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Editorial Team
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Asked: 2026-06-15T13:34:51+00:00

I have been using OpenCV for a while and also the imwrite function, but

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I have been using OpenCV for a while and also the imwrite function, but unfortunately this is not working any more.

I am running with OpenCV 2.4.3 with following sample code:

imwrite("somepath/somefile.png", myMat);

The error:

Undefined symbols for architecture x86_64:
"cv::imwrite(std::string const&, cv::_InputArray const&, std::__debug::vector<int,     std::allocator<int> > const&)", referenced from:
MyProject::this_callback(int, void*) in MyProject.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

The error looks somewhat familiar but i cannot determine whats wrong.

enter image description here

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1 Answer

  1. Editorial Team

    Yes, I’ve thought you were using XCode. I had the same problem. 🙂

    If you change the project setup so that:

    • you use GNU++11 as C++ language dialect
    • libstdc++ (GNU C++ standard) as C++ standard library

    your linking problem will go away.

    I use Apple LLVM 4.1.

    When I had this problem, I have tried just adding a new target to one of my old projects I knew, worked. Then I’ve just made that target a one-source-file program.

    This must be a “magic” part of XCode as I think there was a time I could not get the same project working after a restart. :S

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