build: xcode 12 support

modules/intensity_transform/src/bimef.cpp

@@ -234,7 +234,7 @@ static Mat solveLinearEquation(const Mat_<float>& img, Mat_<float>& W_h_, Mat_<f
         }
     );
 
-    return tout;
+    return std::move(tout);
 }
 
 static Mat_<float> tsmooth(const Mat_<float>& src, float lambda=0.01f, float sigma=3.0f, float sharpness=0.001f)

modules/rgbd/src/submap.hpp

@@ -499,7 +499,7 @@ PoseGraph SubmapManager<MatType>::MapToPoseGraph()
     PoseGraph localPoseGraph;
 
 
-    for(const Ptr<SubmapT> currSubmap : submapList)
+    for(const auto& currSubmap : submapList)
     {
         const typename SubmapT::Constraints& constraintList = currSubmap->constraints;
         for(const auto& currConstraintPair : constraintList)
@@ -512,7 +512,7 @@ PoseGraph SubmapManager<MatType>::MapToPoseGraph()
         }
     }
 
-    for(const Ptr<SubmapT> currSubmap : submapList)
+    for(const auto& currSubmap : submapList)
     {
         PoseGraphNode currNode(currSubmap->id, currSubmap->pose);
         if(currSubmap->id == 0)
@@ -530,7 +530,7 @@ PoseGraph SubmapManager<MatType>::MapToPoseGraph()
 template <typename MatType>
 void SubmapManager<MatType>::PoseGraphToMap(const PoseGraph &updatedPoseGraph)
 {
-    for(const Ptr<SubmapT> currSubmap : submapList)
+    for(const auto& currSubmap : submapList)
     {
         const PoseGraphNode& currNode = updatedPoseGraph.nodes.at(currSubmap->id);
         if(!currNode.isPoseFixed())

modules/sfm/src/libmv_light/CMakeLists.txt

@@ -7,7 +7,7 @@ ocv_warnings_disable(CMAKE_CXX_FLAGS -Winconsistent-missing-override -Wsuggest-o
 if(CV_GCC AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 8.0)
   ocv_warnings_disable(CMAKE_CXX_FLAGS -Wclass-memaccess)
 endif()
-if(CV_GCC AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 9.0)
+if((CV_GCC AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 9.0) OR CV_CLANG)
   ocv_warnings_disable(CMAKE_CXX_FLAGS -Wdeprecated-copy)
 endif()