c++ - C++通过cmake调用opencv出现undefined reference to xxx错误(win11)？

Question

代码非常简单，就一个cpp文件，但是里面涉及opencv的cv::Mat/cv::imread/cv::imshow/cv::waitKey在用cmake构建时全部报错。
将涉及cv的部分注释掉，只保留一个std::cout<<"hello world!"<<std::endl;的话是可以正常构建，运行的，也就是说，cmake和c++本身没问题。

#include <iostream>#include <opencv2/core.hpp>#include <opencv2/imgcodecs.hpp>#include <opencv2/highgui.hpp>int main(void){    std::cout<<"hello world!"<<std::endl;    cv::Mat img1 = cv::imread("wallhaven-105871.jpg",cv::IMREAD_COLOR);    cv::imshow("img1", img1);    cv::waitKey(0);    return 0;}

build时具体的报错信息为：

[build] [ 50%] Linking CXX executable hello.exe[build] D:/keypro/mingw64posix/bin/../lib/gcc/x86_64-w64-mingw32/13.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: CMakeFiles\hello.dir/objects.a(helloworld.cpp.obj): in function `main':[build] D:/WORK/opencvproj/helloworld.cpp:9: undefined reference to `cv::imread(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int)'[build] D:/keypro/mingw64posix/bin/../lib/gcc/x86_64-w64-mingw32/13.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:/WORK/opencvproj/helloworld.cpp:10: undefined reference to `cv::imshow(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, cv::_InputArray const&)'[build] D:/keypro/mingw64posix/bin/../lib/gcc/x86_64-w64-mingw32/13.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:/WORK/opencvproj/helloworld.cpp:11: undefined reference to `cv::waitKey(int)'[build] D:/keypro/mingw64posix/bin/../lib/gcc/x86_64-w64-mingw32/13.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:/WORK/opencvproj/helloworld.cpp:13: undefined reference to `cv::Mat::~Mat()'[build] D:/keypro/mingw64posix/bin/../lib/gcc/x86_64-w64-mingw32/13.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:/WORK/opencvproj/helloworld.cpp:13: undefined reference to `cv::Mat::~Mat()'

以下为CMakeLists.txt:

cmake_minimum_required(VERSION 3.19)project(hello)set(OpenCV_DIR "D:/WORK/opencv/build/x64/vc16/lib")find_package(OpenCV REQUIRED CONFIG) # 此处的find_package是可以正常找到opencv的include_directories(${OpenCV_INCLUDE_DIRS})# dll lib文件所在目录均被加入链接路径link_directories( D:/WORK/opencv/build/x64/vc16/lib)link_directories( D:/WORK/opencv/build/x64/vc16/bin)add_executable(hello helloworld.cpp)# opencv库里所有lib dll文件都链接了target_link_libraries(${PROJECT_NAME} opencv_world470 opencv_world470d opencv_world470.dll opencv_world470d.dll)

完全没有头绪...望大佬解答！

Answer 1

cmake_minimum_required(VERSION 3.19)project(hello)set(OpenCV_DIR "D:/WORK/opencv/build")find_package(OpenCV REQUIRED) # 此处的find_package是可以正常找到opencv的add_executable(hello helloworld.cpp)# opencv库里所有lib dll文件都链接了target_link_libraries(hello ${OpenCV_LIBS})