Undefined symbols for architecture x86_64 error when linking OpenCV in Xcode -


i have problem linking opencv in xcode. installed opencv using brew:

brew tap homebrew/science sudo brew install opencv

i started new xcode commandline project, added /usr/local/lib , /usr/local/include library , header search path. added output of pkg-config --libs opencv other linker options.

but when try compile small sample program:

#include <opencv2/core/core.hpp> #include <opencv2/highgui/highgui.hpp>  int main(int argc, char *argv[]) {     cv::mat test;     cv::namedwindow( "display window", cv_window_autosize );// create window display.     cv::waitkey(0);                                          // wait keystroke in window     return 0; }

i following linker error:

undefined symbols architecture x86_64:   "cv::namedwindow(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, int)", referenced from:       _main in main.o ld: symbol(s) not found architecture x86_64

but able compile program on command line using

g++ `pkg-config --cflags --libs opencv` prog.cpp

so think problem way xcode set up. not able determine different between way xcode compiles , commandline argument.

does know reason error or has idea try investigate problem?

in xcode create new group inside project, right click it, choose add files project, navigate /usr/local/lib folder , add following basic libraries:

libopencv_core.dylib, libopencv_ml.dylib, libopencv_video.dylib

in previous versions of opencv library names be:

libcxcore.dylib, libcvaux.dylib, libcv.dylib, libhighgui.dylib, libml.dylib

(the libraries may in path depending on method used install opencv on mac.)

edit:

the above lines should not necessary if including dynamic libraries in linking phase op explains.

select project, go build settings tab, filter c++ standard library, , set parameter libstdc++ (gnu c++ standard library).


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