CMake找不到OpenCV庫

與此question類似，我在OS X 10.10.3上使用OpenCV和CMake時遇到了麻煩。CMake找不到OpenCV庫

經過很多麻煩，我終於設法在我的系統上構建了OpenCV 3.0 beta;頭文件現在位於/usr/local/include中，而這些庫文件應該位於/usr/local/lib。我有使用OpenCV的小程序，我CMakeLists.txt看起來像這樣

set(CMAKE_CXX_FLAGS   "-O3 -w") 
find_package(OpenCV REQUIRED) 
if(OpenCV_FOUND) 
    message("Found OpenCV") 
    message("Includes: " ${OpenCV_INCLUDE_DIRS}) 
endif(OpenCV_FOUND) 

add_executable(cannyDetector canny/canny.cpp) 

target_link_libraries(cannyDetector ${OpenCV_LIBS})

我得到通常

Undefined symbols for architecture x86_64: 
    "vtable for cv::_InputArray", referenced from: 
     _main in correctImage.o 
    NOTE: a missing vtable usually means the first non-inline virtual member function has no definition. 
    "vtable for cv::_OutputArray", referenced from: 
     _main in correctImage.o 
    NOTE: a missing vtable usually means the first non-inline virtual member function has no definition. 
ld: symbol(s) not found for architecture x86_64 
collect2: error: ld returned 1 exit status 
make[2]: *** [correctImage] Error 1 
make[1]: *** [CMakeFiles/correctImage.dir/all] Error 2 
make: *** [all] Error 2

變量OpenCV_LIBS包含

opencv_xphoto;opencv_xobjdetect;opencv_ximgproc;opencv_xfeatures2d;opencv_tracking;opencv_text;opencv_surface_matching;opencv_saliency;opencv_rgbd;opencv_reg;opencv_optflow;opencv_line_descriptor;opencv_latentsvm;opencv_ccalib;opencv_bioinspired;opencv_bgsegm;opencv_adas;opencv_videostab;opencv_videoio;opencv_video;opencv_ts;opencv_superres;opencv_stitching;opencv_shape;opencv_photo;opencv_objdetect;opencv_ml;opencv_imgproc;opencv_imgcodecs;opencv_highgui;opencv_hal;opencv_flann;opencv_features2d;opencv_core;opencv_calib3d

另外，手動編譯原理：

gcc -o canny $(pkg-config --cflags opencv3) $(pkg-config --libs opencv3) -lstdc++ -w -O3 ../canny/canny.cpp

（我不知道爲什麼我必須指定-lstdc++，但沒有它，鏈接失敗的另一個原因）。當運行make VERBOSE=1，下面的命令運行的可執行文件：

/opt/local/bin/g++ -O3 -w -lstdc++ -Wl,-search_paths_first -Wl,-headerpad_max_install_names CMakeFiles/cannyDetector.dir/canny/canny.o -o cannyDetector /usr/local/lib/libopencv_xphoto.3.0.0.dylib /usr/local/lib/libopencv_ximgproc.3.0.0.dylib /usr/local/lib/libopencv_tracking.3.0.0.dylib /usr/local/lib/libopencv_text.3.0.0.dylib /usr/local/lib/libopencv_surface_matching.3.0.0.dylib /usr/local/lib/libopencv_saliency.3.0.0.dylib /usr/local/lib/libopencv_rgbd.3.0.0.dylib /usr/local/lib/libopencv_reg.3.0.0.dylib /usr/local/lib/libopencv_optflow.3.0.0.dylib /usr/local/lib/libopencv_line_descriptor.3.0.0.dylib /usr/local/lib/libopencv_latentsvm.3.0.0.dylib /usr/local/lib/libopencv_ccalib.3.0.0.dylib /usr/local/lib/libopencv_bioinspired.3.0.0.dylib /usr/local/lib/libopencv_bgsegm.3.0.0.dylib /usr/local/lib/libopencv_adas.3.0.0.dylib /usr/local/lib/libopencv_videostab.3.0.0.dylib /usr/local/lib/libopencv_ts.a /usr/local/lib/libopencv_superres.3.0.0.dylib /usr/local/lib/libopencv_stitching.3.0.0.dylib /usr/local/lib/libopencv_photo.3.0.0.dylib /usr/local/lib/libopencv_objdetect.3.0.0.dylib /usr/local/lib/libopencv_hal.a /usr/local/lib/libopencv_xobjdetect.3.0.0.dylib /usr/local/lib/libopencv_xfeatures2d.3.0.0.dylib /usr/local/lib/libopencv_shape.3.0.0.dylib /usr/local/lib/libopencv_video.3.0.0.dylib /usr/local/lib/libopencv_calib3d.3.0.0.dylib /usr/local/lib/libopencv_features2d.3.0.0.dylib /usr/local/lib/libopencv_ml.3.0.0.dylib /usr/local/lib/libopencv_highgui.3.0.0.dylib /usr/local/lib/libopencv_videoio.3.0.0.dylib /usr/local/lib/libopencv_imgcodecs.3.0.0.dylib /usr/local/lib/libopencv_imgproc.3.0.0.dylib /usr/local/lib/libopencv_flann.3.0.0.dylib /usr/local/lib/libopencv_core.3.0.0.dylib /usr/local/lib/libopencv_hal.a -framework AGL -framework OpenGL /usr/local/share/OpenCV/3rdparty/lib/libippicv.a

但是，如果我走了命令，並通過輸入源文件../canny/canny.cpp更換輸入文件CMakeFiles/cannyDetector.dir/canny/canny.o，它的作品！

所以庫都在那裏，但它仍然不能編譯，因爲編譯器不能鏈接目標文件，但編譯和鏈接在一個步驟的作品。

任何人都可以建議這裏發生了什麼？

來源

2015-05-02 oarfish

使用make VERBOSE = yes獲取詳細輸出cmake如何調用編譯器 – arved

您*可能已經用'libstdC++'構建了OpenCV庫並且CMake可能試圖使用'libC++'。建議：嘗試在CMake文件中添加set（CMAKE_CXX_FLAGS「$ {CMAKE_CXX_FLAGS} -stdlib = libstdC++」）。 – Kiran

@Kiran你說得對，因爲該標誌肯定是必需的，但它的缺席並不會導致錯誤，但是CMake拒絕找到位於'usr/local/lib'中的庫。 – oarfish

在我的情況下的修復是指示CMake在哪裏尋找OpenCV配置模塊。

find_package(OpenCV REQUIRED PATHS /usr/local/share/OpenCV NO_DEFAULT_PATH) # manual specification of the OpenCVConfig.cmake path is necessary since otherwise, cmake assigns /opt/local a higher priority and ocv2.4 will be used

無論出於何種原因，/opt/local/share有更高的優先級比/usr/local/share，因此只被發現的OpenCV的2.4配置文件，但我用3.0。我不完全確定是什麼導致了鏈接錯誤，但可能有些代碼是從庫中移動到版本3.0中的頭文件，這些頭文件必須與用戶代碼一起編譯，但不是因爲CMake只包含版本2頭文件。

而且

include_directories(${OpenCV_INCLUDE_DIRS})

失蹤了。

來源

2015-05-16 15:02:50 oarfish

謝謝。它也幫助了我！ – Grigory

CMake找不到OpenCV庫

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