【Ubuntu版】源码安装opencv （FAQ）_cuda_nppist_library (advanced)

一、参考资料

【Ubuntu版】源码安装opencv（一）

二、FAQ

linux ubuntu16.04 opencv3.4.2 cuda9 安装编译填坑记

Q：cuda编译opencv错误

CMake Error: Variables are set to NOTFOUND
OpenCV3.3+CUDA9.0+Cmake3.9 环境搭建

CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
CUDA_nppi_LIBRARY (ADVANCED)
    linked by target "opencv_cudev" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudev
    linked by target "opencv_cudev" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudev
    linked by target "opencv_test_cudev" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudev/test
    linked by target "opencv_core" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/core
    linked by target "opencv_core" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/core
    linked by target "opencv_test_core" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/core
    linked by target "opencv_perf_core" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/core
    linked by target "opencv_test_cudaarithm" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudaarithm
    linked by target "opencv_perf_cudaarithm" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudaarithm
    linked by target "opencv_cudaarithm" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudaarithm
    linked by target "opencv_cudaarithm" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudaarithm
    linked by target "opencv_test_flann" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/flann
    linked by target "opencv_flann" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/flann
    linked by target "opencv_flann" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/flann
    linked by target "opencv_imgproc" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/imgproc
    linked by target "opencv_imgproc" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/imgproc
    linked by target "opencv_test_imgproc" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/imgproc
    linked by target "opencv_perf_imgproc" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/imgproc
    linked by target "opencv_test_ml" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/ml
    linked by target "opencv_ml" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/ml
    linked by target "opencv_ml" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/ml
    linked by target "opencv_test_objdetect" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/objdetect
    linked by target "opencv_objdetect" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/objdetect
    linked by target "opencv_objdetect" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/objdetect
    linked by target "opencv_perf_objdetect" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/objdetect
    linked by target "opencv_video" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/video
    linked by target "opencv_video" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/video
    linked by target "opencv_test_video" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/video
    linked by target "opencv_perf_video" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/video
    linked by target "opencv_test_cudabgsegm" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudabgsegm
    linked by target "opencv_cudabgsegm" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudabgsegm
    linked by target "opencv_cudabgsegm" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudabgsegm
    linked by target "opencv_perf_cudabgsegm" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudabgsegm
    linked by target "opencv_test_cudafilters" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudafilters
    linked by target "opencv_cudafilters" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudafilters
    linked by target "opencv_cudafilters" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudafilters
    linked by target "opencv_perf_cudafilters" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudafilters
    linked by target "opencv_test_cudaimgproc" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudaimgproc
    linked by target "opencv_perf_cudaimgproc" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudaimgproc
    linked by target "opencv_cudaimgproc" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudaimgproc
    linked by target "opencv_cudaimgproc" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudaimgproc
    linked by target "opencv_test_cudawarping" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudawarping
    linked by target "opencv_cudawarping" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudawarping
    linked by target "opencv_cudawarping" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudawarping
    linked by target "opencv_perf_cudawarping" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudawarping
    linked by target "opencv_test_dnn" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/dnn
    linked by target "opencv_dnn" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/dnn
    linked by target "opencv_dnn" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/dnn
    linked by target "opencv_perf_dnn" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/dnn
    linked by target "opencv_test_imgcodecs" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/imgcodecs
    linked by target "opencv_imgcodecs" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/imgcodecs
    linked by target "opencv_imgcodecs" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/imgcodecs
    linked by target "opencv_perf_imgcodecs" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/imgcodecs
    linked by target "opencv_test_photo" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/photo
    linked by target "opencv_photo" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/photo
    linked by target "opencv_photo" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/photo
    linked by target "opencv_perf_photo" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/photo
    linked by target "opencv_test_shape" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/shape
    linked by target "opencv_shape" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/shape
    linked by target "opencv_shape" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/shape
    linked by target "opencv_test_videoio" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/videoio
    linked by target "opencv_videoio" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/videoio
    linked by target "opencv_videoio" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/videoio
    linked by target "opencv_perf_videoio" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/videoio
    linked by target "opencv_test_cudacodec" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudacodec
    linked by target "opencv_cudacodec" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudacodec
    linked by target "opencv_cudacodec" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudacodec
    linked by target "opencv_perf_cudacodec" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudacodec
    linked by target "opencv_test_highgui" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/highgui
    linked by target "opencv_highgui" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/highgui
    linked by target "opencv_highgui" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/highgui
    linked by target "opencv_ts" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/ts
    linked by target "opencv_ts" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/ts
    linked by target "opencv_test_features2d" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/features2d
    linked by target "opencv_features2d" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/features2d
    linked by target "opencv_features2d" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/features2d
    linked by target "opencv_perf_features2d" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/features2d
    linked by target "opencv_test_calib3d" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/calib3d
    linked by target "opencv_calib3d" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/calib3d
    linked by target "opencv_calib3d" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/calib3d
    linked by target "opencv_perf_calib3d" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/calib3d
    linked by target "opencv_test_cudafeatures2d" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudafeatures2d
    linked by target "opencv_perf_cudafeatures2d" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudafeatures2d
    linked by target "opencv_cudafeatures2d" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudafeatures2d
    linked by target "opencv_cudafeatures2d" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudafeatures2d
    linked by target "opencv_test_cudalegacy" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudalegacy
    linked by target "opencv_cudalegacy" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudalegacy
    linked by target "opencv_cudalegacy" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudalegacy
    linked by target "opencv_perf_cudalegacy" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudalegacy
    linked by target "opencv_test_cudaobjdetect" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudaobjdetect
    linked by target "opencv_cudaobjdetect" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudaobjdetect
    linked by target "opencv_cudaobjdetect" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudaobjdetect
    linked by target "opencv_perf_cudaobjdetect" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudaobjdetect
    linked by target "opencv_test_cudaoptflow" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudaoptflow
    linked by target "opencv_cudaoptflow" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudaoptflow
    linked by target "opencv_cudaoptflow" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudaoptflow
    linked by target "opencv_perf_cudaoptflow" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudaoptflow
    linked by target "opencv_test_cudastereo" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudastereo
    linked by target "opencv_perf_cudastereo" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudastereo
    linked by target "opencv_cudastereo" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudastereo
    linked by target "opencv_cudastereo" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/cudastereo
    linked by target "opencv_test_stitching" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/stitching
    linked by target "opencv_perf_stitching" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/stitching
    linked by target "opencv_stitching" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/stitching
    linked by target "opencv_stitching" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/stitching
    linked by target "opencv_superres" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/superres
    linked by target "opencv_superres" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/superres
    linked by target "opencv_test_superres" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/superres
    linked by target "opencv_perf_superres" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/superres
    linked by target "opencv_test_videostab" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/videostab
    linked by target "opencv_videostab" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/videostab
    linked by target "opencv_videostab" in directory /home/yichao/360Downloads/opencv-4.1.0/modules/videostab
    linked by target "opencv_traincascade" in directory /home/yichao/360Downloads/opencv-4.1.0/apps/traincascade
    linked by target "opencv_createsamples" in directory /home/yichao/360Downloads/opencv-4.1.0/apps/createsamples
    linked by target "opencv_annotation" in directory /home/yichao/360Downloads/opencv-4.1.0/apps/annotation
    linked by target "opencv_visualisation" in directory /home/yichao/360Downloads/opencv-4.1.0/apps/visualisation
    linked by target "opencv_interactive-calibration" in directory /home/yichao/360Downloads/opencv-4.1.0/apps/interactive-calibration
    linked by target "opencv_version" in directory /home/yichao/360Downloads/opencv-4.1.0/apps/version

Generating done
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# 解决方法：
1. 修改 FindCUDA.cmake 文件
sudo gedit /home/yichao/360Downloads/opencv-4.1.0/cmake/FindCUDA.cmake

find_cuda_helper_libs(nppi)
修改为
find_cuda_helper_libs(nppial)
find_cuda_helper_libs(nppicc)
find_cuda_helper_libs(nppicom)
find_cuda_helper_libs(nppidei)
find_cuda_helper_libs(nppif)
find_cuda_helper_libs(nppig)
find_cuda_helper_libs(nppim)
find_cuda_helper_libs(nppist)
find_cuda_helper_libs(nppisu)
find_cuda_helper_libs(nppitc)

set(CUDA_npp_LIBRARY "${CUDA_nppc_LIBRARY};${CUDA_nppi_LIBRARY};${CUDA_npps_LIBRARY}")
修改为
set(CUDA_npp_LIBRARY "${CUDA_nppc_LIBRARY};${CUDA_nppial_LIBRARY};${CUDA_nppicc_LIBRARY};${CUDA_nppicom_LIBRARY};${CUDA_nppidei_LIBRARY};${CUDA_nppif_LIBRARY};${CUDA_nppig_LIBRARY};${CUDA_nppim_LIBRARY};${CUDA_nppist_LIBRARY};${CUDA_nppisu_LIBRARY};${CUDA_nppitc_LIBRARY};${CUDA_npps_LIBRARY}")

unset(CUDA_nppi_LIBRARY CACHE)
修改为
unset(CUDA_nppial_LIBRARY CACHE)
unset(CUDA_nppicc_LIBRARY CACHE)
unset(CUDA_nppicom_LIBRARY CACHE)
unset(CUDA_nppidei_LIBRARY CACHE)
unset(CUDA_nppif_LIBRARY CACHE)
unset(CUDA_nppig_LIBRARY CACHE)
unset(CUDA_nppim_LIBRARY CACHE)
unset(CUDA_nppist_LIBRARY CACHE)
unset(CUDA_nppisu_LIBRARY CACHE)
unset(CUDA_nppitc_LIBRARY CACHE)

2. 修改 OpenCVDetectCUDA.cmake 文件
sudo gedit /home/yichao/360Downloads/opencv-4.1.0/cmake/OpenCVDetectCUDA.cmake

 ...
  set(__cuda_arch_ptx "")
  if(CUDA_GENERATION STREQUAL "Fermi")
    set(__cuda_arch_bin "2.0")
  elseif(CUDA_GENERATION STREQUAL "Kepler")
    set(__cuda_arch_bin "3.0 3.5 3.7")
  ...
  修改为
    ...
  set(__cuda_arch_ptx "")
  if(CUDA_GENERATION STREQUAL "Kepler")
    set(__cuda_arch_bin "3.0 3.5 3.7")
  elseif(CUDA_GENERATION STREQUAL "Maxwell")
    set(__cuda_arch_bin "5.0 5.2")
  ...

set(__cuda_arch_bin "2.0 3.0 3.5 3.7 5.0 5.2 6.0 6.1")
替换为
set(__cuda_arch_bin "3.0 3.5 3.7 5.0 5.2 6.0 6.1")
  
  3. 修改 common.hpp 文件
  # cuda9以上版本中有一个单独的halffloat(cuda_fp16.h)头文件,也应该被包括在opencv的目录里
 sudo gedit /home/yichao/360Downloads/opencv-4.1.0/modules/cudev/include/opencv2/cudev/common.hpp
 
 添加一行
 #include <cuda_fp16.h>
 
 4. 重新 Configure
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Q：opencv2/features2d.hpp: 没有那个文件或目录

opencv2/features2d.hpp: 没有那个文件或目录
 #include "opencv2/features2d.hpp"
          ^~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
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In file included from /home/yichao/360Downloads/opencv-4.1.0/modules/stitching/include/opencv2/stitching.hpp:49:0,
                 from /home/yichao/360Downloads/opencv-4.1.0/modules/stitching/src/precomp.hpp:59,
                 from /home/yichao/360Downloads/opencv-4.1.0/opencv_build_dir/modules/stitching/opencv_stitching_pch_dephelp.cxx:1:
/home/yichao/360Downloads/opencv-4.1.0/modules/stitching/include/opencv2/stitching/detail/matchers.hpp:52:42: fatal error: opencv2/xfeatures2d/cuda.hpp: 没有那个文件或目录
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方法一（推荐）

在Ubuntu18.04中安装基于Python的OpenCV 3出现的问题总结
make error with opencv-3.4.0: fatal error: opencv2/xfeatures2d/cuda.hpp: No such file or directory #1534

# 解决办法
修改文件
/home/yichao/360Downloads/opencv-3.3.0/modules/stitching/CMakeLists.txt

在CMakeLists.txt增加以下内容：
INCLUDE_DIRECTORIES("/home/yichao/360Downloads/opencv-3.3.0/opencv_contrib-3.3.0/modules/xfeatures2d/include")
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方法二

# 解决办法
1. 搜索 cuda.hpp 文件在哪个文件夹
/usr/local/opencv4.1.0/include/opencv2/xfeatures2d/cuda.hpp

2. 新建 xfeatures2d 文件夹
mkdir /usr/include/opencv2/xfeatures2d/cuda.hpp

3. 创建软链接
sudo ln -s /usr/local/opencv4.1.0/include/opencv2/xfeatures2d/cuda.hpp /usr/include/opencv2/xfeatures2d/cuda.hpp
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如果缺少的文件太多了，可能是编译opencv路径错误，尝试用终极方法：

# 创建软链接
sudo ln -s /usr/local/opencv4.1.0/include/opencv2 /usr/include/opencv2
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Q：Ubuntu16.04 编译 opencv 出现错误：Unsupported gpu architecture ‘compute_20’

# 错误原因：
编译与GPU/CUDA有关

# 解决办法：
cmake编译的时候，最后指定使用Kepler

cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D CUDA_GENERATION=Kepler ..
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Q：权限问题

-- Configuring incomplete, errors occurred!
CMake Error: Cannot open file for write: /home/yichao/360Downloads/opencv-4.1.0/opencv_build_dir/CMakeCache.txt.tmp
CMake Error: : System Error: Permission denied
CMake Error: Unable to open cache file for save. /home/yichao/360Downloads/opencv-4.1.0/opencv_build_dir/CMakeCache.txt
CMake Error: : System Error: Permission denied
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# 错误原因：
在新建 opencv_build_dir 目录的时候，我执行的指令是：
sudo mkdir opencv_build_dir
opencv_build_dir 文件夹属于 root 用户组，文件夹被锁住

# 解决办法：
1. 删除 opencv_build_dir 目录
sudo rm -rf opencv_build_dir

2. 新建 opencv_build_dir 目录
mkdir opencv_build_dir

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Q：缺少opencv_contrib文件

CMake Error at cmake/OpenCVModule.cmake:305 (message):
  No extra modules found in folder:
  /home/yichao/360Downloads/opencv-4.1.0/opencv_contrib/modules

  Please provide path to 'opencv_contrib/modules' folder.
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# 解决办法：
1. 下载 opencv_contrib
下载地址：https://github.com/opencv/opencv_contrib/releases

2. 将 opencv_contrib 文件解压后放入opencv解压后的文件夹
/home/yichao/360Downloads/opencv-4.1.0/opencv_contrib-4.1.0

3. 重新 cmake
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Q：cmake错误

nvcc fatal   : A single input file is required for a non-link phase when an outputfile is specified
CMake Error at cuda_compile_generated_gpu_mat.cu.o.cmake:206 (message):
  Error generating
  /home/yichao/360Downloads/opencv-4.1.0/opencv_build_dir/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/Makefile2:2288: recipe for target 'modules/core/CMakeFiles/opencv_core.dir/all' failed
make[1]: *** [modules/core/CMakeFiles/opencv_core.dir/all] Error 2
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# 解决办法：
1. 修改 OpenCVDetectCUDA.cmake 文件
sudo gedit /home/yichao/360Downloads/opencv-4.1.0/cmake/OpenCVDetectCUDA.cmake

set(NVCC_FLAGS_EXTRA ${NVCC_FLAGS_EXTRA} -gencode arch=compute_${CMAKE_MATCH_2},code=sm_${CMAKE_MATCH_1})
替换为
set(NVCC_FLAGS_EXTRA ${NVCC_FLAGS_EXTRA} -D_FORCE_INLINES -gencode arch=compute_${CMAKE_MATCH_2},code=sm_${CMAKE_MATCH_1})

如果上面的方法无效，考虑用cmake-gui图形化界面编译opencv，修改config配置也比较方便
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Q：ocv_download的问题

face_landmark_model.dat 下载地址

其他类似(ocv_download)的问题，找到(ocv_download)前面的文本，继续如此替换即可！

CMake Error at /home/ubuntu/opencv3.1.0/opencv-3.1.0/cmake/OpenCVUtils.cmake:895 (file):
  file DOWNLOAD cannot open file for write.
Call Stack (most recent call first):
  /home/ubuntu/opencv3.1.0/opencv_contrib/modules/dnn_modern/CMakeLists.txt:20 (ocv_download)
 
 
CMake Error at /home/ubuntu/opencv3.1.0/opencv-3.1.0/cmake/OpenCVUtils.cmake:899 (message):
  Failed to download .  Status=
Call Stack (most recent call first):
  /home/ubuntu/opencv3.1.0/opencv_contrib/modules/dnn_modern/CMakeLists.txt:20 (ocv_download)
 
 
-- Configuring incomplete, errors occurred!
See also "/home/ubuntu/opencv3.1.0/opencv-3.1.0/build/CMakeFiles/CMakeOutput.log".
See also "/home/ubuntu/opencv3.1.0/opencv-3.1.0/build/CMakeFiles/CMakeError.log".
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# 解决办法：
找到(ocv_download)前面的txt，把报错的行数：
/home/ubuntu/opencv3.1.0/opencv_contrib/modules/dnn_modern/CMakeLists.txt:20

FILENAME替换为PACKAGE，继续Generate。
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Q：软链接错误

make[2]: *** No rule to make target `/usr/lib/libnvcuvid.so‘, needed by `lib/libopencv_cudacodec.so.3.1.0‘. Stop.
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# 解决办法：
重新建立软连接。
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Q：类似 libavformat.a 的错误

[ 34%] Linking CXX shared library ../../lib/libopencv_videoio.so
/usr/bin/ld: /usr/local/lib/libavformat.a(allformats.o): relocation R_X86_64_32 against `.bss' 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:386: recipe for target 'lib/libopencv_videoio.so.3.4.2' failed
make[2]: *** [lib/libopencv_videoio.so.3.4.2] Error 1
CMakeFiles/Makefile2:11230: recipe for target 'modules/videoio/CMakeFiles/opencv_videoio.dir/all' failed
make[1]: *** [modules/videoio/CMakeFiles/opencv_videoio.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
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# 解决办法：
不管是libavformat.a还是 libavcodec.a 、libavutil.a或libswscale.a引起的报错，都可以先把这几个文件从/usr/local/lib中移动别处先放着，等到编译完成了再放回去。 
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Q：BUILD_EXAMPLES错误

[ 88%] Linking CXX executable ../../bin/example_gpu_multi
/usr/bin/ld: CMakeFiles/example_gpu_multi.dir/multi.cpp.o: undefined reference to symbol '_ZN3tbb18task_group_contextD1Ev'
//usr/lib/x86_64-linux-gnu/libtbb.so.2: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
samples/gpu/CMakeFiles/example_gpu_multi.dir/build.make:122: recipe for target 'bin/example_gpu_multi' failed
make[2]: *** [bin/example_gpu_multi] Error 1
CMakeFiles/Makefile2:47768: recipe for target 'samples/gpu/CMakeFiles/example_gpu_multi.dir/all' failed
make[1]: *** [samples/gpu/CMakeFiles/example_gpu_multi.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
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# 解决办法：
BUILD_EXAMPLES=ON，请改成=OFF
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Q：Unsupported gpu architecture ‘compute_20’

# 错误原因：
缺省和默认的架构是Fermi，不支持当前CUDA版本

# 解决办法：
指定CUDA架构和算力
-D CUDA_GENERATION=Pascal
-D CUDA_ARCH_BIN="7.5"
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Q：缺少环境变量

error while loading shared libraries: libopencv_core.so.3.0: cannot open shared object file: No such file or directory.
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# 解决办法：
添加环境变量

sudo gedit ~/.bashrc
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib

source ~/.bashrc
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Q：libEGL.so.1 不是符号连接

sudo gedit /etc/ld.so.conf.d/opencv.conf
sudo ldconfig
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sbin/ldconfig.real: /usr/lib/nvidia-375/libEGL.so.1 不是符号连接 
/sbin/ldconfig.real: /usr/lib32/nvidia-375/libEGL.so.1 不是符号连接 
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# 错误原因：
这个错误可能是由于系统BUG所致

# 解决办法：
删除软链接，重新创建软链接

sudo mv /usr/lib/nvidia-375/libEGL.so.1 /usr/lib/nvidia-375/libEGL.so.1.org 
sudo mv /usr/lib32/nvidia-375/libEGL.so.1 /usr/lib32/nvidia-375/libEGL.so.1.org 
sudo ln -s /usr/lib/nvidia-375/libEGL.so.375.39 /usr/lib/nvidia-375/libEGL.so.1 
sudo ln -s /usr/lib32/nvidia-375/libEGL.so.375.39 /usr/lib32/nvidia-375/libEGL.so.1
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Q：libcudnn.so.7 不是符号连接

Ubuntu ldconfig(解决*.so不是符号连接)
为什么得到“ /sbin/ldconfig.real：/usr/local/cuda/lib64/libcudnn.so.7不是符号链接”？

sudo gedit /etc/ld.so.conf.d/opencv.conf
sudo ldconfig
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/sbin/ldconfig.real: /usr/local/cuda-10.2/targets/x86_64-linux/lib/libcudnn.so.7 不是符号连接
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# 解决办法：
cd /usr/local/cuda-10.2/targets/x86_64-linux/lib

# 文件备份
sudo cp libcudnn.so. libcudnn.so.old
sudo cp libcudnn.so.7 libcudnn.so.7.old

# 删除文件
sudo rm -rf libcudnn.so
sudo rm -rf libcudnn.so.7

# 创建软链接
sudo ln -s libcudnn.so.7.6.5 libcudnn.so.7
sudo ln -s libcudnn.so.7 libcudnn.so
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Q：缺少nvcuvid.h文件

OpenCV 4.1 CUDA 10.1 linux下编译问题【fatal error: nvcuvid.h: No such file or directory】
解决方法

In file included from /home/yichao/360Downloads/opencv-3.3.0/opencv_build_dir/modules/cudacodec/opencv_cudacodec_pch_dephelp.cxx:1:0:
/home/yichao/360Downloads/opencv-3.3.0/modules/cudacodec/src/precomp.hpp:59:14: fatal error: nvcuvid.h: 没有那个文件或目录
     #include <nvcuvid.h>
              ^~~~~~~~~~~
compilation terminated.
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# 错误原因：
#include <nvcuvid.h>头文件在cuda10 以后就被弃了

# 解决方法：
1. 在英伟达官网下载组件
https://developer.nvidia.com/nvidia-video-codec-sdk#Download

2. 解压缩之后把  Video_Codec_SDK_11.1.5/Interface/ 下面的cuviddec.h 和 nvcuvid.h文件拷贝到/usr/include
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Q：cmake 失败

卸载opencv方法，参考资料：Ubuntu下卸载opencv

cd /home/yichao/360Downloads/opencv-3.3.0/samples/cpp/example_cmake

cmake .
make
./opencv_example

# 如果显示 Hello OpenCV，表示安装成功
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CMake Error at /usr/local/lib/cmake/opencv4/OpenCVModules.cmake:165 (message):
  The imported target "opencv_core" references the file

     "/usr/local/lib/libopencv_core.so.4.5.3"

  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/local/lib/cmake/opencv4/OpenCVModules.cmake"

  but not all the files it references.

Call Stack (most recent call first):
  /usr/local/lib/cmake/opencv4/OpenCVConfig.cmake:126 (include)
  CMakeLists.txt:10 (find_package)


-- Configuring incomplete, errors occurred!
See also "/home/yichao/360Downloads/opencv-3.3.0/samples/cpp/example_cmake/CMakeFiles/CMakeOutput.log".
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# 错误原因：
之前安装了opencv4.5.3版本，opencv4没有卸载干净，cmake找到了/usr/local/lib/cmake/opencv4，导致环境混乱

# 解决办法：
卸载opencv4.5.3，删除opencv4.5.3相关的文件

sudo rm -rf /usr/local/opencv4
sudo rm -rf /usr/local/lib/cmake/opencv4
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Q：开启BUILD_opencv_world

编译opencv库的BUILD_opencv_world选项
常规下编译opencv源码会生成很多库。如果在使用CMake生成VS解决方案时把 BUILD_opencv_world 选项勾上，则可以只生成一个库。

Q：第三方依赖包下载失败，导致编译失败