c++ - 链接到从源代码构建的 OpenCV 时出现 Cmake 问题

Question

我克隆、编译并安装了 OpenCV 的主分支:

cmake .. -DCMAKE_INSTALL_PREFIX=/some/non-system-path \ 
         -DCMAKE_BUILD_TYPE=RelWithDebInfo \
         -DCMAKE_INSTALL_RPATH=/some/non-system-path

make
make install

通常的东西，除了我将它安装在用户路径中。为了测试它，我尝试运行以下“hello world”示例:

#include <stdio.h>
#include <opencv2/opencv.hpp>
using namespace cv;
int main(int argc, char** argv )
{
    if ( argc != 2 )
    {
        printf("usage: DisplayImage.out <Image_Path>\n");
        return -1;
    }
    Mat image;
    image = imread( argv[1], 1 );
    if ( !image.data )
    {
        printf("No image data \n");
        return -1;
    }
    namedWindow("Display Image", WINDOW_AUTOSIZE );
    imshow("Display Image", image);
    waitKey(0);
    return 0;
}

使用以下 CMakeLists.txt:

cmake_minimum_required(VERSION 2.8)
project( DisplayImage )
find_package( OpenCV REQUIRED )
include_directories( ${OpenCV_INCLUDE_DIRS} )
add_executable( DisplayImage main.cpp )
target_link_libraries( DisplayImage ${OpenCV_LIBS} )

请注意，这是来自 OpenCV 的精确示例。它失败并显示以下内容:

[ 50%] Building CXX object CMakeFiles/DisplayImage.dir/main.cpp.o
make[2]: *** No rule to make target 'opencv_calib3d-NOTFOUND', needed by 'DisplayImage'.  Stop.
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/DisplayImage.dir/all' failed
make[1]: *** [CMakeFiles/DisplayImage.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2

查看 /some/non-system-path/lib 存在 libopencv_calib3d.so 指向 libopencv_calib3d.so.3.3.1.

我认为这可能是 link_directories 问题，但是，设置它也没有解决问题。至于 ${OpenCV_LIBS} 我打印了它并得到了:

message(STATUS "OpenCV_LIBS = ${OpenCV_LIBS}")
-- OpenCV_LIBS = opencv_calib3d;opencv_core;opencv_dnn;opencv_features2d;opencv_flann;opencv_highgui;opencv_imgcodecs;opencv_imgproc;opencv_ml;opencv_objdetect;opencv_photo;opencv_shape;opencv_stitching;opencv_superres;opencv_video;opencv_videoio;opencv_videostab;opencv_viz

有什么想法吗？

Answer 1

我在使用 CMake 的 Visual Studio 2019 在 Windows 10 上构建 OpenCV 时遇到了这个问题。 x64-Debug 配置构建成功，但 x64-Release 有 opencv_calib3d-NOTFOUND 错误。

引自 alalek comment :

OpenCV supported builds are Debug and Release only. Other build configurations are not supported at all and proper compiler flags are not applied.

我注意到 CMakeSettings.json 的 RelWithDebInfo 配置类型为 x64-Release。所以我将其更改为 Release 配置类型并解决了问题。

P. S. 还描述了可能的解决方案 here , 但我没有尝试。