我试图用opencv 3.0构建一个应用程序，我得到一个“未定义的符号错误引用”
我的问题是符号是在我链接的库中定义的 .
编译命令：
g++ -o DisparityMap main.o tools.o emb.o moc_tools.o moc_emb.o -lopencv_highgui -lopencv_core -lopencv_imgproc -lopencv_imgcodecs -lopencv_calib3d -lQtGui -lQtCore -lpthread
我得到的错误：
/usr/bin/ld: twowindow.o: undefined reference to symbol '_ZN2cv6String10deallocateEv'
//usr/local/lib/libopencv_core.so.3.0: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
但有问题的符号实际上是在我链接到的库中定义的：
scanelf -l -s _ZN2cv6String10deallocateEv | grep _ZN2cv6String10deallocateEv
ET_DYN _ZN2cv6String10deallocateEv /usr/local/lib/libopencv_objdetect.so.3.0.0
ET_DYN _ZN2cv6String10deallocateEv /usr/local/lib/libopencv_photo.so.3.0.0
ET_DYN _ZN2cv6String10deallocateEv /usr/local/lib/libopencv_core.so.3.0.0
ET_DYN _ZN2cv6String10deallocateEv /usr/local/lib/libopencv_video.so.3.0.0
ET_DYN _ZN2cv6String10deallocateEv /usr/local/lib/libopencv_features2d.so.3.0.0
ET_DYN _ZN2cv6String10deallocateEv /usr/local/lib/libopencv_ml.so.3.0.0
ET_DYN _ZN2cv6String10deallocateEv /usr/local/lib/libopencv_highgui.so.3.0.0
ET_DYN _ZN2cv6String10deallocateEv /usr/local/lib/libopencv_videoio.so.3.0.0
ET_DYN _ZN2cv6String10deallocateEv /usr/local/lib/libopencv_stitching.so.3.0.0
ET_DYN _ZN2cv6String10deallocateEv /usr/local/lib/libopencv_videostab.so.3.0.0
ET_DYN _ZN2cv6String10deallocateEv /usr/local/lib/libopencv_superres.so.3.0.0
ET_DYN _ZN2cv6String10deallocateEv /usr/local/lib/libopencv_flann.so.3.0.0
ET_DYN _ZN2cv6String10deallocateEv /usr/local/lib/libopencv_imgproc.so.3.0.0
ET_DYN _ZN2cv6String10deallocateEv /usr/local/lib/libopencv_imgcodecs.so.3.0.0
ET_DYN _ZN2cv6String10deallocateEv /usr/local/lib/libopencv_calib3d.so.3.0.0
ET_DYN _ZN2cv6String10deallocateEv /usr/local/lib/libopencv_shape.so.3.0.0
ET_DYN _ZN2cv6String10deallocateEv /usr/local/lib/libopencv_objdetect.so.3.0.0
ET_DYN _ZN2cv6String10deallocateEv /usr/local/lib/libopencv_photo.so.3.0.0
ET_DYN _ZN2cv6String10deallocateEv /usr/local/lib/libopencv_core.so.3.0.0
ET_DYN _ZN2cv6String10deallocateEv /usr/local/lib/libopencv_video.so.3.0.0
ET_DYN _ZN2cv6String10deallocateEv /usr/local/lib/libopencv_features2d.so.3.0.0
ET_DYN _ZN2cv6String10deallocateEv /usr/local/lib/libopencv_ml.so.3.0.0
ET_DYN _ZN2cv6String10deallocateEv /usr/local/lib/libopencv_highgui.so.3.0.0
ET_DYN _ZN2cv6String10deallocateEv /usr/local/lib/libopencv_videoio.so.3.0.0
ET_DYN _ZN2cv6String10deallocateEv /usr/local/lib/libopencv_stitching.so.3.0.0
ET_DYN _ZN2cv6String10deallocateEv /usr/local/lib/libopencv_videostab.so.3.0.0
ET_DYN _ZN2cv6String10deallocateEv /usr/local/lib/libopencv_superres.so.3.0.0
ET_DYN _ZN2cv6String10deallocateEv /usr/local/lib/libopencv_flann.so.3.0.0
ET_DYN _ZN2cv6String10deallocateEv /usr/local/lib/libopencv_imgproc.so.3.0.0
ET_DYN _ZN2cv6String10deallocateEv /usr/local/lib/libopencv_imgcodecs.so.3.0.0
ET_DYN _ZN2cv6String10deallocateEv /usr/local/lib/libopencv_calib3d.so.3.0.0
ET_DYN _ZN2cv6String10deallocateEv /usr/local/lib/libopencv_shape.so.3.0.0
2 回答
这不是编译命令，它是一个链接命令 .
该错误引用
twowindow.o，这不在您的链接命令上 .因此，很难相信错误实际上来自您提供的链接命令 .
最有可能的是，错误来自不同的链接命令，并且该链接命令上没有
-lopencv_core.在链接库之前，请给出带-L标志的路径 .