提问人:Maurizio Morando 提问时间:10/25/2018 最后编辑:Maurizio Morando 更新时间:10/26/2018 访问量:3629
未定义的引用...使用 OpenCV 编译 C++ 代码时,从命令行
Undefined reference to... when compiling c++ code with opencv, from command line
问:
首先对不起我的英语不好,然后,这看起来像是简单的问题,但我尝试了一切来解决它,但没有任何效果。我已经安装了 OpenCv3.2,并且正确安装了 build-essential。
我在上面链接了我的包含和错误。
包括:
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/videoio.hpp>
接缝以生成错误的代码:
Mat image = Mat::zeros( 1080, 1920, CV_8UC3 );
imshow("Image",image);
编译字符串:
g++ -o FD-progetto-vista-telecamera -O3 -std=gnu++11 -Wall ../FD-super_tracker.cpp -L/usr/local/lib/ -I/usr/local/include/ -lopencv_dnn -lopencv_ml -lopencv_shape -lopencv_stitching -lopencv_superres -lopencv_videostab -lopencv_calib3d -lopencv_features2d -lopencv_highgui -lopencv_videoio -lopencv_photo -lopencv_imgcodecs -lopencv_video -lopencv_objdetect -lopencv_imgproc -lopencv_flann -lopencv_core -lmysqlclient -lboost_system -lboost_filesystem -lm -ldl -ltiff
编译错误:
/tmp/cc7wFBb0.o: In function `project(std::map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, Telecamera_coord*, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, Telecamera_coord*> > >)':
FD-super_tracker.cpp:(.text+0xbdd): undefined reference to `cv::String::allocate(unsigned long)'
FD-super_tracker.cpp:(.text+0xbf9): undefined reference to `cv::imshow(cv::String const&, cv::_InputArray const&)'
FD-super_tracker.cpp:(.text+0xc01): undefined reference to `cv::String::deallocate()'
FD-super_tracker.cpp:(.text+0x1180): undefined reference to `cv::String::deallocate()'
collect2: error: ld returned 1 exit status
更新:
我也尝试过这个选项(如建议的那样):
g++ -o FD-progetto-vista-telecamera -O3 -std=gnu++11 -Wall ../FD-super_tracker.cpp -L/usr/local/lib/ -I/usr/local/include/ `pkg-config --libs opencv` -lmysqlclient -lboost_system -lboost_filesystem -lm -ldl -ltiff
结果如下:
/tmp/ccklBhL2.o: In function `project(std::map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, Telecamera_coord*, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, Telecamera_coord*> > >)':
FD-super_tracker.cpp:(.text+0xbdd): undefined reference to `cv::String::allocate(unsigned long)'
FD-super_tracker.cpp:(.text+0xbf9): undefined reference to `cv::imshow(cv::String const&, cv::_InputArray const&)'
FD-super_tracker.cpp:(.text+0xc01): undefined reference to `cv::String::deallocate()'
FD-super_tracker.cpp:(.text+0x1180): undefined reference to `cv::String::deallocate()'
----------------------解决----------------------
感谢大家的帮助,但是发生错误是因为我的设备上安装了多个版本的OpenCv。我卸载了所有opencv版本,然后从源代码重新安装了它。我希望这对某人有所帮助。
答:
0赞
Matthieu Brucher
10/25/2018
#1
您需要按正确的顺序提供库。在这里,您需要在行中推送稍后(就在之前)提供的库。cv::String
opencv_core
链接器的工作原理是逐步组装输出,在每个输出之后使用所需的内容,然后删除不需要的内容。因此,如果更高版本的库需要以前的库,则会失败,因为链接器不会遍历外部库。-l
正如 #BjoernUrban 所说,正确的顺序是由 给出的。pkg-config --libs opencv
评论
--cflags --libs opencv