CMakelist文件内容如下：

cmake_minimum_required(VERSION 3.2)
project(PISO)
set(CMAKE_CXX_STANDARD 14)
include_directories(C:/Users/DELL/Downloads/eigen-3.3.8)
add_executable(${PROJECT_NAME} main.cpp)

其中第一行为确定cmake的最低版本，第二行为项目名称，第三行是确定Cpp的标准，第五行为添加执行文件，eigen库的调用关键在于第四行：

include_directories(C:/Users/DELL/Downloads/eigen-3.3.8)

我们只需要下载eigen库，然后括号内写入库的文件位置（这里我直接放在下载路径下），即可直接调用。提供如下测试代码：

#include <iostream>
#include <Eigen/Dense>
using namespace Eigen;
using namespace std;
int main()
{
    MatrixXd m = MatrixXd::Random(3,3);
    m = (m + MatrixXd::Constant(3,3,1.2)) * 50;
    cout << "m =" << endl << m << endl;
    VectorXd v(3);
    v << 1, 2, 3;
    cout << "m * v =" << endl << m * v << endl;
}

上述代码运算结果为：

C:\Users\DELL\CLionProjects\untitled3\cmake-build-debug\PISO.exe
m =
10.1251 90.8741 45.0291
66.3585 68.5009 99.5962
29.3304 57.9873  92.284
m * v =
326.961
502.149
422.157

Process finished with exit code 0

附：eigen库的下载链接

find_package(Eigen3 3.2.6 REQUIRED)代码，则同样需要在CMakeLists.txt文件中添加set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR})代码，才能正确配置Eigen库。完整代码如下：

cmake_minimum_required(VERSION 3.24)
project(CLionEigen)

set(CMAKE_CXX_STANDARD 11)

set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR})

SET(EIGEN3_INCLUDE_DIR "C:\\3rdParty\\eigen-3.2.6\\eigen-3.2.6")
IF( NOT EIGEN3_INCLUDE_DIR )
    MESSAGE( FATAL_ERROR "Please point the environment variable EIGEN3_INCLUDE_DIR to the include directory of your Eigen3 installation.")
ENDIF()
INCLUDE_DIRECTORIES ( "${EIGEN3_INCLUDE_DIR}" )

# Eigen3
find_package(Eigen3 3.2.6 REQUIRED)

add_executable(CLionEigen main.cpp)#CLionEigen为项目名称

 


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