CODEWITHSUNDEEP
c++linuxmakefilegnu-make
rossb83
rossb83

Reputation: 1762

Makefile produces undefined references

I am getting the following errors:

//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

Being produced from this makefile:

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)

The code appears to be correct and the libraries appear to be built correctly, I believe the error lies in the makefile.

Upvotes: 0

Views: 242

Answers (1)

Some programmer dude
Some programmer dude

Reputation: 409136

The order of the libraries when linking is significant, and should be in reverse dependency order. So if library B depends on library A, then you need to put B before A when linking.

In your case it seems that the smfitting library depends on one of the OpenCV libraries, as well as some other library, so you need to put it before those libraries.

Upvotes: 3

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