opencv3.4.0 安装过程中出现的问题

重新安装opencv3.4.0

参考安装博客：

opencv 安装版本测试：pkg-config --modversion opencv

https://blog.csdn.net/cocoaqin/article/details/78163171

卸载opencv的方式：进入opencv源码build目录

make uninstall

cd ..

sudo rm -r build

sudo rm -r /usr/local/include/opencv2 /usr/local/include/opencv /usr/include/opencv /usr/include/opencv2 /usr/local/share/opencv /usr/local/share/OpenCV /usr/share/opencv /usr/share/OpenCV /usr/local/bin/opencv* /usr/local/lib/libopencv*

安装过程中出现以下问题：

问题（１）

/usr/bin/ld: /usr/local/lib/libavformat.a(allformats.o): relocation R_X86_64_32 against `ff_a64_muxer' can not be used when making a shared object; recompile with -fPIC

/usr/local/lib/libavformat.a: error adding symbols: Bad value

collect2: error: ld returned 1 exit status

modules/videoio/CMakeFiles/opencv_videoio.dir/build.make:256: recipe for target 'lib/libopencv_videoio.so.3.4.0' failed

make[2]: *** [lib/libopencv_videoio.so.3.4.0] Error 1

CMakeFiles/Makefile2:7097: recipe for target 'modules/videoio/CMakeFiles/opencv_videoio.dir/all' failed

make[1]: *** [modules/videoio/CMakeFiles/opencv_videoio.dir/all] Error 2

Makefile:160: recipe for target 'all' failed

make: *** [all] Error 2

解决方式：网上大部分网友说是FFMPEG未安装好的原因，因此需要把依赖库按要求安装好，参考：

https://blog.csdn.net/jasonzzj/article/details/53587889

https://www.cnblogs.com/arkenstone/p/6490017.html

https://github.com/DeaDBeeF-Player/deadbeef/issues/1691

https://blog.csdn.net/zwlq1314521/article/details/44981547

问题（２）opencv3.4.0在编译ocl_test.hpp文件过程中INTER_LINEAR_EXATC找不到声明

解决方式：将该文件中用到INTER_LINEAR_EXATC的地方　换成５这个值，参考网址：

https://blog.csdn.net/insanegtp/article/details/78893088

问题（３）

CUDA cudnn这一块出现错误了‘’/sbin/ldconfig.real: /usr/local/cuda-8.0/targets/x86_64-linux/lib/libcudnn.so.4 不是符号连接‘’

解决办法：参考博客https://blog.csdn.net/langb2014/article/details/54376716

问题（４）

collect2: error: ld returned 1 exit status

modules/viz/CMakeFiles/opencv_test_viz.dir/build.make:236: recipe for target 'bin/opencv_test_viz' failed

make[2]: *** [bin/opencv_test_viz] Error 1

CMakeFiles/Makefile2:3306: recipe for target 'modules/viz/CMakeFiles/opencv_test_viz.dir/all' failed

make[1]: *** [modules/viz/CMakeFiles/opencv_test_viz.dir/all] Error 2

Makefile:160: recipe for target 'all' failed

make: *** [all] Error 2

解决方式：

sudo apt-get autoremove libtiff5-dev

sudo apt-get install libtiff5-dev

https://stackoverflow.com/questions/38729954/error-installing-opencv-on-ubuntu-16-04

问题（５）期间安装过opencv3.4.1 安装完成后无法编译darknet出现一些Ｃ　Ｃ++兼容性的问题,因此卸载了重新安装opencv3.4.0

https://github.com/opencv/opencv/issues/10963(讨论网址)