Makefile產生未定義的引用

Question

我收到以下錯誤：

//usr/local/lib/libsmfitting.so: undefined reference to `VO_FaceParts::VO_GetOneFacePart(unsigned int) const'
//usr/local/lib/libsmfitting.so: undefined reference to `cv::estimateRigidTransform(cv::_InputArray const&, cv::_InputArray const&, bool)'
collect2: error: ld returned 1 exit status

從此makefile生成：

Cxx=g++
CXXFLAGS = -I/usr/local/include/opencv -I/usr/local/include/opencv2 -I/usr/local/include/vosm/smfitting -I/usr/local/include/vosm/smbuilding -I/usr/local/include/vosm/comalgs -I/usr/local/include/vosm/cvcommon -I/usr/local/include/vosm/ensembletraining -I/usr/local/include/vosm/featureextraction -I/usr/local/include/vosm/integraltransform -I/usr/local/include/vosm/utils
LIBS = -lopencv_ml -lopencv_calib3d -lopencv_legacy -lopencv_core -lopencv_highgui -lopencv_imgproc -lopencv_video -lopencv_objdetect -lcomalgs -lcvcommon -lensembletraining -lfeatureextraction -lintegraltransform -lsmbuilding -lutils -lboost_system -lboost_filesystem -lsmfitting

all: faceApp.cpp
    $(Cxx) -o faceApp faceApp.cpp $(CXXFLAGS) $(LIBS)

代碼似乎是正確的，並且庫似乎是正確構建的，我相信錯誤在於makefile。

Answer 1

鏈接時庫的順序很重要，並且應該是相反的依賴順序。 因此，如果庫B依賴於庫A，則在鏈接時需要將B放在A之前。

在您的情況下， smfitting庫似乎依賴於OpenCV庫之一以及其他庫，因此您需要將其放在這些庫之前。