与此问题类似,在OS X 10.10.3上使用OpenCV和CMake时遇到麻烦。
经过很多麻烦之后,我终于设法在系统上构建了OpenCV 3.0 beta。标头现在驻留在其中/usr/local/include
,而libs(应有的)位于/usr/local/lib
。我有一些使用OpenCV的小程序,我的CMakeLists.txt
样子是这样
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} )
我得到平常的
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
变量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,手动编译工作:
gcc -o canny $(pkg-config --cflags opencv3) $(pkg-config --libs opencv3) -lstdc++ -w -O3 ../canny/canny.cpp
(我不知道为什么必须指定-lstdc++
,但是如果没有指定,则由于其他原因链接失败)。运行时make VERBOSE=1
,将为可执行文件运行以下命令:
/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,如果我接受命令并将输入文件替换CMakeFiles/cannyDetector.dir/canny/canny.o
为输入源文件../canny/canny.cpp
,则可以正常运行!
因此,所有的库都在那里,但是它仍然不能编译,因为编译器无法链接目标文件,但是一步编译和链接就可以了。
任何人都可以建议这里发生了什么吗?
我的解决方法是指示CMake在哪里寻找OpenCV配置模块。
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
无论出于何种原因,/opt/local/share
它的优先级都高于/usr/local/share
,因此只找到了OpenCV 2.4的配置文件,但我使用了3.0。我不确定导致链接错误的原因,但是可能某些代码从库移到了版本3.0中的标头中,该标头必须与用户代码一起进行编译,但不是因为CMake仅包含版本2标头。
也
include_directories(${OpenCV_INCLUDE_DIRS})
失踪。
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