Ubuntu: installing opencv gives error unsported GCC version despite use of alternative



Question:

I'm trying to install opencv 3.1. I have downloaded opencv (https://github.com/Itseez/opencv_contrib/archive/3.1.0.zip) and unzipped it. Now according to various tutorials I should be able to compile it using

$cmake -D CMAKE_BUILD_TYPE=RELEASE     -D CMAKE_INSTALL_PREFIX=/usr/local     -D INSTALL_PYTHON_EXAMPLES=ON     -D INSTALL_C_EXAMPLES=OFF     -D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib-3.1.0/modules     -D PYTHON_EXECUTABLE=~/.virtualenvs/cv/bin/python     -D BUILD_EXAMPLES=ON ..  $make -j $(nproc)  

This quickly fails with the following output:

$ make -j $(nproc)  [  0%] Automatic moc for target opencv_test_highgui  [  0%] Automatic moc for target opencv_test_cvv  [  0%] Automatic moc for target opencv_cvv  [  0%] Automatic moc for target example_cvv_cvv_demo  [  0%] Automatic moc for target opencv_highgui  [  1%] Built target opencv_cudev  [  1%] Built target numeric  [  2%] Built target libjasper  [  2%] Building NVCC (Device) object modules/core/CMakeFiles/cuda_compile.dir/src/cuda/cuda_compile_generated_gpu_mat.cu.o  [  2%] Built target opencv_test_cvv_automoc  [  2%] Built target opencv_test_highgui_automoc  [  2%] Built target example_cvv_cvv_demo_automoc  [  2%] Built target opencv_cvv_automoc  [  2%] Built target opencv_highgui_automoc  nvcc warning : The 'compute_20', 'sm_20', and 'sm_21' architectures are deprecated, and may be removed in a future release (Use -Wno-deprecated-gpu-targets to suppress warning).  In file included from /usr/include/cuda_runtime.h:78:0,                   from <command-line>:0:  /usr/include/host_config.h:119:2: error: #error -- unsupported GNU version! gcc versions later than 5 are not supported!   #error -- unsupported GNU version! gcc versions later than 5 are not supported!    ^~~~~  [  3%] Built target multiview  [  3%] Built target correspondence    CMake Error at cuda_compile_generated_gpu_mat.cu.o.cmake:208 (message):    Error generating    /home/thijser/opencv-3.1.0/build/modules/core/CMakeFiles/cuda_compile.dir/src/cuda/./cuda_compile_generated_gpu_mat.cu.o      modules/core/CMakeFiles/opencv_core.dir/build.make:63: recipe for target 'modules/core/CMakeFiles/cuda_compile.dir/src/cuda/cuda_compile_generated_gpu_mat.cu.o' failed  make[2]: *** [modules/core/CMakeFiles/cuda_compile.dir/src/cuda/cuda_compile_generated_gpu_mat.cu.o] Error 1  CMakeFiles/Makefile2:2122: recipe for target 'modules/core/CMakeFiles/opencv_core.dir/all' failed  make[1]: *** [modules/core/CMakeFiles/opencv_core.dir/all] Error 2  Makefile:160: recipe for target 'all' failed  make: *** [all] Error 2  

So it says that I'm using the wrong version of gcc however I'm already using 4.9 via alternatives

$ sudo update-alternatives --config gcc  There are 3 choices for the alternative gcc (providing /usr/bin/gcc).      Selection    Path              Priority   Status  ------------------------------------------------------------    0            /usr/bin/gcc-6     60        auto mode  * 1            /usr/bin/gcc-4.9   20        manual mode    2            /usr/bin/gcc-5     25        manual mode    3            /usr/bin/gcc-6     60        manual mode  

Also here is the cmake output

$ cmake -D CMAKE_BUILD_TYPE=RELEASE     -D CMAKE_INSTALL_PREFIX=/usr/local     -D INSTALL_PYTHON_EXAMPLES=ON     -D INSTALL_C_EXAMPLES=OFF     -D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib-3.1.0/modules     -D PYTHON_EXECUTABLE=~/.virtualenvs/cv/bin/python     -D BUILD_EXAMPLES=ON ..  -- Detected version of GNU GCC: 49 (409)  -- Found ZLIB: /usr/lib/x86_64-linux-gnu/libz.so (found suitable version "1.2.11", minimum required is "1.2.3")   -- Could NOT find Jasper (missing:  JASPER_LIBRARIES JASPER_INCLUDE_DIR)   -- Found ZLIB: /usr/lib/x86_64-linux-gnu/libz.so (found version "1.2.11")   -- Found OpenEXR: /usr/lib/x86_64-linux-gnu/libIlmImf.so  -- Checking for module 'gstreamer-base-1.0'  --   No package 'gstreamer-base-1.0' found  -- Checking for module 'gstreamer-video-1.0'  --   No package 'gstreamer-video-1.0' found  -- Checking for module 'gstreamer-app-1.0'  --   No package 'gstreamer-app-1.0' found  -- Checking for module 'gstreamer-riff-1.0'  --   No package 'gstreamer-riff-1.0' found  -- Checking for module 'gstreamer-pbutils-1.0'  --   No package 'gstreamer-pbutils-1.0' found  -- Checking for module 'gstreamer-base-0.10'  --   No package 'gstreamer-base-0.10' found  -- Checking for module 'gstreamer-video-0.10'  --   No package 'gstreamer-video-0.10' found  -- Checking for module 'gstreamer-app-0.10'  --   No package 'gstreamer-app-0.10' found  -- Checking for module 'gstreamer-riff-0.10'  --   No package 'gstreamer-riff-0.10' found  -- Checking for module 'gstreamer-pbutils-0.10'  --   No package 'gstreamer-pbutils-0.10' found  -- Looking for linux/videodev.h  -- Looking for linux/videodev.h - not found  -- Looking for linux/videodev2.h  -- Looking for linux/videodev2.h - found  -- Looking for sys/videoio.h  -- Looking for sys/videoio.h - not found  -- Checking for module 'libavresample'  --   No package 'libavresample' found  -- Looking for libavformat/avformat.h  -- Looking for libavformat/avformat.h - found  -- Looking for ffmpeg/avformat.h  -- Looking for ffmpeg/avformat.h - not found  -- Checking for module 'libgphoto2'  --   No package 'libgphoto2' found  -- found IPP (ICV version): 9.0.1 [9.0.1]  -- at: /home/thijser/opencv-3.1.0/3rdparty/ippicv/unpack/ippicv_lnx  -- CUDA detected: 8.0  -- CUDA NVCC target flags: -gencode;arch=compute_20,code=sm_20;-gencode;arch=compute_20,code=sm_21;-gencode;arch=compute_30,code=sm_30;-gencode;arch=compute_35,code=sm_35;-gencode;arch=compute_30,code=compute_30  -- To enable PlantUML support, set PLANTUML_JAR environment variable or pass -DPLANTUML_JAR=<filepath> option to cmake  -- Found PythonInterp: /home/thijser/.virtualenvs/cv/bin/python (found suitable version "3.5.3", minimum required is "2.7")   Traceback (most recent call last):    File "<string>", line 1, in <module>  ImportError: No module named 'numpy'  -- Found PythonInterp: /home/thijser/.virtualenvs/cv/bin/python3 (found suitable version "3.5.3", minimum required is "3.4")   Traceback (most recent call last):    File "<string>", line 1, in <module>  ImportError: No module named 'numpy'  -- Found apache ant 1.9.8: /usr/bin/ant  -- Could NOT find Matlab (missing:  MATLAB_MEX_SCRIPT MATLAB_INCLUDE_DIRS MATLAB_ROOT_DIR MATLAB_LIBRARIES MATLAB_LIBRARY_DIRS MATLAB_MEXEXT MATLAB_ARCH MATLAB_BIN)   -- The imported target "vtkRenderingPythonTkWidgets" references the file     "/usr/lib/x86_64-linux-gnu/libvtkRenderingPythonTkWidgets.so"  but this file does not exist.  Possible reasons include:  * The file was deleted, renamed, or moved to another location.  * An install or uninstall procedure did not complete successfully.  * The installation package was faulty and contained     "/usr/lib/cmake/vtk-6.3/VTKTargets.cmake"  but not all the files it references.    -- The imported target "vtk" references the file     "/usr/bin/vtk"  but this file does not exist.  Possible reasons include:  * The file was deleted, renamed, or moved to another location.  * An install or uninstall procedure did not complete successfully.  * The installation package was faulty and contained     "/usr/lib/cmake/vtk-6.3/VTKTargets.cmake"  but not all the files it references.    -- Found VTK ver. 6.3.0 (usefile: /usr/lib/cmake/vtk-6.3/UseVTK.cmake)  -- Caffe:   NO  -- Protobuf:   YES  -- Glog:   YES  -- HDF5: Using hdf5 compiler wrapper to determine C configuration  -- HDF5:   YES  -- CERES support is disabled. Ceres Solver for reconstruction API is required.  -- Tesseract:   NO  -- HDF5: Using hdf5 compiler wrapper to determine C configuration  -- HDF5:   YES  -- The protocol buffer compiler and libprotobuf were found  -- Tesseract:   NO  -- CERES support is disabled. Ceres Solver for reconstruction API is required.  --   -- General configuration for OpenCV 3.1.0 =====================================  --   Version control:               unknown  --   --   Platform:  --     Host:                        Linux 4.10.0-26-generic x86_64  --     CMake:                       3.7.2  --     CMake generator:             Unix Makefiles  --     CMake build tool:            /usr/bin/make  --     Configuration:               RELEASE  --   --   C/C++:  --     Built as dynamic libs?:      YES  --     C++ Compiler:                /usr/bin/c++  (ver 6.3.0)  --     C++ flags (Release):         -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wno-narrowing -Wno-delete-non-virtual-dtor -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -mno-avx -msse3 -mno-ssse3 -mno-sse4.1 -mno-sse4.2 -ffunction-sections -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG  -DNDEBUG  --     C++ flags (Debug):           -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wno-narrowing -Wno-delete-non-virtual-dtor -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -mno-avx -msse3 -mno-ssse3 -mno-sse4.1 -mno-sse4.2 -ffunction-sections -fvisibility=hidden -fvisibility-inlines-hidden -g  -O0 -DDEBUG -D_DEBUG  --     C Compiler:                  /usr/bin/cc  --     C flags (Release):           -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wno-narrowing -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -mno-avx -msse3 -mno-ssse3 -mno-sse4.1 -mno-sse4.2 -ffunction-sections -fvisibility=hidden -O3 -DNDEBUG  -DNDEBUG  --     C flags (Debug):             -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wno-narrowing -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -mno-avx -msse3 -mno-ssse3 -mno-sse4.1 -mno-sse4.2 -ffunction-sections -fvisibility=hidden -g  -O0 -DDEBUG -D_DEBUG  --     Linker flags (Release):  --     Linker flags (Debug):  --     Precompiled headers:         NO  --     Extra dependencies:          Qt5::Test Qt5::Concurrent Qt5::OpenGL /usr/lib/x86_64-linux-gnu/libwebp.so /usr/lib/x86_64-linux-gnu/libImath.so /usr/lib/x86_64-linux-gnu/libIlmImf.so /usr/lib/x86_64-linux-gnu/libIex.so /usr/lib/x86_64-linux-gnu/libHalf.so /usr/lib/x86_64-linux-gnu/libIlmThread.so dc1394 xine v4l1 v4l2 avcodec avformat avutil swscale /usr/lib/x86_64-linux-gnu/libbz2.so Qt5::Core Qt5::Gui Qt5::Widgets /usr/lib/x86_64-linux-gnu/libprotobuf.so /usr/lib/x86_64-linux-gnu/hdf5/serial/libhdf5.so /usr/lib/x86_64-linux-gnu/libpthread.so /usr/lib/x86_64-linux-gnu/libsz.so /usr/lib/x86_64-linux-gnu/libdl.so /usr/lib/x86_64-linux-gnu/libm.so correspondence multiview numeric glog gflags vtkRenderingOpenGL vtkImagingHybrid vtkIOImage vtkCommonDataModel vtkCommonMath vtkCommonCore vtksys vtkCommonMisc vtkCommonSystem vtkCommonTransforms vtkCommonExecutionModel vtkDICOMParser vtkIOCore /usr/lib/x86_64-linux-gnu/libz.so vtkmetaio /usr/lib/x86_64-linux-gnu/libjpeg.so /usr/lib/x86_64-linux-gnu/libpng.so /usr/lib/x86_64-linux-gnu/libtiff.so vtkImagingCore vtkRenderingCore vtkCommonColor vtkFiltersExtraction vtkFiltersCore vtkFiltersGeneral vtkCommonComputationalGeometry vtkFiltersStatistics vtkImagingFourier vtkalglib vtkFiltersGeometry vtkFiltersSources vtkInteractionStyle vtkRenderingLOD vtkFiltersModeling vtkIOPLY vtkIOGeometry vtkFiltersTexture vtkRenderingFreeType /usr/lib/x86_64-linux-gnu/libfreetype.so vtkftgl vtkIOExport vtkRenderingAnnotation vtkImagingColor vtkRenderingContext2D vtkRenderingGL2PS vtkRenderingContextOpenGL /usr/lib/x86_64-linux-gnu/libgl2ps.so vtkRenderingLabel dl m pthread rt /usr/lib/x86_64-linux-gnu/libGLU.so /usr/lib/x86_64-linux-gnu/libGL.so tbb atomic cudart nppc nppi npps cufft -L/usr/lib/x86_64-linux-gnu  --     3rdparty dependencies:       libjasper  --   --   OpenCV modules:  --     To be built:                 cudev core cudaarithm flann hdf imgproc ml reg surface_matching video viz cudabgsegm cudafilters cudaimgproc cudawarping dnn fuzzy imgcodecs photo shape videoio cudacodec highgui objdetect plot ts xobjdetect xphoto bgsegm bioinspired dpm face features2d line_descriptor saliency text calib3d ccalib cudafeatures2d cudalegacy cudaobjdetect cudaoptflow cudastereo cvv datasets java rgbd stereo structured_light superres tracking videostab xfeatures2d ximgproc aruco optflow sfm stitching  --     Disabled:                    world contrib_world  --     Disabled by dependency:      -  --     Unavailable:                 python2 python3 matlab  --   --   GUI:   --     QT 5.x:                      YES (ver 5.7.1)  --     QT OpenGL support:           YES (Qt5::OpenGL 5.7.1)  --     OpenGL support:              YES (/usr/lib/x86_64-linux-gnu/libGLU.so /usr/lib/x86_64-linux-gnu/libGL.so)  --     VTK support:                 YES (ver 6.3.0)  --   --   Media I/O:   --     ZLib:                        /usr/lib/x86_64-linux-gnu/libz.so (ver 1.2.11)  --     JPEG:                        /usr/lib/x86_64-linux-gnu/libjpeg.so (ver )  --     WEBP:                        /usr/lib/x86_64-linux-gnu/libwebp.so (ver encoder: 0x0209)  --     PNG:                         /usr/lib/x86_64-linux-gnu/libpng.so (ver 1.6.28)  --     TIFF:                        /usr/lib/x86_64-linux-gnu/libtiff.so (ver 42 - 4.0.7)  --     JPEG 2000:                   build (ver 1.900.1)  --     OpenEXR:                     /usr/lib/x86_64-linux-gnu/libImath.so /usr/lib/x86_64-linux-gnu/libIlmImf.so /usr/lib/x86_64-linux-gnu/libIex.so /usr/lib/x86_64-linux-gnu/libHalf.so /usr/lib/x86_64-linux-gnu/libIlmThread.so (ver 2.2.0)  --     GDAL:                        NO  --   --   Video I/O:  --     DC1394 1.x:                  NO  --     DC1394 2.x:                  YES (ver 2.2.5)  --     FFMPEG:                      YES  --       codec:                     YES (ver 57.64.101)  --       format:                    YES (ver 57.56.101)  --       util:                      YES (ver 55.34.101)  --       swscale:                   YES (ver 4.2.100)  --       resample:                  NO  --       gentoo-style:              YES  --     GStreamer:                   NO  --     OpenNI:                      NO  --     OpenNI PrimeSensor Modules:  NO  --     OpenNI2:                     NO  --     PvAPI:                       NO  --     GigEVisionSDK:               NO  --     UniCap:                      NO  --     UniCap ucil:                 NO  --     V4L/V4L2:                    Using libv4l1 (ver 1.12.3) / libv4l2 (ver 1.12.3)  --     XIMEA:                       NO  --     Xine:                        YES (ver 1.2.6)  --     gPhoto2:                     NO  --   --   Parallel framework:            TBB (ver 4.4 interface 9005)  --   --   Other third-party libraries:  --     Use IPP:                     9.0.1 [9.0.1]  --          at:                     /home/thijser/opencv-3.1.0/3rdparty/ippicv/unpack/ippicv_lnx  --     Use IPP Async:               NO  --     Use VA:                      NO  --     Use Intel VA-API/OpenCL:     NO  --     Use Eigen:                   YES (ver 3.3.2)  --     Use Cuda:                    YES (ver 8.0)  --     Use OpenCL:                  YES  --     Use custom HAL:              NO  --   --   NVIDIA CUDA  --     Use CUFFT:                   YES  --     Use CUBLAS:                  NO  --     USE NVCUVID:                 NO  --     NVIDIA GPU arch:             20 21 30 35  --     NVIDIA PTX archs:            30  --     Use fast math:               NO  --   --   OpenCL:  --     Version:                     dynamic  --     Include path:                /home/thijser/opencv-3.1.0/3rdparty/include/opencl/1.2  --     Use AMDFFT:                  NO  --     Use AMDBLAS:                 NO  --   --   Python 2:  --     Interpreter:                 /home/thijser/.virtualenvs/cv/bin/python (ver 3.5.3)  --   --   Python 3:  --     Interpreter:                 /home/thijser/.virtualenvs/cv/bin/python3 (ver 3.5.3)  --   --   Python (for build):            /home/thijser/.virtualenvs/cv/bin/python  --   --   Java:  --     ant:                         /usr/bin/ant (ver 1.9.8)  --     JNI:                         /usr/lib/jvm/java-8-openjdk-amd64/include /usr/lib/jvm/java-8-openjdk-amd64/include/linux /usr/lib/jvm/java-8-openjdk-amd64/include  --     Java wrappers:               YES  --     Java tests:                  YES  --   --   Matlab:                        Matlab not found or implicitly disabled  --   --   Documentation:  --     Doxygen:                     /usr/bin/doxygen (ver 1.8.13)  --     PlantUML:                    NO  --   --   Tests and samples:  --     Tests:                       YES  --     Performance tests:           YES  --     C/C++ Examples:              YES  --   --   Install path:                  /usr/local  --   --   cvconfig.h is in:              /home/thijser/opencv-3.1.0/build  -- -----------------------------------------------------------------  --   -- Configuring done  -- Generating done  -- Build files have been written to: /home/thijser/opencv-3.1.0/build  

Anyone know how to fix this?

edit output of

$ ls -l /usr/lib/nvidia-cuda-toolkit/bin  total 20900  -rwxr-xr-x 1 root root  9913472 sep 14  2016 cicc  drwxr-xr-x 2 root root     4096 mrt 27 14:19 crt  -rwxr-xr-x 1 root root      711 jan 20 20:25 g++  -rwxr-xr-x 1 root root      711 jan 20 19:48 gcc  lrwxrwxrwx 1 root root       40 jan 20 20:25 libcuinj64.so -> ../../x86_64-linux-gnu/libcuinj64.so.8.0  -rwxr-xr-x 1 root root   245680 sep 14  2016 nvcc  lrwxrwxrwx 1 root root       17 jan 20 20:25 nvcc.profile -> /etc/nvcc.profile  -rwxr-xr-x 1 root root 11226584 sep 14  2016 nvprof  

Where gcc contains the following:

$ cat /usr/lib/nvidia-cuda-toolkit/bin/gcc  #!/bin/sh    # Check for g++ to avoid using different versions of gcc and g++ on systems  # with both g++-4.X and gcc-4.Y but not g++-4.Y installed.    prog=false  if g++-5 --version >/dev/null 2>&1; then      prog=gcc-5  elif g++-4.9 --version >/dev/null 2>&1; then      prog=gcc-4.9  elif g++-4.8 --version >/dev/null 2>&1; then      prog=gcc-4.8  elif clang-3.8 --version >/dev/null 2>&1; then      echo "ERROR: No supported gcc/g++ host compiler found, but clang-3.8 is available." >&2      echo "       Use 'nvcc -ccbin clang-3.8' to use that instead." >&2      exit 1  else      echo "ERROR: No supported gcc/g++ host compiler found." >&2      echo "       Use 'nvcc -ccbin <compiler>' to specify a host compiler." >&2      exit 1  fi    exec $prog "$@"  

and g++ contains

$ cat /usr/lib/nvidia-cuda-toolkit/bin/g++  #!/bin/sh    # Check for g++ to avoid using different versions of gcc and g++ on systems  # with both g++-4.X and gcc-4.Y but not g++-4.Y installed.    prog=false  if g++-5 --version >/dev/null 2>&1; then      prog=g++-5  elif g++-4.9 --version >/dev/null 2>&1; then      prog=g++-4.9  elif g++-4.8 --version >/dev/null 2>&1; then      prog=g++-4.8  elif clang-3.8 --version >/dev/null 2>&1; then      echo "ERROR: No supported gcc/g++ host compiler found, but clang-3.8 is available." >&2      echo "       Use 'nvcc -ccbin clang-3.8' to use that instead." >&2      exit 1  else      echo "ERROR: No supported gcc/g++ host compiler found." >&2      echo "       Use 'nvcc -ccbin <compiler>' to specify a host compiler." >&2      exit 1  fi    exec $prog "$@"  

edit edit: adding the -D CUDA_NVCC_FLAGS="-ccbin gcc-4.9" flag resulted in

compilation until 32% as which point it fails because   [ 32%] Linking CXX executable ../../bin/opencv_test_dnn  ../../lib/libopencv_dnn.so.3.1.0: undefined reference to `google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(int, std::string const&, google::protobuf::io::CodedOutputStream*)'  ../../lib/libopencv_dnn.so.3.1.0: undefined reference to `google::protobuf::io::CodedOutputStream::WriteStringWithSizeToArray(std::string const&, unsigned char*)'  ../../lib/libopencv_dnn.so.3.1.0: undefined reference to `google::protobuf::Message::GetTypeName() const'  ../../lib/libopencv_dnn.so.3.1.0: undefined reference to `google::protobuf::MessageFactory::InternalRegisterGeneratedFile(char const*, void (*)(std::string const&))'  ../../lib/libopencv_dnn.so.3.1.0: undefined reference to `google::protobuf::internal::WireFormatLite::WriteBytesMaybeAliased(int, std::string const&, google::protobuf::io::CodedOutputStream*)'  ../../lib/libopencv_dnn.so.3.1.0: undefined reference to `google::protobuf::internal::empty_string_'  ../../lib/libopencv_dnn.so.3.1.0: undefined reference to `google::protobuf::internal::WireFormatLite::WriteString(int, std::string const&, google::protobuf::io::CodedOutputStream*)'  ../../lib/libopencv_dnn.so.3.1.0: undefined reference to `google::protobuf::DescriptorPool::FindFileByName(std::string const&) const'  ../../lib/libopencv_dnn.so.3.1.0: undefined reference to `google::protobuf::internal::ArenaStringPtr::AssignWithDefault(std::string const*, google::protobuf::internal::ArenaStringPtr)'  ../../lib/libopencv_dnn.so.3.1.0: undefined reference to `google::protobuf::internal::WireFormatLite::ReadBytes(google::protobuf::io::CodedInputStream*, std::string*)'  ../../lib/libopencv_dnn.so.3.1.0: undefined reference to `google::protobuf::Message::InitializationErrorString() const'  collect2: error: ld returned 1 exit status  modules/dnn/CMakeFiles/opencv_test_dnn.dir/build.make:259: recipe for target 'bin/opencv_test_dnn' failed  make[2]: *** [bin/opencv_test_dnn] Error 1  CMakeFiles/Makefile2:7156: recipe for target 'modules/dnn/CMakeFiles/opencv_test_dnn.dir/all' failed  make[1]: *** [modules/dnn/CMakeFiles/opencv_test_dnn.dir/all] Error 2  [ 32%] Linking CXX executable ../../bin/opencv_perf_video  [ 32%] Built target opencv_perf_video  [ 32%] Linking CXX shared library ../../lib/libopencv_cudaarithm.so  [ 32%] Built target opencv_cudaarithm  [ 32%] Linking CXX shared library ../../lib/libopencv_cudawarping.so  [ 32%] Built target opencv_cudawarping  Makefile:160: recipe for target 'all' failed  make: *** [all] Error 2  

elsewhere it is suggested that this problem can occur if opencv 4.9 is used to install this but that would break cuda again. (and make clean or rm build -r didn't solve t he issue either)


Note:If u also have question or solution just comment us below or mail us on toontricks1994@gmail.com
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