C++ Opencv链接库-未定义的引用

我试图在raspberry pi 3上编译opencv代码。但是，它总是给出“未定义引用…”错误，我认为链接有问题

编译：

g++ `pkg-config --libs --cflags opencv` Face_Detection.cpp

-L/opt/lib/ -L/opt/Deneme/opencv/a/ -opencv_calib3d -opencv_core 
-opencv_features2d -opencv_flann -opencv_highgui -opencv_imgcodecs 
-opencv_imgproc -opencv_ml -opencv_objdetect -opencv_photo -opencv_shape 
-opencv_stitching -opencv_superres -opencv_videoio -opencv_video
-opencv_calib3d_pch_dephelp -opencv_contrib_pch_dephelp 
-opencv_core_pch_dephelp -opencv_features2d_pch_dephelp 
-opencv_flann_pch_dephelp -opencv_gpu_pch_dephelp  
-opencv_haartraining_engine -opencv_highgui_pch_dephelp
-opencv_imgproc_pch_dephelp -opencv_legacy_pch_dephelp
-opencv_ml_pch_dephelp -opencv_objdetect_pch_dephelp 
-opencv_video_pch_dephelp

-I/opt/Deneme/Include/opencv -I/opt/Deneme/Include/

includedir=/opt/Deneme/Include/opencv
dir2=/opt/Deneme/Include/
libdir=/opt/lib/
libdir2=/opt/Deneme/opencv/a/

Name: opencv
Description: The opencv library
Version: 3.x.x
Cflags: -I${includedir} -I${dir2}
Libs: -L${libdir} -opencv_calib3d -opencv_core -opencv_features2d -         opencv_flann    -opencv_highgui -opencv_imgcodecs -opencv_imgproc -opencv_ml -opencv_objdetect -opencv_photo -opencv_shape  -opencv_stitching  -opencv_superres  -opencv_videoio  -opencv_video  -L${libdir2} -opencv_calib3d_pch_dephelp -opencv_contrib_pch_dephelp -opencv_core_pch_dephelp -opencv_features2d_pch_dephelp -opencv_flann_pch_dephelp -opencv_gpu_pch_dephelp -opencv_haartraining_engine -opencv_highgui_pch_dephelp -opencv_imgproc_pch_dephelp -opencv_legacy_pch_dephelp -opencv_ml_pch_dephelp -opencv_objdetect_pch_dephelp -opencv_video_pch_dephelp

Face_Detection.cpp:(.text+0x94): undefined reference to `cv::imread(std::string const&, int)'

Face_Detection.cpp:(.text+0xd8): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'

Face_Detection.cpp:(.text+0xec): undefined reference to `cv::_OutputArray::_OutputArray(cv::Mat&)'

Face_Detection.cpp:(.text+0x128): undefined reference to `cv::resize(cv::_InputArray const&, cv::_OutputArray const&, cv::Size_<int>, double, double, int)'

Face_Detection.cpp:(.text+0x1e8): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'

Face_Detection.cpp:(.text+0x218): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'

Face_Detection.cpp:(.text+0x250): undefined reference to `cv::_OutputArray::_OutputArray(cv::Mat&)'

Face_Detection.cpp:(.text+0x26c): undefined reference to `cv::hconcat(cv::_InputArray const&, cv::_InputArray const&, cv::_OutputArray const&)'

Face_Detection.cpp:(.text+0x298): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'

Face_Detection.cpp:(.text+0x2c8): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'

pkg config opencv--libs:

g++ `pkg-config --libs --cflags opencv` Face_Detection.cpp

-L/opt/lib/ -L/opt/Deneme/opencv/a/ -opencv_calib3d -opencv_core 
-opencv_features2d -opencv_flann -opencv_highgui -opencv_imgcodecs 
-opencv_imgproc -opencv_ml -opencv_objdetect -opencv_photo -opencv_shape 
-opencv_stitching -opencv_superres -opencv_videoio -opencv_video
-opencv_calib3d_pch_dephelp -opencv_contrib_pch_dephelp 
-opencv_core_pch_dephelp -opencv_features2d_pch_dephelp 
-opencv_flann_pch_dephelp -opencv_gpu_pch_dephelp  
-opencv_haartraining_engine -opencv_highgui_pch_dephelp
-opencv_imgproc_pch_dephelp -opencv_legacy_pch_dephelp
-opencv_ml_pch_dephelp -opencv_objdetect_pch_dephelp 
-opencv_video_pch_dephelp

-I/opt/Deneme/Include/opencv -I/opt/Deneme/Include/

includedir=/opt/Deneme/Include/opencv
dir2=/opt/Deneme/Include/
libdir=/opt/lib/
libdir2=/opt/Deneme/opencv/a/

Name: opencv
Description: The opencv library
Version: 3.x.x
Cflags: -I${includedir} -I${dir2}
Libs: -L${libdir} -opencv_calib3d -opencv_core -opencv_features2d -         opencv_flann    -opencv_highgui -opencv_imgcodecs -opencv_imgproc -opencv_ml -opencv_objdetect -opencv_photo -opencv_shape  -opencv_stitching  -opencv_superres  -opencv_videoio  -opencv_video  -L${libdir2} -opencv_calib3d_pch_dephelp -opencv_contrib_pch_dephelp -opencv_core_pch_dephelp -opencv_features2d_pch_dephelp -opencv_flann_pch_dephelp -opencv_gpu_pch_dephelp -opencv_haartraining_engine -opencv_highgui_pch_dephelp -opencv_imgproc_pch_dephelp -opencv_legacy_pch_dephelp -opencv_ml_pch_dephelp -opencv_objdetect_pch_dephelp -opencv_video_pch_dephelp

Face_Detection.cpp:(.text+0x94): undefined reference to `cv::imread(std::string const&, int)'

Face_Detection.cpp:(.text+0xd8): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'

Face_Detection.cpp:(.text+0xec): undefined reference to `cv::_OutputArray::_OutputArray(cv::Mat&)'

Face_Detection.cpp:(.text+0x128): undefined reference to `cv::resize(cv::_InputArray const&, cv::_OutputArray const&, cv::Size_<int>, double, double, int)'

Face_Detection.cpp:(.text+0x1e8): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'

Face_Detection.cpp:(.text+0x218): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'

Face_Detection.cpp:(.text+0x250): undefined reference to `cv::_OutputArray::_OutputArray(cv::Mat&)'

Face_Detection.cpp:(.text+0x26c): undefined reference to `cv::hconcat(cv::_InputArray const&, cv::_InputArray const&, cv::_OutputArray const&)'

Face_Detection.cpp:(.text+0x298): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'

Face_Detection.cpp:(.text+0x2c8): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'

pkg config opencv--cflags:

g++ `pkg-config --libs --cflags opencv` Face_Detection.cpp

-L/opt/lib/ -L/opt/Deneme/opencv/a/ -opencv_calib3d -opencv_core 
-opencv_features2d -opencv_flann -opencv_highgui -opencv_imgcodecs 
-opencv_imgproc -opencv_ml -opencv_objdetect -opencv_photo -opencv_shape 
-opencv_stitching -opencv_superres -opencv_videoio -opencv_video
-opencv_calib3d_pch_dephelp -opencv_contrib_pch_dephelp 
-opencv_core_pch_dephelp -opencv_features2d_pch_dephelp 
-opencv_flann_pch_dephelp -opencv_gpu_pch_dephelp  
-opencv_haartraining_engine -opencv_highgui_pch_dephelp
-opencv_imgproc_pch_dephelp -opencv_legacy_pch_dephelp
-opencv_ml_pch_dephelp -opencv_objdetect_pch_dephelp 
-opencv_video_pch_dephelp

-I/opt/Deneme/Include/opencv -I/opt/Deneme/Include/

includedir=/opt/Deneme/Include/opencv
dir2=/opt/Deneme/Include/
libdir=/opt/lib/
libdir2=/opt/Deneme/opencv/a/

Name: opencv
Description: The opencv library
Version: 3.x.x
Cflags: -I${includedir} -I${dir2}
Libs: -L${libdir} -opencv_calib3d -opencv_core -opencv_features2d -         opencv_flann    -opencv_highgui -opencv_imgcodecs -opencv_imgproc -opencv_ml -opencv_objdetect -opencv_photo -opencv_shape  -opencv_stitching  -opencv_superres  -opencv_videoio  -opencv_video  -L${libdir2} -opencv_calib3d_pch_dephelp -opencv_contrib_pch_dephelp -opencv_core_pch_dephelp -opencv_features2d_pch_dephelp -opencv_flann_pch_dephelp -opencv_gpu_pch_dephelp -opencv_haartraining_engine -opencv_highgui_pch_dephelp -opencv_imgproc_pch_dephelp -opencv_legacy_pch_dephelp -opencv_ml_pch_dephelp -opencv_objdetect_pch_dephelp -opencv_video_pch_dephelp

Face_Detection.cpp:(.text+0x94): undefined reference to `cv::imread(std::string const&, int)'

Face_Detection.cpp:(.text+0xd8): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'

Face_Detection.cpp:(.text+0xec): undefined reference to `cv::_OutputArray::_OutputArray(cv::Mat&)'

Face_Detection.cpp:(.text+0x128): undefined reference to `cv::resize(cv::_InputArray const&, cv::_OutputArray const&, cv::Size_<int>, double, double, int)'

Face_Detection.cpp:(.text+0x1e8): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'

Face_Detection.cpp:(.text+0x218): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'

Face_Detection.cpp:(.text+0x250): undefined reference to `cv::_OutputArray::_OutputArray(cv::Mat&)'

Face_Detection.cpp:(.text+0x26c): undefined reference to `cv::hconcat(cv::_InputArray const&, cv::_InputArray const&, cv::_OutputArray const&)'

Face_Detection.cpp:(.text+0x298): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'

Face_Detection.cpp:(.text+0x2c8): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'

opencv.pc文件：

g++ `pkg-config --libs --cflags opencv` Face_Detection.cpp

-L/opt/lib/ -L/opt/Deneme/opencv/a/ -opencv_calib3d -opencv_core 
-opencv_features2d -opencv_flann -opencv_highgui -opencv_imgcodecs 
-opencv_imgproc -opencv_ml -opencv_objdetect -opencv_photo -opencv_shape 
-opencv_stitching -opencv_superres -opencv_videoio -opencv_video
-opencv_calib3d_pch_dephelp -opencv_contrib_pch_dephelp 
-opencv_core_pch_dephelp -opencv_features2d_pch_dephelp 
-opencv_flann_pch_dephelp -opencv_gpu_pch_dephelp  
-opencv_haartraining_engine -opencv_highgui_pch_dephelp
-opencv_imgproc_pch_dephelp -opencv_legacy_pch_dephelp
-opencv_ml_pch_dephelp -opencv_objdetect_pch_dephelp 
-opencv_video_pch_dephelp

-I/opt/Deneme/Include/opencv -I/opt/Deneme/Include/

includedir=/opt/Deneme/Include/opencv
dir2=/opt/Deneme/Include/
libdir=/opt/lib/
libdir2=/opt/Deneme/opencv/a/

Name: opencv
Description: The opencv library
Version: 3.x.x
Cflags: -I${includedir} -I${dir2}
Libs: -L${libdir} -opencv_calib3d -opencv_core -opencv_features2d -         opencv_flann    -opencv_highgui -opencv_imgcodecs -opencv_imgproc -opencv_ml -opencv_objdetect -opencv_photo -opencv_shape  -opencv_stitching  -opencv_superres  -opencv_videoio  -opencv_video  -L${libdir2} -opencv_calib3d_pch_dephelp -opencv_contrib_pch_dephelp -opencv_core_pch_dephelp -opencv_features2d_pch_dephelp -opencv_flann_pch_dephelp -opencv_gpu_pch_dephelp -opencv_haartraining_engine -opencv_highgui_pch_dephelp -opencv_imgproc_pch_dephelp -opencv_legacy_pch_dephelp -opencv_ml_pch_dephelp -opencv_objdetect_pch_dephelp -opencv_video_pch_dephelp

Face_Detection.cpp:(.text+0x94): undefined reference to `cv::imread(std::string const&, int)'

Face_Detection.cpp:(.text+0xd8): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'

Face_Detection.cpp:(.text+0xec): undefined reference to `cv::_OutputArray::_OutputArray(cv::Mat&)'

Face_Detection.cpp:(.text+0x128): undefined reference to `cv::resize(cv::_InputArray const&, cv::_OutputArray const&, cv::Size_<int>, double, double, int)'

Face_Detection.cpp:(.text+0x1e8): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'

Face_Detection.cpp:(.text+0x218): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'

Face_Detection.cpp:(.text+0x250): undefined reference to `cv::_OutputArray::_OutputArray(cv::Mat&)'

Face_Detection.cpp:(.text+0x26c): undefined reference to `cv::hconcat(cv::_InputArray const&, cv::_InputArray const&, cv::_OutputArray const&)'

Face_Detection.cpp:(.text+0x298): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'

Face_Detection.cpp:(.text+0x2c8): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'

错误：

g++ `pkg-config --libs --cflags opencv` Face_Detection.cpp

-L/opt/lib/ -L/opt/Deneme/opencv/a/ -opencv_calib3d -opencv_core 
-opencv_features2d -opencv_flann -opencv_highgui -opencv_imgcodecs 
-opencv_imgproc -opencv_ml -opencv_objdetect -opencv_photo -opencv_shape 
-opencv_stitching -opencv_superres -opencv_videoio -opencv_video
-opencv_calib3d_pch_dephelp -opencv_contrib_pch_dephelp 
-opencv_core_pch_dephelp -opencv_features2d_pch_dephelp 
-opencv_flann_pch_dephelp -opencv_gpu_pch_dephelp  
-opencv_haartraining_engine -opencv_highgui_pch_dephelp
-opencv_imgproc_pch_dephelp -opencv_legacy_pch_dephelp
-opencv_ml_pch_dephelp -opencv_objdetect_pch_dephelp 
-opencv_video_pch_dephelp

-I/opt/Deneme/Include/opencv -I/opt/Deneme/Include/

includedir=/opt/Deneme/Include/opencv
dir2=/opt/Deneme/Include/
libdir=/opt/lib/
libdir2=/opt/Deneme/opencv/a/

Name: opencv
Description: The opencv library
Version: 3.x.x
Cflags: -I${includedir} -I${dir2}
Libs: -L${libdir} -opencv_calib3d -opencv_core -opencv_features2d -         opencv_flann    -opencv_highgui -opencv_imgcodecs -opencv_imgproc -opencv_ml -opencv_objdetect -opencv_photo -opencv_shape  -opencv_stitching  -opencv_superres  -opencv_videoio  -opencv_video  -L${libdir2} -opencv_calib3d_pch_dephelp -opencv_contrib_pch_dephelp -opencv_core_pch_dephelp -opencv_features2d_pch_dephelp -opencv_flann_pch_dephelp -opencv_gpu_pch_dephelp -opencv_haartraining_engine -opencv_highgui_pch_dephelp -opencv_imgproc_pch_dephelp -opencv_legacy_pch_dephelp -opencv_ml_pch_dephelp -opencv_objdetect_pch_dephelp -opencv_video_pch_dephelp

Face_Detection.cpp:(.text+0x94): undefined reference to `cv::imread(std::string const&, int)'

Face_Detection.cpp:(.text+0xd8): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'

Face_Detection.cpp:(.text+0xec): undefined reference to `cv::_OutputArray::_OutputArray(cv::Mat&)'

Face_Detection.cpp:(.text+0x128): undefined reference to `cv::resize(cv::_InputArray const&, cv::_OutputArray const&, cv::Size_<int>, double, double, int)'

Face_Detection.cpp:(.text+0x1e8): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'

Face_Detection.cpp:(.text+0x218): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'

Face_Detection.cpp:(.text+0x250): undefined reference to `cv::_OutputArray::_OutputArray(cv::Mat&)'

Face_Detection.cpp:(.text+0x26c): undefined reference to `cv::hconcat(cv::_InputArray const&, cv::_InputArray const&, cv::_OutputArray const&)'

Face_Detection.cpp:(.text+0x298): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'

Face_Detection.cpp:(.text+0x2c8): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'

Face_Detection.cpp:（.text+0x94）：未定义对“cv:：imread（std:：string const&，int）”的引用
Face_Detection.cpp:（.text+0xd8）：未定义对“cv:：_InputArray:：_InputArray（cv:：Mat const&）”的引用
Face_Detection.cpp:（.text+0xec）：未定义对“cv:：_OutputArray:：_OutputArray（cv:：Mat&）”的引用
Face_Detection.cpp:（.text+0x128）：对“cv:：resize（cv:：_InputArray常量和，cv:_OutputArray常量和，cv:：Size，double，double，int）”的未定义引用
Face_Detection.cpp:（.text+0x1e8）：对“cv:：_InputArray:：_InputArray（cv:：Mat const&）”的未定义引用
Face_Detection.cpp:（.text+0x218）：未定义对“cv:：_InputArray:：_InputArray（cv:：Mat const&）”的引用
Face_Detection.cpp:（.text+0x250）：对“cv:：_OutputArray:：_OutputArray（cv:：Mat&）”的未定义引用
Face_Detection.cpp:（.text+0x26c）：未定义对“cv:：hconcat（cv:：_inputarrayconst&，cv:_inputarrayconst&，cv:_outputarrayconst&）”的引用
Face_Detection.cpp:（.text+0x298）：未定义对“cv:：_InputArray:：_InputArray（cv:：Mat const&）”的引用
Face_Detection.cpp:（.text+0x2c8）：未定义对“cv:：_InputArray:：_InputArray（cv:：Mat const&）”的引用

---

提前感谢。

这是链接器订单错误。尝试改变

g++ `pkg-config --libs --cflags opencv` Face_Detection.cpp

到

---

您可以找出哪个lib具有imread/resize/hconcat，并在调用g++时手动添加它，以检查问题是在查找lib中还是在使用pkg config时。另外，你确定opencv\u flann处理正确吗？我按照你说的做了，但仍然会出现同样的错误。你是从源代码构建opencv的吗？您是否运行了

sudo ldconfig-v

？是的，我运行了ldconfig-v。输出不包含任何这些库，但我运行export LD_LIBRARY_PATH=/opt/lib/i不确定，但尝试在

/etc/LD.so.conf.d/

中创建一个costment

opencv.conf

config。此文件仅包含opencv库路径，

/opt/lib/

和

/opt/Deneme/opencv/a/

。运行

ldconf

并尝试重新启动pi。或者简单地将

/opt/lib

中的所有lib链接到

/usr/local/lib

，并制作一些服装到

opencv.pc