ios 6 and xcode 4.5 linker problems

http://answers.opencv.org/question/2868/ios-6-and-xcode-45-linker-problems/

st*, unsigned long)", referenced from:      cv::BmpDecoder::BmpDecoder() in opencv2(grfmt_bmp.o)      cv::BmpEncoder::BmpEncoder() in opencv2(grfmt_bmp.o)      cv::BmpEncoder::newEncoder() const in opencv2(grfmt_bmp.o)      cv::PxMEncoder::PxMEncoder() in opencv2(grfmt_pxm.o)      cv::PxMEncoder::newEncoder() const in opencv2(grfmt_pxm.o)      cv::SunRasterDecoder::SunRasterDecoder() in opencv2(grfmt_sunras.o)      cv::SunRasterEncoder::SunRasterEncoder() in opencv2(grfmt_sunras.o).......  "std::cout", referenced from:      cv::LDA::lda(cv::_InputArray const&, cv::_InputArray const&) in opencv2(lda.o)ld: symbol(s) not found for architecture armv7clang: error: linker command failed with exit code 1 (use -v to see invocation)Showing first 200 notices only

I have only added the generated opencv2.framework to my project and added:

#ifdef __cplusplus    #import <opencv2/opencv.hpp>#endif

At the beginning of my *-Prefix.pch file

Any idea what could be the problem?

Thank you!

2 Answers

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answered Dec 3 '12

John Brewer
51 ● 2 ● 5 

It looks like your project is not linking against the C++ runtime library. To link against the runtime library:

• Go to the "Build Phases" tab of the project .
• Choose the "Link Binary With Libraries" section.
• Click the "+" button at the bottom of the section.
• From the list that appears, choose either "libc++.dylib" for OpenCV 2.4.3, or "libstdc++.dylib" for OpenCV 2.4.2 and before.

Rebuild, and everything should work.