如何简单地将opencv包含在CMake的项目中

Question

我想在我的项目文件夹中使用opencv，因为我的其他同事不是都在同一平台（Linux，Windows）上工作。因此，为了使克隆和编译项目更容易，我只需要制作一个git克隆并启动编译即可在项目上工作。（不使用任何环境变量，完全独立）

与其他库（glfw）一样，我只是在我的依赖文件夹中添加了未压缩的文件夹。然后，我添加了add_subdirectory和target_link_libraries语句。

然后我遇到一个我无法解决的小错误。

以下有关我的项目的信息

1。项目文件夹结构

project
│   README.md
|   CMakeLists.txt                (my CMakeLists project)    
└───dependencies
│   └───opencv-4.1.2
│       │   CMakeLists.txt        (the original opencv CMakeLists (untouched))
│       │   ...
└───src
    │   main.cpp

2。我的CMakeLists内容

cmake_minimum_required(VERSION 3.15)
project(OpTests)

set(CMAKE_CXX_STANDARD 17)

add_subdirectory(dependencies/opencv-4.1.2)

add_executable(OpTests src/main.cpp)
target_link_libraries(OpTests opencv_core opencv_highgui opencv_imgproc opencv_videoio)

3。 main.cpp内容

#include <iostream>
#include <opencv2/opencv.hpp>

int main() 
    std::cout << CV_VERSION << std::endl;
    cv::Mat M(2,2, CV_8UC3, cv::Scalar(0,0,255));
    std::cout << "M = " << std::endl << " " << M << std::endl << std::endl;
    std::cout << "Hello, World!" << std::endl;
    return 0;

4。错误

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-- 
-- Configuring done
-- Generating done
-- Build files have been written to: /home/jeremy/CLionProjects/OpTests/cmake-build-debug
[  3%] Built target ittnotify
[  9%] Built target ippiw
[ 18%] Built target libjasper
[ 45%] Built target libwebp
[ 69%] Built target opencv_core
[ 90%] Built target opencv_imgproc
[ 93%] Built target opencv_imgcodecs
[ 96%] Built target opencv_videoio
[100%] Built target opencv_highgui
Scanning dependencies of target OpTests
[100%] Linking CXX executable bin/OpTests
CMakeFiles/OpTests.dir/src/main.cpp.o: In function `cv::String::~String()':
/usr/include/opencv2/core/cvstd.hpp:664: undefined reference to `cv::String::deallocate()'
CMakeFiles/OpTests.dir/src/main.cpp.o: In function `cv::String::operator=(cv::String const&)':
/usr/include/opencv2/core/cvstd.hpp:672: undefined reference to `cv::String::deallocate()'
collect2: error: ld returned 1 exit status
CMakeFiles/OpTests.dir/build.make:88: recipe for target 'bin/OpTests' failed
make[3]: *** [bin/OpTests] Error 1
CMakeFiles/Makefile2:81: recipe for target 'CMakeFiles/OpTests.dir/all' failed
make[2]: *** [CMakeFiles/OpTests.dir/all] Error 2
CMakeFiles/Makefile2:88: recipe for target 'CMakeFiles/OpTests.dir/rule' failed
make[1]: *** [CMakeFiles/OpTests.dir/rule] Error 2
Makefile:186: recipe for target 'OpTests' failed
make: *** [OpTests] Error 2

所以3个问题：

我做错了什么？是否可以简单地修复它而无需100行CMakeLists？

这是不好的做法吗？

提前谢谢您

美好的一天