ubuntu下cmake自动化编译的一个例子

一个CMakeLists.txt的例子
参考:
https://www.hahack.com/codes/cmake/
https://blog.csdn.net/afei__/article/details/81201039

项目目录

-test

　　-include

　　　　-math.hpp

　　-src

　　　　-math.cpp

　　main.cpp

　　CMakeLists.txt

math.hpp:

double power(double base, int exponent);

math.cpp:

#include <math.hpp>

double power(double base, int exponent)
{
    int result = base;
    int i;

    if (exponent == 0) {
        return 1;
    }
    
    for(i = 1; i < exponent; ++i){
        result = result * base;
    }

    return result;
}

main.cpp:

#include <opencv2/opencv.hpp>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <iostream>
#include <math.hpp>


using namespace std;
using namespace cv;

int main(){
    cout<<CV_VERSION<<endl;
    Mat im=imread("test.jpg");
    if(!im.empty())
        cout<<"读取图片成功"<<endl;
    else
        cout<<"读取图片失败"<<endl;
    double res=power(2,3);
    cout<<res<<endl;
    return 0;
}

CMakeLists.txt:

#指定cmake 版本
CMAKE_MINIMUM_REQUIRED(VERSION 3.2)
#指定项目名称，一般和项目的文件夹名称对应
PROJECT(test)
SET(EXECUTABLE_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/../bin) 
#设置可执行文件的输出目录
SET(LIBRARY_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/../lib) 
#上面的语句能设置库文件的输出目录

#头文件目录
INCLUDE_DIRECTORIES(include /usr/local/include/)
#等价的设置方式
#set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -I$/usr/local/include")

#链接库路径
LINK_DIRECTORIES(/usr/local/lib/)
#等价的设置方式
#set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -L$/usr/local/lib")

#查找到指定的预编译库，并将它的路径存储在变量中
FIND_LIBRARY(OPENCV_LIB_PATH opencv_core)
MESSAGE(${OPENCV_LIB_PATH})#/usr/local/lib/libopencv_core.so

#源文件目录
AUX_SOURCE_DIRECTORY(. SRC_LIST)
#也可以这样匹配
#FILE(GLOB SRC_LIST "*.cpp" "src/*.cpp")

#添加子目录,子目录里有另一CMakeLists.txt待编译
#ADD_SUBDIRECTORY(src)

#生成链接库，可以指定SHARED,STATIC参数
#ADD_LIBRARY(math STATIC math.cpp)
ADD_LIBRARY(math SHARED src/math.cpp)

#设置一些变量SET,LIST(APPEND/REMOVE_ITEM)
#SET(SRC_LIST main.cpp)
#LIST(APPEND SRC_LIST src/math.cpp)
#LIST(REMOVE_ITEM SRC_LIST src/math.cpp)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11  -g")
SET(OPENCV_LIBS opencv_highgui opencv_imgcodecs opencv_core)

#添加要编译的可执行文件
ADD_EXECUTABLE(main ${SRC_LIST})

#添加可执行文件所需要链接的库
TARGET_LINK_LIBRARIES(main ${OPENCV_LIBS} math)