.build_release/lib/libcaffe.so: undefined reference to cv::imread(cv::String const&, int)’ .
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我使用的版本是3.1.0，在编译工程的时候，遇到如下BUG
...CXX/LD -o .build_release/tools/convert_imageset.bin .build_release/lib/libcaffe.so: undefined reference to cv::imread(cv::String const&, int)’ .build_release/lib/libcaffe.so: undefined reference tocv::imencode(cv::String const&, cv::_InputArray const&, std::vector >&, std::vector > const&)’ .build_release/lib/libcaffe.so: undefined reference to `cv::imdecode(cv::_InputArray const&, int)’ collect2: error: ld returned 1 exit status make: * [.build_release/tools/convert_imageset.bin] Error 1
...
首先，我是已经配置过了opencv的，可以这样查询安装版本：
因为编译好了，理所当然，输出结果是3.1.0
所以出现上面的错误，应该是opencv_imgcodecs链接的问题，比较有效的解决方案是，把opencv需要的lib添加到Makefile文件中，找到LIBRARIES（在PYTHON_LIBRARIES := boost_python python2.7 前一行）并修改为：
LIBRARIES += glog gflags protobuf leveldb snappy \ lmdb boost_system hdf5_hl hdf5 m \ opencv_core opencv_highgui opencv_imgproc opencv_imgcodecs
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