encounter issue when installing

[Zhe Wang]

https://github.com/open-mmlab/denseflow/blob/master/INSTALL.md
when I ran ./zzdenseflow.sh, I got

CMake Error at CMakeLists.txt:67 (install):
install TARGETS given no ARCHIVE DESTINATION for static library target
"zzdenseflow".

when I read CMakeFiles/CMakeError.log, I got

/usr/bin/cc -fPIC CMakeFiles/cmTC_b7f79.dir/CheckSymbolExists.c.o -o cmTC_b7f79
CMakeFiles/cmTC_b7f79.dir/CheckSymbolExists.c.o: In function main': CheckSymbolExists.c:(.text+0x1b): undefined reference to pthread_create'
collect2: error: ld returned 1 exit status
CMakeFiles/cmTC_b7f79.dir/build.make:86: recipe for target 'cmTC_b7f79' failed

[lizz]

did you export BOOST_ROOT=$ZZROOT before install denseflow?

[lizz]

Another try is to remove all anaconda related things in your PATH and LD_LIBRARY_PATH.

Conda is often a trouble when compiling & installing.

[Zhe Wang]

Thanks for answering!
After adding all the include path, lib path and bin path, I have the following compiling error.

libzzdenseflow.a(denseflow_gpu.cpp.o): In function DenseFlow::calc_optflows_imp(FlowBuffer const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int, bool, cv::cuda::Stream&)': denseflow_gpu.cpp:(.text+0x296b): undefined reference to cv::cuda::OpticalFlowDual_TVL1::create(double, double, double, int, int, double, int, double, double, bool)'
denseflow_gpu.cpp:(.text+0x2a08): undefined reference to cv::cuda::FarnebackOpticalFlow::create(int, double, bool, int, int, int, double, int)' denseflow_gpu.cpp:(.text+0x2a9f): undefined reference to cv::cuda::BroxOpticalFlow::create(double, double, double, int, int, int)'
collect2: error: ld returned 1 exit status

[lizz]

is the opencv compiled with cuda?

[Zhe Wang]

is the opencv compiled with cuda?

I mv anaconda3 to anaconda3_bk (also disable all anaconda in .bashrc) and check the python I am using is /usr/bin/python2.7,
then recompile everything following https://github.com/open-mmlab/denseflow/blob/master/INSTALL.md

[lizz]

Could you check if OpenCV is compiled with CUDA?

You may run zzopencv again, and look at its summary when it prints.

[Zhe Wang]

Reran zzopencv and getting following summary (only copy cuda related):

-- CUDA detected: 10.0
-- CUDA NVCC target flags: -gencode;arch=compute_30,code=sm_30;-gencode;arch=compute_35,code=sm_35;-gencode;arch=compute_37,code=sm_37;-gencode;arch=compute_50,code=sm_50;-gencode;arch=compute_52,code=sm_52;-gencode;arch=compute_60,code=sm_60;-gencode;arch=compute_61,code=sm_61;-gencode;arch=compute_70,code=sm_70;-gencode;arch=compute_75,code=sm_75;-D_FORCE_INLINES
-- LAPACK(OpenBLAS): LAPACK_LIBRARIES: /usr/local/lib/libopenblas.so
-- LAPACK(OpenBLAS): Support is enabled.

-- NVIDIA CUDA: YES (ver 10.0, CUFFT CUBLAS FAST_MATH)
-- NVIDIA GPU arch: 30 35 37 50 52 60 61 70 75
-- NVIDIA PTX archs:

-- cuDNN: YES (ver 7.5.1)

-- OpenCL: YES (no extra features)
-- Include path: /home/ubuntu/app/src/opencv/3rdparty/include/opencl/1.2
-- Link libraries: Dynamic load

-- Python (for build): /usr/bin/python

-- Install to: /home/ubuntu/app

[lizz]

Looks like opencv is okay. Could rm the denseflow dir in $ZZROOT/src/denseflow and rerun the installation? In the meantime, look at its output, and find which opencv it is using.

I guess it finds the wrong opencv (without cuda). Also, did you export OpenCV_DIR=$ZZROOT before installing denseflow?

[Zhe Wang]

Thanks for the kind answer! Below are keys to solve the problems.

1. add ARCHIVE DESTINATION lib, before LIBRARY DESTINATION lib in CMakelist.txt
2. clean everything (anaconda )before start installing. I delete all the app directory and reinstall everything follow https://github.com/open-mmlab/denseflow/blob/master/INSTALL.md
3. I export PATH, INCLUDE_PATH, LD_LIBRARY_PATH, CPLUS_INCLUDE_PATH, before installing Opencv.

[lizz]

Glad you solved it! If the CMakelist.txt or the install scripts could be improved, would you mind make a pr?