ocv_target_include_directories(${the_target} PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}" "${OpenCV_SOURCE_DIR}/include/opencv")
+ocv_target_include_modules_recurse(${the_target} ${OPENCV_APPLICATION_DEPS})
+
+file(GLOB SRCS *.cpp)
+
+ocv_add_executable(${the_target} ${SRCS})
+ocv_target_link_libraries(${the_target} ${OPENCV_APPLICATION_DEPS})
+
+set_target_properties(${the_target} PROPERTIES
+                      DEBUG_POSTFIX "${OPENCV_DEBUG_POSTFIX}"
+                      RUNTIME_OUTPUT_DIRECTORY ${EXECUTABLE_OUTPUT_PATH}
+                      OUTPUT_NAME "opencv_version")
+
+set_target_properties(${the_target} PROPERTIES FOLDER "applications")
+
+if(INSTALL_CREATE_DISTRIB)
+  if(BUILD_SHARED_LIBS)
+    install(TARGETS ${the_target} RUNTIME DESTINATION ${OPENCV_BIN_INSTALL_PATH} CONFIGURATIONS Release COMPONENT libs)
+  endif()
+else()
+  install(TARGETS ${the_target} RUNTIME DESTINATION ${OPENCV_BIN_INSTALL_PATH} COMPONENT libs)
+endif()

apps/version/opencv_version.cpp

+// This file is part of OpenCV project.
+// It is subject to the license terms in the LICENSE file found in the top-level directory
+// of this distribution and at http://opencv.org/license.html.
+
+#include <iostream>
+
+#include <opencv2/core.hpp>
+
+int main(int argc, const char** argv)
+{
+    cv::CommandLineParser parser(argc, argv,
+        "{ help h usage ? |      | show this help message }"
+        "{ verbose v      |      | show build configuration log }"
+    );
+    if (parser.has("help"))
+    {
+        parser.printMessage();
+    }
+    else if (parser.has("verbose"))
+    {
+        std::cout << cv::getBuildInformation().c_str() << std::endl;
+    }
+    else
+    {
+        std::cout << CV_VERSION << std::endl;
+    }
+    return 0;
+}