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2015-09-13 08:32:41 -0600	commented answer	Sudden linker error with GCC 5.2.0 My code: Yes. But I don't generally rebuild all libraries that I use when I switch to a new compiler version. And since this "error" is explicitly mentioned in the release notes I would expect that in general that is also not necessary.
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2015-09-10 04:27:20 -0600	commented question	Sudden linker error with GCC 5.2.0 I now solved the problem by building OpenCV 3.0 from source. I never had to rebuild a library because of switching to a newer version of gcc. After reading a bit I assume the reason is that with GCC 5.2.0 a new ABI is activated by default. From the GCC release notes: If you get linker errors about undefined references to symbols that involve types in the std::__cxx11 namespace or the tag [abi:cxx11] then it probably indicates that you are trying to link together object files that were compiled with different values for the _GLIBCXX_USE_CXX11_ABI macro. This commonly happens when linking to a third-party library that was compiled with an older version of GCC. If the third-party library cannot be rebuilt with the new ABI then you will need to recompile your code with the old ABI. Switching to the old ABI works like this: The old ABI is still supported and can be used by defining the macro _GLIBCXX_USE_CXX11_ABI to 0 before including any C++ standard library headers. So maybe that will be of help to someone else.
2015-09-10 00:46:42 -0600	asked a question	Sudden linker error with GCC 5.2.0 I am using OpenCV 2.4 in a project and up to GCC 5.1.0 I had no problems with compiling. Suddenly, after installing GCC 5.2.0 (from source) I get a linker error for some of the OpenCV functions. The majority seems to work. Only the cs::im* functions seem to cause problems. CMakeFiles/2DSIL.dir/main.cpp.o: In function `main': /home/c7031105/Dropbox/2DSIL/main.cpp:35: undefined reference to `cv::imread(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int)' /home/c7031105/Dropbox/2DSIL/main.cpp:110: undefined reference to `cv::imwrite(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, cv::_InputArray const&, std::vector<int, std::allocator<int> > const&)' CMakeFiles/2DSIL.dir/V4.cpp.o: In function `V4::getWeights(std::vector<int, std::allocator<int> >, double&)': /home/c7031105/Dropbox/2DSIL/V4.cpp:313: undefined reference to `cv::imread(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int)' CMakeFiles/2DSIL.dir/V4.cpp.o: In function `V4::compare(std::vector<int, std::allocator<int> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)': /home/c7031105/Dropbox/2DSIL/V4.cpp:110: undefined reference to `cv::imread(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int)' CMakeFiles/2DSIL.dir/V4.cpp.o: In function `V4::getWeights(cv::Mat, cv::Mat, double&)': /home/c7031105/Dropbox/2DSIL/V4.cpp:352: undefined reference to `cv::imread(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int)' /home/c7031105/Dropbox/2DSIL/V4.cpp:379: undefined reference to `cv::imread(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int)' CMakeFiles/2DSIL.dir/V4.cpp.o: In function `V4::compare(cv::Mat, cv::Mat, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)': /home/c7031105/Dropbox/2DSIL/V4.cpp:179: undefined reference to `cv::imread(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int)' CMakeFiles/2DSIL.dir/V4.cpp.o: In function `void cv::Mat::push_back<int>(int const&)': /usr/local/include/opencv2/core/mat.hpp:689: undefined reference to `cv::Exception::Exception(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int)' CMakeFiles/2DSIL.dir/img_read_write.cpp.o: In function `dsil::visualize(cv::Mat const&, int)': /home/c7031105/Dropbox/2DSIL/img_read_write.cpp:91: undefined reference to `cv::namedWindow(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int)' /home/c7031105/Dropbox/2DSIL/img_read_write.cpp:92: undefined reference to `cv::imshow(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, cv::_InputArray const&)' CMakeFiles/2DSIL.dir/img_read_write.cpp.o: In function `dsil::imgwrite(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, cv::Mat const&)': /home/c7031105/Dropbox/2DSIL/img_read_write.cpp:49: undefined reference to `cv::imwrite(std ... (more)