我一直在编译一些代码，发现-l 库标志对链接没有影响。之前没有真正处理过C ++，所以可能是一个简单的错误...
这是我正在使用的命令：
编译：
g++ -c -Wall -std=c++11 -I/usr/include/flycapture -I/usr/include/ -I/usr/local/include/opencv2 -I/usr/include/glibmm-2.4 -I/usr/lib64/glibmm-2.4/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include/ -I/usr/include/sigc++-2.0 -I/usr/lib64/sigc++-2.0/include/ -I/usr/include/boost FrameRateCounter.cpp -o FrameRateCounter.o
g++ -c -Wall -std=c++11 -I/usr/include/flycapture -I/usr/include/ -I/usr/local/include/opencv2 -I/usr/include/glibmm-2.4 -I/usr/lib64/glibmm-2.4/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include/ -I/usr/include/sigc++-2.0 -I/usr/lib64/sigc++-2.0/include/ -I/usr/include/boost SaveVideoClass.cpp -o SaveVideoClass.o
g++ -c -Wall -std=c++11 -I/usr/include/flycapture -I/usr/include/ -I/usr/local/include/opencv2 -I/usr/include/glibmm-2.4 -I/usr/lib64/glibmm-2.4/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include/ -I/usr/include/sigc++-2.0 -I/usr/lib64/sigc++-2.0/include/ -I/usr/include/boost SaveVideo.cpp -o SaveVideo.o
联：
g++ -L/usr/local/lib -L/usr/lib/x86_64-linux-gnu/ -lopencv_core -lopencv_highgui -lopencv_imgproc -lopencv_videoio -lsigc-2.0 -lglibmm-2.4 -lglib-2.0 -lstdc++ -lncurses -lflycapture FrameRateCounter.o SaveVideoClass.o SaveVideo.o -o saveVideo
编译工作正常，但是在链接时它给了我很多未定义的引用错误：
FrameRateCounter.o: In function `FrameRateCounter::FrameRateCounter(unsigned long)':
FrameRateCounter.cpp:(.text+0x48): undefined reference to `Glib::Timer::Timer()'
FrameRateCounter.cpp:(.text+0x58): undefined reference to `Glib::Mutex::Mutex()'
FrameRateCounter.cpp:(.text+0x68): undefined reference to `Glib::Timer::start()'
...
SaveVideoClass.cpp:(.text+0x1512): undefined reference to `cv::VideoWriter::VideoWriter(cv::String const&, int, double, cv::Size_<int>, bool)'
SaveVideoClass.cpp:(.text+0x1541): undefined reference to `cv::VideoWriter::~VideoWriter()'
SaveVideoClass.cpp:(.text+0x1565): undefined reference to `cv::VideoWriter::isOpened() const'
...
SaveVideoClass.cpp:(.text+0x2ea): undefined reference to `FlyCapture2::Camera::IsConnected()'
SaveVideoClass.cpp:(.text+0x308): undefined reference to `FlyCapture2::Camera::Disconnect()'
SaveVideoClass.cpp:(.text+0x30d): undefined reference to `FlyCapture2::Error::operator!=(FlyCapture2::ErrorType const&) const'
然后，我删除了所有-l 库标志，它给了我完全相同的错误消息。这就是为什么我认为这些标志没有生效的原因。但为什么呢？
这是pkg-config的一些输出，如果它有帮助：
pkg-config --libs opencv
-L/usr/local/lib -lopencv_stitching -lopencv_superres -lopencv_videostab -lopencv_aruco -lopencv_bgsegm -lopencv_bioinspired -lopencv_ccalib -lopencv_dnn -lopencv_dpm -lopencv_fuzzy -lopencv_line_descriptor -lopencv_optflow -lopencv_plot -lopencv_reg -lopencv_saliency -lopencv_stereo -lopencv_structured_light -lopencv_rgbd -lopencv_surface_matching -lopencv_tracking -lopencv_datasets -lopencv_text -lopencv_face -lopencv_xfeatures2d -lopencv_shape -lopencv_video -lopencv_ximgproc -lopencv_calib3d -lopencv_features2d -lopencv_flann -lopencv_xobjdetect -lopencv_objdetect -lopencv_ml -lopencv_xphoto -lippicv -lopencv_highgui -lopencv_videoio -lopencv_imgcodecs -lopencv_photo -lopencv_imgproc -lopencv_core
pkg-config --libs glib-2.0：
-lglib-2.0
pkg-config --libs glibmm-2.4：
-lglibmm-2.4 -lgobject-2.0 -lglib-2.0 -lsigc-2.0
如果有人想查看源代码，请参阅link。
更新
订单似乎不是问题。在对象之前给出了库，因此它们应该可用于FrameRateCounter.o，SaveVideoClass.o和SaveVideo.o