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[英]Getting undefined reference to OpenCV elements even when linking libraries. Using CMake
[英]Opencv linking libraries - Undefined Reference
我試圖在raspberry pi 3上編譯opencv代碼。但是,它始終顯示“ undefined reference ...”錯誤,我認為鏈接存在問題。
編譯:
g++ `pkg-config --libs --cflags opencv` Face_Detection.cpp
pkg-config opencv --libs:
-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
pkg-config opencv --cflags:
-I/opt/Deneme/Include/opencv -I/opt/Deneme/Include/
opencv.pc文件:
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
錯誤:
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&)'
提前致謝。
這是鏈接器順序錯誤。 嘗試改變
g++ `pkg-config --libs --cflags opencv` Face_Detection.cpp
至
g++ Face_Detection.cpp `pkg-config --libs --cflags opencv`
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