构建一个包含 opencv 库的 cmake c++ 项目

Question

我正在使用 CMake 构建一个 c++ 项目，该项目依赖于使用 Vcpkg 安装的 OpenCV 库。

这是我的 CMakeList.txt 文件：

# CMakeList.txt : CMake project for CMakeProject2, include source and define
# project specific logic here.
#
cmake_minimum_required (VERSION 3.8)
set( CMAKE_TOOLCHAIN_FILE "C:/vcpkg/scripts/buildsystems/vcpkg.cmake" )


# Find Package
find_package( OpenCV REQUIRED )

# Additional Include Directories
include_directories( ${OpenCV_INCLUDE_DIRS} )

message("hello world " ${OpenCV_LIB_DIR} ${OpenCV_LIBS})

# Additional Library Directories
link_directories( ${OpenCV_LIB_DIR} )
link_libraries(${OpenCV_LIBS})


#set( OpenCV_DIR "C:/vcpkg/installed/x64-windows/share/opencv" )
# Add source to this project's executable.
add_executable (CMakeProject2 "CMakeProject2.cpp" "CMakeProject2.h")

# Additional Dependencies
target_link_libraries( CMakeProject2 ${OpenCV_LIBS} )

CMakeProject2.cpp 文件：

#include "CMakeProject2.h"
#include <iostream>
#include "opencv2/opencv.hpp"

using namespace cv;

using namespace std;

int main()
{
    cout << "OpenCV version : " << CV_VERSION << endl;
    cout << "Hello CMake." << endl;
    return 0;
}

我正在使用这些命令来构建这些项目：

cmake ..\CMakeProject2 -G "MinGW Makefiles" -DCMAKE_TOOLCHAIN_FILE=C:\vcpkg\scripts\buildsystems\vcpkg.cmake
make

这就是我得到的：

\CMakeProject2\build>make
[ 50%] Linking CXX executable CMakeProject2.exe
CMakeFiles\CMakeProject2.dir/objects.a(CMakeProject2.cpp.obj):CMakeProject2.cpp:(.text$_ZN2cv6StringD1Ev[_ZN2cv6StringD1Ev]+0x11): undefined reference to `cv::String::deallocate()'
CMakeFiles\CMakeProject2.dir/objects.a(CMakeProject2.cpp.obj):CMakeProject2.cpp:(.text$_ZN2cv6StringaSERKS0_[_ZN2cv6StringaSERKS0_]+0x25): undefined reference to `cv::String::deallocate()'
collect2.exe: error: ld returned 1 exit status
make[2]: *** [CMakeProject2.exe] Erreur 1
make[1]: *** [CMakeFiles/CMakeProject2.dir/all] Erreur 2
make: *** [all] Erreur 2

Answer 1

我必须运行那些命令：

cmake -G "Visual Studio 15 2017 Win64" -DCMAKE_TOOLCHAIN_FILE=C:\vcpkg\scripts\buildsystems\vcpkg.cmake ..

和

cmake --build . --config Release

Answer 2

很快，您无法使用 -G "MinGW Makefiles"。

目前，vcpkg 不提供对 MinGW 的支持。

它是 requested, but eventually it has not been implemented 并且 vcpkg 维护者的结论性评论包括对任何想再次选择 MinGW 支持的人的建议：

However, we have not looked much into using mingw so far. If you have a functioning CMake toolchain file, you can follow our triplet documentation[1] to create a triplets/x64-windows-mingw.cmake file that will use that toolchain to build libraries.

[1] https://github.com/Microsoft/vcpkg/blob/master/docs/users/triplets.md

构建一个包含 opencv 库的 cmake c++ 项目

Building a cmake c++ project that includes opencv librarie

c++

opencv

mingw

cmake

vcpkg