Why would all these warnings happen?

C++
,
1 
/usr/include/opencv4/opencv2/core/mat.inl.hpp: In constructor ‘cv::_InputArray::_InputArray(const cv::Mat&)’:
/usr/include/opencv4/opencv2/core/mat.inl.hpp:103:57: warning: arithmetic between different enumeration types ‘cv::_InputArray::KindFlag’ and ‘cv::AccessFlag’ is deprecated [-Wdeprecated-enum-enum-conversion]
  103 | inline _InputArray::_InputArray(const Mat& m) { init(MAT+ACCESS_READ, &m); }
      |                                                      ~~~^~~~~~~~~~~~
/usr/include/opencv4/opencv2/core/mat.inl.hpp: In constructor ‘cv::_InputArray::_InputArray(const std::vector<cv::Mat>&)’:
/usr/include/opencv4/opencv2/core/mat.inl.hpp:104:83: warning: arithmetic between different enumeration types ‘cv::_InputArray::KindFlag’ and ‘cv::AccessFlag’ is deprecated [-Wdeprecated-enum-enum-conversion]
  104 | inline _InputArray::_InputArray(const std::vector<Mat>& vec) { init(STD_VECTOR_MAT+ACCESS_READ, &vec); }
      |                                                                     ~~~~~~~~~~~~~~^~~~~~~~~~~~
/usr/include/opencv4/opencv2/core/mat.inl.hpp: In constructor ‘cv::_InputArray::_InputArray(const cv::UMat&)’:
/usr/include/opencv4/opencv2/core/mat.inl.hpp:105:59: warning: arithmetic between different enumeration types ‘cv::_InputArray::KindFlag’ and ‘cv::AccessFlag’ is deprecated [-Wdeprecated-enum-enum-conversion]
  105 | inline _InputArray::_InputArray(const UMat& m) { init(UMAT+ACCESS_READ, &m); }
      |                                                       ~~~~^~~~~~~~~~~~
/usr/include/opencv4/opencv2/core/mat.inl.hpp: In constructor ‘cv::_InputArray::_InputArray(const std::vector<cv::UMat>&)’:
/usr/include/opencv4/opencv2/core/mat.inl.hpp:106:85: warning: arithmetic between different enumeration types ‘cv::_InputArray::KindFlag’ and ‘cv::AccessFlag’ is deprecated [-Wdeprecated-enum-enum-conversion]
  106 | inline _InputArray::_InputArray(const std::vector<UMat>& vec) { init(STD_VECTOR_UMAT+ACCESS_READ, &vec); }
      |                                                                      ~~~~~~~~~~~~~~~^~~~~~~~~~~~
/usr/include/opencv4/opencv2/core/mat.inl.hpp: In constructor ‘cv::_InputArray::_InputArray(const std::array<cv::Mat, _Nm>&)’:
/usr/include/opencv4/opencv2/core/mat.inl.hpp:118:22: warning: arithmetic between different enumeration types ‘cv::_InputArray::KindFlag’ and ‘cv::AccessFlag’ is deprecated [-Wdeprecated-enum-enum-conversion]
  118 | { init(STD_ARRAY_MAT + ACCESS_READ, arr.data(), Size(1, _Nm)); }
      |        ~~~~~~~~~~~~~~^~~~~~~~~~~~~
/usr/include/opencv4/opencv2/core/mat.inl.hpp: In constructor ‘cv::_InputArray::_InputArray(const cv::cuda::GpuMat&)’:
/usr/include/opencv4/opencv2/core/mat.inl.hpp:148:21: warning: arithmetic between different enumeration types ‘cv::_InputArray::KindFlag’ and ‘cv::AccessFlag’ is deprecated [-Wdeprecated-enum-enum-conversion]
  148 | { init(CUDA_GPU_MAT + ACCESS_READ, &d_mat); }
      |        ~~~~~~~~~~~~~^~~~~~~~~~~~~
/usr/include/opencv4/opencv2/core/mat.inl.hpp: In constructor ‘cv::_InputArray::_InputArray(const std::vector<cv::cuda::GpuMat>&)’:
/usr/include/opencv4/opencv2/core/mat.inl.hpp:151:38: warning: arithmetic between different enumeration types ‘cv::_InputArray::KindFlag’ and ‘cv::AccessFlag’ is deprecated [-Wdeprecated-enum-enum-conversion]
  151 | {       init(STD_VECTOR_CUDA_GPU_MAT + ACCESS_READ, &d_mat);}
      |              ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
/usr/include/opencv4/opencv2/core/mat.inl.hpp: In constructor ‘cv::_InputArray::_InputArray(const cv::ogl::Buffer&)’:
/usr/include/opencv4/opencv2/core/mat.inl.hpp:154:22: warning: arithmetic between different enumeration types ‘cv::_InputArray::KindFlag’ and ‘cv::AccessFlag’ is deprecated [-Wdeprecated-enum-enum-conversion]
  154 | { init(OPENGL_BUFFER + ACCESS_READ, &buf); }
      |        ~~~~~~~~~~~~~~^~~~~~~~~~~~~
/usr/include/opencv4/opencv2/core/mat.inl.hpp: In constructor ‘cv::_InputArray::_InputArray(const cv::cuda::HostMem&)’:
/usr/include/opencv4/opencv2/core/mat.inl.hpp:157:22: warning: arithmetic between different enumeration types ‘cv::_InputArray::KindFlag’ and ‘cv::AccessFlag’ is deprecated [-Wdeprecated-enum-enum-conversion]
  157 | { init(CUDA_HOST_MEM + ACCESS_READ, &cuda_mem); }
      |        ~~~~~~~~~~~~~~^~~~~~~~~~~~~
/usr/include/opencv4/opencv2/core/mat.inl.hpp: In constructor ‘cv::_OutputArray::_OutputArray()’:
/usr/include/opencv4/opencv2/core/mat.inl.hpp:200:49: warning: arithmetic between different enumeration types ‘cv::_InputArray::KindFlag’ and ‘cv::AccessFlag’ is deprecated [-Wdeprecated-enum-enum-conversion]
  200 | inline _OutputArray::_OutputArray() { init(NONE + ACCESS_WRITE, 0); }
      |                                            ~~~~~^~~~~~~~~~~~~~
/usr/include/opencv4/opencv2/core/mat.inl.hpp: In constructor ‘cv::_OutputArray::_OutputArray(cv::Mat&)’:
/usr/include/opencv4/opencv2/core/mat.inl.hpp:202:53: warning: arithmetic between different enumeration types ‘cv::_InputArray::KindFlag’ and ‘cv::AccessFlag’ is deprecated [-Wdeprecated-enum-enum-conversion]
  202 | inline _OutputArray::_OutputArray(Mat& m) { init(MAT+ACCESS_WRITE, &m); }
      |                                                  ~~~^~~~~~~~~~~~~
/usr/include/opencv4/opencv2/core/mat.inl.hpp: In constructor ‘cv::_OutputArray::_OutputArray(std::vector<cv::Mat>&)’:
/usr/include/opencv4/opencv2/core/mat.inl.hpp:203:80: warning: arithmetic between different enumeration types ‘cv::_InputArray::KindFlag’ and ‘cv::AccessFlag’ is deprecated [-Wdeprecated-enum-enum-conversion]
  203 | inline _OutputArray::_OutputArray(std::vector<Mat>& vec) { init(STD_VECTOR_MAT + ACCESS_WRITE, &vec); }
      |                                                                 ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~
/usr/include/opencv4/opencv2/core/mat.inl.hpp: In constructor ‘cv::_OutputArray::_OutputArray(cv::UMat&)’:
/usr/include/opencv4/opencv2/core/mat.inl.hpp:204:56: warning: arithmetic between different enumeration types ‘cv::_InputArray::KindFlag’ and ‘cv::AccessFlag’ is deprecated [-Wdeprecated-enum-enum-conversion]
  204 | inline _OutputArray::_OutputArray(UMat& m) { init(UMAT + ACCESS_WRITE, &m); }
      |                                                   ~~~~~^~~~~~~~~~~~~~
/usr/include/opencv4/opencv2/core/mat.inl.hpp: In constructor ‘cv::_OutputArray::_OutputArray(std::vector<cv::UMat>&)’:
/usr/include/opencv4/opencv2/core/mat.inl.hpp:205:82: warning: arithmetic between different enumeration types ‘cv::_InputArray::KindFlag’ and ‘cv::AccessFlag’ is deprecated [-Wdeprecated-enum-enum-conversion]
  205 | inline _OutputArray::_OutputArray(std::vector<UMat>& vec) { init(STD_VECTOR_UMAT + ACCESS_WRITE, &vec); }
      |                                                                  ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~
/usr/include/opencv4/opencv2/core/mat.inl.hpp: In constructor ‘cv::_OutputArray::_OutputArray(std::array<cv::Mat, _Nm>&)’:
/usr/include/opencv4/opencv2/core/mat.inl.hpp:217:22: warning: arithmetic between different enumeration types ‘cv::_InputArray::KindFlag’ and ‘cv::AccessFlag’ is deprecated [-Wdeprecated-enum-enum-conversion]
  217 | { init(STD_ARRAY_MAT + ACCESS_WRITE, arr.data(), Size(1, _Nm)); }
      |        ~~~~~~~~~~~~~~^~~~~~~~~~~~~~
/usr/include/opencv4/opencv2/core/mat.inl.hpp: In constructor ‘cv::_OutputArray::_OutputArray(cv::cuda::GpuMat&)’:
/usr/include/opencv4/opencv2/core/mat.inl.hpp:272:21: warning: arithmetic between different enumeration types ‘cv::_InputArray::KindFlag’ and ‘cv::AccessFlag’ is deprecated [-Wdeprecated-enum-enum-conversion]
  272 | { init(CUDA_GPU_MAT + ACCESS_WRITE, &d_mat); }
      |        ~~~~~~~~~~~~~^~~~~~~~~~~~~~
/usr/include/opencv4/opencv2/core/mat.inl.hpp: In constructor ‘cv::_OutputArray::_OutputArray(std::vector<cv::cuda::GpuMat>&)’:
/usr/include/opencv4/opencv2/core/mat.inl.hpp:275:38: warning: arithmetic between different enumeration types ‘cv::_InputArray::KindFlag’ and ‘cv::AccessFlag’ is deprecated [-Wdeprecated-enum-enum-conversion]
  275 | {       init(STD_VECTOR_CUDA_GPU_MAT + ACCESS_WRITE, &d_mat);}
      |              ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~
/usr/include/opencv4/opencv2/core/mat.inl.hpp: In constructor ‘cv::_OutputArray::_OutputArray(cv::ogl::Buffer&)’:
/usr/include/opencv4/opencv2/core/mat.inl.hpp:278:22: warning: arithmetic between different enumeration types ‘cv::_InputArray::KindFlag’ and ‘cv::AccessFlag’ is deprecated [-Wdeprecated-enum-enum-conversion]
  278 | { init(OPENGL_BUFFER + ACCESS_WRITE, &buf); }
      |        ~~~~~~~~~~~~~~^~~~~~~~~~~~~~
/usr/include/opencv4/opencv2/core/mat.inl.hpp: In constructor ‘cv::_OutputArray::_OutputArray(cv::cuda::HostMem&)’:
/usr/include/opencv4/opencv2/core/mat.inl.hpp:281:22: warning: arithmetic between different enumeration types ‘cv::_InputArray::KindFlag’ and ‘cv::AccessFlag’ is deprecated [-Wdeprecated-enum-enum-conversion]
  281 | { init(CUDA_HOST_MEM + ACCESS_WRITE, &cuda_mem); }
      |        ~~~~~~~~~~~~~~^~~~~~~~~~~~~~
/usr/include/opencv4/opencv2/core/mat.inl.hpp: In constructor ‘cv::_InputOutputArray::_InputOutputArray(cv::Mat&)’:
/usr/include/opencv4/opencv2/core/mat.inl.hpp:328:63: warning: arithmetic between different enumeration types ‘cv::_InputArray::KindFlag’ and ‘cv::AccessFlag’ is deprecated [-Wdeprecated-enum-enum-conversion]
  328 | inline _InputOutputArray::_InputOutputArray(Mat& m) { init(MAT+ACCESS_RW, &m); }
      |                                                            ~~~^~~~~~~~~~
/usr/include/opencv4/opencv2/core/mat.inl.hpp: In constructor ‘cv::_InputOutputArray::_InputOutputArray(std::vector<cv::Mat>&)’:
/usr/include/opencv4/opencv2/core/mat.inl.hpp:329:89: warning: arithmetic between different enumeration types ‘cv::_InputArray::KindFlag’ and ‘cv::AccessFlag’ is deprecated [-Wdeprecated-enum-enum-conversion]
  329 | inline _InputOutputArray::_InputOutputArray(std::vector<Mat>& vec) { init(STD_VECTOR_MAT+ACCESS_RW, &vec); }
      |                                                                           ~~~~~~~~~~~~~~^~~~~~~~~~
/usr/include/opencv4/opencv2/core/mat.inl.hpp: In constructor ‘cv::_InputOutputArray::_InputOutputArray(cv::UMat&)’:
/usr/include/opencv4/opencv2/core/mat.inl.hpp:330:65: warning: arithmetic between different enumeration types ‘cv::_InputArray::KindFlag’ and ‘cv::AccessFlag’ is deprecated [-Wdeprecated-enum-enum-conversion]
  330 | inline _InputOutputArray::_InputOutputArray(UMat& m) { init(UMAT+ACCESS_RW, &m); }
      |                                                             ~~~~^~~~~~~~~~
/usr/include/opencv4/opencv2/core/mat.inl.hpp: In constructor ‘cv::_InputOutputArray::_InputOutputArray(std::vector<cv::UMat>&)’:
/usr/include/opencv4/opencv2/core/mat.inl.hpp:331:91: warning: arithmetic between different enumeration types ‘cv::_InputArray::KindFlag’ and ‘cv::AccessFlag’ is deprecated [-Wdeprecated-enum-enum-conversion]
  331 | inline _InputOutputArray::_InputOutputArray(std::vector<UMat>& vec) { init(STD_VECTOR_UMAT+ACCESS_RW, &vec); }
      |                                                                            ~~~~~~~~~~~~~~~^~~~~~~~~~
/usr/include/opencv4/opencv2/core/mat.inl.hpp: In constructor ‘cv::_InputOutputArray::_InputOutputArray(std::array<cv::Mat, _Nm>&)’:
/usr/include/opencv4/opencv2/core/mat.inl.hpp:343:22: warning: arithmetic between different enumeration types ‘cv::_InputArray::KindFlag’ and ‘cv::AccessFlag’ is deprecated [-Wdeprecated-enum-enum-conversion]
  343 | { init(STD_ARRAY_MAT + ACCESS_RW, arr.data(), Size(1, _Nm)); }
      |        ~~~~~~~~~~~~~~^~~~~~~~~~~
/usr/include/opencv4/opencv2/core/mat.inl.hpp: In constructor ‘cv::_InputOutputArray::_InputOutputArray(cv::cuda::GpuMat&)’:
/usr/include/opencv4/opencv2/core/mat.inl.hpp:398:21: warning: arithmetic between different enumeration types ‘cv::_InputArray::KindFlag’ and ‘cv::AccessFlag’ is deprecated [-Wdeprecated-enum-enum-conversion]
  398 | { init(CUDA_GPU_MAT + ACCESS_RW, &d_mat); }
      |        ~~~~~~~~~~~~~^~~~~~~~~~~
/usr/include/opencv4/opencv2/core/mat.inl.hpp: In constructor ‘cv::_InputOutputArray::_InputOutputArray(cv::ogl::Buffer&)’:
/usr/include/opencv4/opencv2/core/mat.inl.hpp:401:22: warning: arithmetic between different enumeration types ‘cv::_InputArray::KindFlag’ and ‘cv::AccessFlag’ is deprecated [-Wdeprecated-enum-enum-conversion]
  401 | { init(OPENGL_BUFFER + ACCESS_RW, &buf); }
      |        ~~~~~~~~~~~~~~^~~~~~~~~~~
/usr/include/opencv4/opencv2/core/mat.inl.hpp: In constructor ‘cv::_InputOutputArray::_InputOutputArray(cv::cuda::HostMem&)’:
/usr/include/opencv4/opencv2/core/mat.inl.hpp:404:22: warning: arithmetic between different enumeration types ‘cv::_InputArray::KindFlag’ and ‘cv::AccessFlag’ is deprecated [-Wdeprecated-enum-enum-conversion]
  404 | { init(CUDA_HOST_MEM + ACCESS_RW, &cuda_mem); }
      |        ~~~~~~~~~~~~~~^~~~~~~~~~~

I was just trying to use the official package (libopencv-dev)

2

that doesn’t sound official. that is some linux distribution’s package, that someone maintains who’s (likely) more affiliated with the linux distribution than with opencv.

the issue:

4

Do you mean I’d better build from source myself? I think that might be too much work

5

what exactly did you do to get these warnings?