From d34717d8c9759f15b3920f428b7616c418e0511c Mon Sep 17 00:00:00 2001
From: Alexander Alekhin <alexander.a.alekhin@gmail.com>
Date: Sun, 4 Oct 2020 15:11:55 +0000
Subject: [PATCH] core: allow to disable including of
 unsupported/Eigen/CXX11/Tensor

- define OPENCV_DISABLE_EIGEN_TENSOR_SUPPORT
---
 modules/core/include/opencv2/core/eigen.hpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/modules/core/include/opencv2/core/eigen.hpp b/modules/core/include/opencv2/core/eigen.hpp
index 3f4be931e6..51f41474bd 100644
--- a/modules/core/include/opencv2/core/eigen.hpp
+++ b/modules/core/include/opencv2/core/eigen.hpp
@@ -58,11 +58,13 @@
 #pragma warning( disable: 4244 ) //conversion from '__int64' to 'int', possible loss of data
 #endif
 
+#if !defined(OPENCV_DISABLE_EIGEN_TENSOR_SUPPORT)
 #if EIGEN_WORLD_VERSION == 3 && EIGEN_MAJOR_VERSION >= 3 \
     && defined(CV_CXX11) && defined(CV_CXX_STD_ARRAY)
 #include <unsupported/Eigen/CXX11/Tensor>
-#define OPENCV_EIGEN_TENSOR_SUPPORT
-#endif // EIGEN_WORLD_VERSION == 3 && EIGEN_MAJOR_VERSION >= 3
+#define OPENCV_EIGEN_TENSOR_SUPPORT 1
+#endif  // EIGEN_WORLD_VERSION == 3 && EIGEN_MAJOR_VERSION >= 3
+#endif  // !defined(OPENCV_DISABLE_EIGEN_TENSOR_SUPPORT)
 
 namespace cv
 {