"Undefined symbols for architecture armv7" when importing STATIC LIBRARY that contains OPENCV functions

There were two issues related to linking libraries:

1. Firstly, although my subproject had the opencv2.framework correctly added and linked to it, I also had to add the framework to my main project. This way I got rid of the cv::* linking problems;

2. The second issue was related to my cross-compiling Objective-C++ configuration. Since I was using libc++ as my Standard Library, I had to add -lc++ to my Other Linker Flags. In case you are using libstdc++ as your Standard Library, you should add -lstdc++ instead.

After those changes, it all worked perfectly! Good luck!

I think its because ur project is not linking to the C++ runtime .

Try adding libc++.dylib to ur linked Libraries.