From a3b19719774df52099880d05af0e4ff1e4a48426 Mon Sep 17 00:00:00 2001
From: Andrey Kamaev <andrey.kamaev@itseez.com>
Date: Mon, 15 Oct 2012 17:48:49 +0400
Subject: [PATCH] Bring back escaped virtual destructors from 2.4.2

---
 cmake/OpenCVCompilerOptions.cmake                         | 8 +++++++-
 modules/core/include/opencv2/core/core.hpp                | 8 ++++++--
 modules/core/src/matrix.cpp                               | 4 ++++
 modules/flann/include/opencv2/flann/any.h                 | 3 +++
 .../include/opencv2/videostab/motion_stabilizing.hpp      | 2 ++
 5 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/cmake/OpenCVCompilerOptions.cmake b/cmake/OpenCVCompilerOptions.cmake
index ecc0c52e4e..e84957b755 100644
--- a/cmake/OpenCVCompilerOptions.cmake
+++ b/cmake/OpenCVCompilerOptions.cmake
@@ -56,12 +56,18 @@ if(MINGW)
   endif()
 endif()
 
+if(OPENCV_CAN_BREAK_BINARY_COMPATIBILITY)
+  add_definitions(-DOPENCV_CAN_BREAK_BINARY_COMPATIBILITY)
+endif()
+
 if(CMAKE_COMPILER_IS_GNUCXX)
   # High level of warnings.
   add_extra_compiler_option(-W)
   add_extra_compiler_option(-Wall)
   add_extra_compiler_option(-Werror=return-type)
-  #add_extra_compiler_option(-Werror=non-virtual-dtor)
+  if(OPENCV_CAN_BREAK_BINARY_COMPATIBILITY)
+    add_extra_compiler_option(-Werror=non-virtual-dtor)
+  endif()
   add_extra_compiler_option(-Werror=address)
   add_extra_compiler_option(-Werror=sequence-point)
   add_extra_compiler_option(-Wformat)
diff --git a/modules/core/include/opencv2/core/core.hpp b/modules/core/include/opencv2/core/core.hpp
index 3493beca93..c6c9aa3e1d 100644
--- a/modules/core/include/opencv2/core/core.hpp
+++ b/modules/core/include/opencv2/core/core.hpp
@@ -1345,7 +1345,9 @@ public:
     virtual int channels(int i=-1) const;
     virtual bool empty() const;
 
-    /*virtual*/ ~_InputArray();
+#ifdef OPENCV_CAN_BREAK_BINARY_COMPATIBILITY
+    virtual ~_InputArray();
+#endif
 
     int flags;
     void* obj;
@@ -1407,7 +1409,9 @@ public:
     virtual void release() const;
     virtual void clear() const;
 
-    /*virtual*/ ~_OutputArray();
+#ifdef OPENCV_CAN_BREAK_BINARY_COMPATIBILITY
+    virtual ~_OutputArray();
+#endif
 };
 
 typedef const _InputArray& InputArray;
diff --git a/modules/core/src/matrix.cpp b/modules/core/src/matrix.cpp
index e30fcfe1a3..6ef4d8dee9 100644
--- a/modules/core/src/matrix.cpp
+++ b/modules/core/src/matrix.cpp
@@ -917,7 +917,9 @@ void scalarToRawData(const Scalar& s, void* _buf, int type, int unroll_to)
 \*************************************************************************************************/
 
 _InputArray::_InputArray() : flags(0), obj(0) {}
+#ifdef OPENCV_CAN_BREAK_BINARY_COMPATIBILITY
 _InputArray::~_InputArray() {}
+#endif
 _InputArray::_InputArray(const Mat& m) : flags(MAT), obj((void*)&m) {}
 _InputArray::_InputArray(const vector<Mat>& vec) : flags(STD_VECTOR_MAT), obj((void*)&vec) {}
 _InputArray::_InputArray(const double& val) : flags(FIXED_TYPE + FIXED_SIZE + MATX + CV_64F), obj((void*)&val), sz(Size(1,1)) {}
@@ -1281,7 +1283,9 @@ bool _InputArray::empty() const
 
 
 _OutputArray::_OutputArray() {}
+#ifdef OPENCV_CAN_BREAK_BINARY_COMPATIBILITY
 _OutputArray::~_OutputArray() {}
+#endif
 _OutputArray::_OutputArray(Mat& m) : _InputArray(m) {}
 _OutputArray::_OutputArray(vector<Mat>& vec) : _InputArray(vec) {}
 _OutputArray::_OutputArray(gpu::GpuMat& d_mat) : _InputArray(d_mat) {}
diff --git a/modules/flann/include/opencv2/flann/any.h b/modules/flann/include/opencv2/flann/any.h
index dc0b9481a2..89189c64ef 100644
--- a/modules/flann/include/opencv2/flann/any.h
+++ b/modules/flann/include/opencv2/flann/any.h
@@ -47,7 +47,10 @@ struct base_any_policy
     virtual ::size_t get_size() = 0;
     virtual const std::type_info& type() = 0;
     virtual void print(std::ostream& out, void* const* src) = 0;
+
+#ifdef OPENCV_CAN_BREAK_BINARY_COMPATIBILITY
     virtual ~base_any_policy() {}
+#endif
 };
 
 template<typename T>
diff --git a/modules/videostab/include/opencv2/videostab/motion_stabilizing.hpp b/modules/videostab/include/opencv2/videostab/motion_stabilizing.hpp
index eb3199482e..493e6fa739 100644
--- a/modules/videostab/include/opencv2/videostab/motion_stabilizing.hpp
+++ b/modules/videostab/include/opencv2/videostab/motion_stabilizing.hpp
@@ -56,7 +56,9 @@ namespace videostab
 class CV_EXPORTS IMotionStabilizer
 {
 public:
+#ifdef OPENCV_CAN_BREAK_BINARY_COMPATIBILITY
     virtual ~IMotionStabilizer() {}
+#endif
 
     // assumes that [0, size-1) is in or equals to [range.first, range.second)
     virtual void stabilize(