[GitHub] [incubator-mxnet] rajkinra23 commented on issue #13288: OpenCV 4.0 Compatibility

[GitBox <gi...@apache.org>]

rajkinra23 commented on issue #13288:
URL: https://github.com/apache/incubator-mxnet/issues/13288#issuecomment-628874551


   > I still have linking errors in creating `bin/im2rec` with OpenCV 4.0.1 (MXNet HEAD: [09ba8be](https://github.com/apache/incubator-mxnet/commit/09ba8be4be36135e2a8d6c439313f5eed729d4bc)), mostly from not able to find `cv::String::allocate`, `cv::String::deallocate`, and `cv::error`. OpenCV 4 has moved to `std::string` so there are no methods of `allocate` or `deallocate`.
   > 
   > ```
   > (cd cpp-package/scripts; python OpWrapperGenerator.py mxnet/lib/libmxnet.so)
   > g++ -o bin/im2rec ... -L/usr/local/lib -lopencv_imgcodecs -lopencv_highgui -lopencv_imgproc -lopencv_core
   > Traceback (most recent call last):
   >   File "OpWrapperGenerator.py", line 432, in <module>
   >     raise(e)
   >   File "OpWrapperGenerator.py", line 426, in <module>
   >     f.write(patternStr % ParseAllOps())
   >   File "OpWrapperGenerator.py", line 320, in ParseAllOps
   >     cdll.libmxnet = cdll.LoadLibrary(sys.argv[1])
   >   File "~/anaconda3/lib/python3.6/ctypes/__init__.py", line 426, in LoadLibrary
   >     return self._dlltype(name)
   >   File "~/anaconda3/lib/python3.6/ctypes/__init__.py", line 348, in __init__
   >     self._handle = _dlopen(self._name, mode)
   > OSError: mxnet/lib/libmxnet.so: undefined symbol: _ZN2cv6String8allocateEm
   > cpp-package/cpp-package.mk:39: recipe for target 'cpp-package/include/mxnet-cpp/op.h' failed
   > make: *** [cpp-package/include/mxnet-cpp/op.h] Error 1
   > ...
   > ```
   > 
   > The OpenCV 4 libraries have been installed to `/usr/local/lib`.
   
   +1, im having the exact same problem here.


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