Question

我使用从itseez github repo获得的源代码安装了OpenCV3.0。我将安装前缀设置为/home/ubuntu/installed_libs/。一切顺利。我甚至在/etc/ld.so.conf.d/local.conf然后sudo ldconfig设置了ldconfig路径。

但是在我的项目（CMake）中，我找不到新安装的目录。

当我在构建目录中执行cmake ../时，它会抛出以下错误。我在答案中提出了一些改变。

cmake_minimum_required(VERSION 2.8)
project( DisplayImage )
set(OpenCV_DIR /home/ubuntu/installed_libs/share/OpenCV)
find_package( OpenCV )
add_executable( DisplayImage DisplayImage.cpp )
target_link_libraries( DisplayImage ${OpenCV_LIBRARIES} )

message(STATUS "OpenCV_FOUND=${OpenCV_FOUND}")
message(STATUS "OpenCV_INCLUDES=${OpenCV_INCLUDE_DIR}")
message(STATUS "OpenCV_LIBRARIES=${OpenCV_LIBRARIES}")
message(STATUS "OpenCV_DEFINATIONS=${OpenCV_DEFINATIONS}")
message(STATUS "OpenCV_DIR=${OpenCV_DIR}")

现在cmake成功发生。

 $ cmake ..
-- The C compiler identification is GNU 4.8.4
-- The CXX compiler identification is GNU 4.8.4
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Found CUDA: /usr/local/cuda (found suitable exact version "6.5") 
-- OpenCV_FOUND=1
-- OpenCV_INCLUDES=
-- OpenCV_LIBRARIES=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_cudev;opencv_cudawarping;opencv_cudastereo;opencv_cudaoptflow;opencv_cudaobjdetect;opencv_cudalegacy;opencv_cudaimgproc;opencv_cudafilters;opencv_cudafeatures2d;opencv_cudacodec;opencv_cudabgsegm;opencv_cudaarithm;opencv_core;opencv_calib3d
-- OpenCV_DEFINATIONS=
-- OpenCV_DIR=/home/ubuntu/installed_libs/share/OpenCV
-- Configuring done
-- Generating done
-- Build files have been written to: /home/ubuntu/ctry/opencvtest/build

然而，当我执行make时，我收到错误：

Scanning dependencies of target DisplayImage
[100%] Building CXX object CMakeFiles/DisplayImage.dir/DisplayImage.cpp.o
Linking CXX executable DisplayImage
CMakeFiles/DisplayImage.dir/DisplayImage.cpp.o: In function `main':
DisplayImage.cpp:(.text+0x94): undefined reference to `cv::imread(std::string const&, int)'
DisplayImage.cpp:(.text+0x108): undefined reference to `cv::namedWindow(std::string const&, int)'
DisplayImage.cpp:(.text+0x14e): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'
DisplayImage.cpp:(.text+0x15e): undefined reference to `cv::imshow(std::string const&, cv::_InputArray const&)'
collect2: error: ld returned 1 exit status
make[2]: *** [DisplayImage] Error 1
make[1]: *** [CMakeFiles/DisplayImage.dir/all] Error 2
make: *** [all] Error 2

我知道这是一个链接错误。我该如何解决这个问题？

详细说明显示它有用。

$ make VERBOSE=1
/usr/bin/cmake -H/home/ubuntu/ctry/opencvtest -B/home/ubuntu/ctry/opencvtest/build --check-build-system CMakeFiles/Makefile.cmake 0
/usr/bin/cmake -E cmake_progress_start /home/ubuntu/ctry/opencvtest/build/CMakeFiles /home/ubuntu/ctry/opencvtest/build/CMakeFiles/progress.marks
make -f CMakeFiles/Makefile2 all
make[1]: Entering directory `/home/ubuntu/ctry/opencvtest/build'
make -f CMakeFiles/DisplayImage.dir/build.make CMakeFiles/DisplayImage.dir/depend
make[2]: Entering directory `/home/ubuntu/ctry/opencvtest/build'
cd /home/ubuntu/ctry/opencvtest/build && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /home/ubuntu/ctry/opencvtest /home/ubuntu/ctry/opencvtest /home/ubuntu/ctry/opencvtest/build /home/ubuntu/ctry/opencvtest/build /home/ubuntu/ctry/opencvtest/build/CMakeFiles/DisplayImage.dir/DependInfo.cmake --color=
make[2]: Leaving directory `/home/ubuntu/ctry/opencvtest/build'
make -f CMakeFiles/DisplayImage.dir/build.make CMakeFiles/DisplayImage.dir/build
make[2]: Entering directory `/home/ubuntu/ctry/opencvtest/build'
Linking CXX executable DisplayImage
/usr/bin/cmake -E cmake_link_script CMakeFiles/DisplayImage.dir/link.txt --verbose=1
/usr/bin/c++       CMakeFiles/DisplayImage.dir/DisplayImage.cpp.o  -o DisplayImage  -L/usr/local/cuda/lib -rdynamic /home/ubuntu/installed_libs/lib/libopencv_videostab.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_videoio.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_video.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_ts.a /home/ubuntu/installed_libs/lib/libopencv_superres.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_stitching.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_shape.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_photo.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_objdetect.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_ml.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_imgproc.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_imgcodecs.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_highgui.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_hal.a /home/ubuntu/installed_libs/lib/libopencv_flann.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_features2d.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_cudev.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_cudawarping.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_cudastereo.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_cudaoptflow.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_cudaobjdetect.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_cudalegacy.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_cudaimgproc.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_cudafilters.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_cudafeatures2d.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_cudacodec.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_cudabgsegm.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_cudaarithm.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_core.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_calib3d.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_cudawarping.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_objdetect.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_cudafilters.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_cudaarithm.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_features2d.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_ml.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_highgui.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_videoio.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_imgcodecs.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_flann.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_video.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_imgproc.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_core.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_cudev.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_hal.a -ldl -lm -lpthread -lrt -lcudart -lnppc -lnppi -lnpps -lcufft -lcudart -lnppc -lnppi -lnpps -lcufft -Wl,-rpath,/usr/local/cuda/lib:/home/ubuntu/installed_libs/lib 
CMakeFiles/DisplayImage.dir/DisplayImage.cpp.o: In function `main':
DisplayImage.cpp:(.text+0x94): undefined reference to `cv::imread(std::string const&, int)'
DisplayImage.cpp:(.text+0x108): undefined reference to `cv::namedWindow(std::string const&, int)'
DisplayImage.cpp:(.text+0x14e): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'
DisplayImage.cpp:(.text+0x15e): undefined reference to `cv::imshow(std::string const&, cv::_InputArray const&)'
collect2: error: ld returned 1 exit status
make[2]: *** [DisplayImage] Error 1
make[2]: Leaving directory `/home/ubuntu/ctry/opencvtest/build'
make[1]: *** [CMakeFiles/DisplayImage.dir/all] Error 2
make[1]: Leaving directory `/home/ubuntu/ctry/opencvtest/build'
make: *** [all] Error 2

Answer 1

你应该检查输出：

ldconfig -p | grep -i opencv
pkg-config --cflags opencv
pkg-config --libs opencv

如果未列出任何内容，则ldconfig可能配置错误。如果列出了系统安装的OpenCV版本，则可能是搜索顺序的问题。

在任何一种情况下，您都可以尝试配置项目CMAKE_MODULE_PATH DisplayImage，该项目由CMake 在标准系统位置之前搜索。因此，假设您在DisplayImage的构建目录中$SRC_DIR/build为cmake -DCMAKE_MODULE_PATH="/home/ubuntu/installed_libs/<OpenCV directory>" <other options> ..，请按此配置您的项目

Resource targetResource= resourceResolver.get('../relative/path');
ValueMap props= targetResource.getValueMap();
String name= props.get("jcr:title",String.class);

同样有趣：what happens in the background of find_package()。

Answer 2

您可以添加

set(OpenCV_DIR /home/ubuntu/installed_libs/share/OpenCV)

到您的CMakeLists，所以它看起来像

cmake_minimum_required(VERSION 2.8)
project( DisplayImage )
set(OpenCV_DIR /home/ubuntu/installed_libs/share/OpenCV)
find_package( OpenCV REQUIRED 3.0 )
add_executable( DisplayImage DisplayImage.cpp )
target_link_libraries( DisplayImage ${OpenCV_LIBS} )

OpenCV 3.0源代码安装故障排除

2 个答案: