C++-CMake：CMAKE_PREFIX_PATH【一个分号分隔的路径列表，用来指明软件/库安装路径前缀，以供find_××()命令搜索使用，这样就方便搜索可执行文件、头文件、库文件及相关配置】

爱被打了一巴掌 2023-09-25 13:06 58阅读 0赞

`CMAKE_PREFIX_PATH`是一个分号分隔的路径列表，用来指明软件/库安装路径前缀，以供`find_package()`，`find_program()`，`find_library()`，`find_file()`和`find_path()`命令搜索使用，这样就方便搜索可执行文件、头文件、库文件及相关配置文件等。

笔者将**Eigen-3.4.0**安装在了`/opt/eigen-3.4.0`目录下，在使用时可以这样写`CMakeLists.txt`

cmake_minimum_required(VERSION 3.5)
     
    project(program LANGUAGES CXX)
     
    set(CMAKE_CXX_STANDARD 11)
    set(CMAKE_CXX_STANDARD_REQUIRED ON)
     
    list(APPEND CMAKE_PREFIX_PATH "/opt/eigen-3.4.0") # 安装路径前缀
    find_package(Eigen3 REQUIRED)
    include_directories(${EIGEN3_INCLUDE_DIR})
    message("** Found Eigen3 in: ${EIGEN3_ROOT_DIR}")
     
    add_executable(${PROJECT_NAME} main.cpp)

命令`cmake`运行日志

-- The CXX compiler identification is GNU 9.4.0
    -- Check for working CXX compiler: /usr/bin/c++
    -- Check for working CXX compiler: /usr/bin/c++ -- works
    -- Detecting CXX compiler ABI info
    -- Detecting CXX compiler ABI info - done
    -- Detecting CXX compile features
    -- Detecting CXX compile features - done
    ** Found Eigen3 in: /opt/eigen-3.4.0
    -- Configuring done
    -- Generating done
    -- Build files have been written to: (这个路径内容太长，删掉了)

测试程序如下

#include <iostream>
    #include <Eigen/Eigen>
     
    int main(int argc, char* argv[])
    {
        std::cout << "Eigen3 version is : " 
                  << EIGEN_WORLD_VERSION << "." 
                  << EIGEN_MAJOR_VERSION << "." 
                  << EIGEN_MINOR_VERSION << std::endl;
        return 0;
    }

运行结果

![d3412f7b944f53e944fbb009cd46c9af.png][]

[CMake | 将路径添加到 CMAKE\_PREFIX\_PATH - Fitanium - 博客园][CMake _ _ CMAKE_PREFIX_PATH - Fitanium -]

[CMAKE\_PREFIX\_PATH — CMake 3.3.2 Documentation][CMAKE_PREFIX_PATH _ CMake 3.3.2 Documentation]

[d3412f7b944f53e944fbb009cd46c9af.png]: https://img-blog.csdnimg.cn/img_convert/d3412f7b944f53e944fbb009cd46c9af.png
[CMake _ _ CMAKE_PREFIX_PATH - Fitanium -]: https://www.cnblogs.com/Fitanium/p/16181605.html
[CMAKE_PREFIX_PATH _ CMake 3.3.2 Documentation]: https://cmake.org/cmake/help/v3.3/variable/CMAKE_PREFIX_PATH.html