Error when using imshow on OS X

I have setup OpenCV2 in XCode but unfortunately imshow does not work:

Undefined symbols for architecture x86_64:  "cv::imshow(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, cv::_InputArray const&)", referenced from:      _main in main.old: symbol(s) not found for architecture x86_64clang: error: linker command failed with exit code 1 (use -v to see invocation)

I am running OS X 10.8.4 with latest XCode.

I have attached a few images below to show the setup in XCode and the libraries. So far it seems that other functions work fine with OpenCV, except this.

 

I'm going to go out on a limb and say that you compiled OpenCV2 withlibstdc++, and are now compiling your application with libc++ support.

You need to compile OpenCV2 with the same C++ library, otherwise it will not be able to link.

if you do an nm of the OpenCV2 library, if it was compiled with libstdc++, it will look like:

cv::imshow(std::string const&, cv::_InputArray const&)

while if it was compiled with libc++, it would look like:

cv::imshow(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, cv::_InputArray const&)

to get the demangled symbol do:

nm library | c++filt | grep cv::imshow