Add option to control build of applications (feature #2568)

CMakeLists.txt

@@ -149,6 +149,7 @@ OCV_OPTION(WITH_OPENCLAMDBLAS  "Include AMD OpenCL BLAS library support"     OFF
 # OpenCV build components
 # ===================================================
 OCV_OPTION(BUILD_SHARED_LIBS        "Build shared libraries (.dll/.so) instead of static ones (.lib/.a)" NOT (ANDROID OR IOS) )
+OCV_OPTION(BUILD_opencv_apps        "Build utility applications (used for example to train classifiers)" (NOT ANDROID) IF (NOT IOS) )
 OCV_OPTION(BUILD_ANDROID_EXAMPLES   "Build examples for Android platform"         ON  IF ANDROID )
 OCV_OPTION(BUILD_DOCS               "Create build rules for OpenCV Documentation" ON )
 OCV_OPTION(BUILD_EXAMPLES           "Build all examples"                          OFF )
@@ -453,7 +454,9 @@ add_subdirectory(doc)
 add_subdirectory(data)
 
 # extra applications
-add_subdirectory(apps)
+if(BUILD_opencv_apps)
+  add_subdirectory(apps)
+endif()
 
 # examples
 if(BUILD_EXAMPLES OR BUILD_ANDROID_EXAMPLES OR INSTALL_PYTHON_EXAMPLES)

apps/haartraining/CMakeLists.txt

-if(IOS OR ANDROID)
-  return()
-endif()
-
 SET(OPENCV_HAARTRAINING_DEPS opencv_core opencv_imgproc opencv_highgui opencv_objdetect opencv_calib3d opencv_video opencv_features2d opencv_flann opencv_legacy)
 ocv_check_dependencies(${OPENCV_HAARTRAINING_DEPS})
 

apps/traincascade/CMakeLists.txt

-if(IOS OR ANDROID)
-  return()
-endif()
-
 SET(OPENCV_TRAINCASCADE_DEPS opencv_core opencv_ml opencv_imgproc opencv_objdetect opencv_highgui opencv_calib3d opencv_video opencv_features2d opencv_flann opencv_legacy)
 ocv_check_dependencies(${OPENCV_TRAINCASCADE_DEPS})