reserved flags parameter for future usage

modules/gpu/include/opencv2/gpu/gpu.hpp

@@ -921,7 +921,7 @@ CV_EXPORTS void graphcut(GpuMat& terminals, GpuMat& leftTransp, GpuMat& rightTra
 CV_EXPORTS void connectivityMask(const GpuMat& image, GpuMat& mask, const cv::Scalar& lo, const cv::Scalar& hi, Stream& stream = Stream::Null());
 
 //! performs connected componnents labeling.
-CV_EXPORTS void labelComponents(const GpuMat& mask, GpuMat& components, Stream& stream = Stream::Null());
+CV_EXPORTS void labelComponents(const GpuMat& mask, GpuMat& components, int flags = 0, Stream& stream = Stream::Null());
 
 ////////////////////////////////// Histograms //////////////////////////////////
 

modules/gpu/src/graphcuts.cpp

@@ -48,7 +48,7 @@ void cv::gpu::graphcut(GpuMat&, GpuMat&, GpuMat&, GpuMat&, GpuMat&, GpuMat&, Gpu
 void cv::gpu::graphcut(GpuMat&, GpuMat&, GpuMat&, GpuMat&, GpuMat&, GpuMat&, GpuMat&, GpuMat&, GpuMat&, GpuMat&, GpuMat&, Stream&) { throw_nogpu(); }
 
 void cv::gpu::connectivityMask(const GpuMat&, GpuMat&, const cv::Scalar&, const cv::Scalar&, Stream&) { throw_nogpu(); }
-void cv::gpu::labelComponents(const GpuMat& mask, GpuMat& components, Stream& stream) { throw_nogpu(); }
+void cv::gpu::labelComponents(const GpuMat& mask, GpuMat& components, int, Stream& stream) { throw_nogpu(); }
 
 #else /* !defined (HAVE_CUDA) */
 
@@ -106,7 +106,7 @@ void cv::gpu::connectivityMask(const GpuMat& image, GpuMat& mask, const cv::Scal
     f(image, mask, culo, cuhi, stream);
 }
 
-void cv::gpu::labelComponents(const GpuMat& mask, GpuMat& components, Stream& s)
+void cv::gpu::labelComponents(const GpuMat& mask, GpuMat& components, int flags, Stream& s)
 {
     CV_Assert(!mask.empty() && mask.type() == CV_8U);
 
@@ -114,7 +114,7 @@ void cv::gpu::labelComponents(const GpuMat& mask, GpuMat& components, Stream& s)
         components.create(mask.size(), CV_32SC1);
 
     cudaStream_t stream = StreamAccessor::getStream(s);
-    device::ccl::labelComponents(mask, components, 0, stream);
+    device::ccl::labelComponents(mask, components, flags, stream);
 }
 
 namespace