Added build warnings in case of macro definition conflicts

modules/core/include/opencv2/core/utility.hpp

@@ -49,6 +49,10 @@
 #  error utility.hpp header must be compiled as C++
 #endif
 
+#if defined(check)
+#  warning Detected Apple 'check' macro definition, it can cause build conflicts. Please, include this header before any Apple headers.
+#endif
+
 #include "opencv2/core.hpp"
 
 namespace cv

modules/stitching/include/opencv2/stitching/detail/blenders.hpp

@@ -43,6 +43,10 @@
 #ifndef __OPENCV_STITCHING_BLENDERS_HPP__
 #define __OPENCV_STITCHING_BLENDERS_HPP__
 
+#if defined(NO)
+#  warning Detected Apple 'NO' macro definition, it can cause build conflicts. Please, include this header before any Apple headers.
+#endif
+
 #include "opencv2/core.hpp"
 
 namespace cv {

modules/stitching/include/opencv2/stitching/detail/exposure_compensate.hpp

@@ -43,6 +43,10 @@
 #ifndef __OPENCV_STITCHING_EXPOSURE_COMPENSATE_HPP__
 #define __OPENCV_STITCHING_EXPOSURE_COMPENSATE_HPP__
 
+#if defined(NO)
+#  warning Detected Apple 'NO' macro definition, it can cause build conflicts. Please, include this header before any Apple headers.
+#endif
+
 #include "opencv2/core.hpp"
 
 namespace cv {