linux基础-Cmake

参考链接：
https://www.cnblogs.com/ningskyer/articles/7158948.html
https://cmake.org/cmake-tutorial/

CMakeLists.txt

库的制作

# 查找当前目录下的所有源文件，保存到 DIR_LIB_SRCS 变量
aux_source_directory(. DIR_LIB_SRCS)
# 生成链接库
add_library (mylib STATIC ${DIR_LIB_SRCS})  #静态库 libmylib.a：STATIC  共享库libmylib.so：SHARED ，默认静态库

基本的CMakeLists.txt

说明：

1. 目录结构：src（源文件）、include（头文件）、lib（库文件）、CMakeLists.txt
2. 使用的时候将下面CMakeLists.txt中库名替换
3. mkdir build-> cd build-> cmake … -> make
4. bulid目录下会生成MakeFile 和 目标程序

#申明要求的cmake的最低版本
cmake_minimum_required (VERSION 2.6) 

#申明一个cmake工程
project (Tutorial)



include_directories(include)           #包含头文件
add_subdirectory(lib)                #添加一个子目录, 指明本cmake项目包含一个子目录


#将src目录下的所有源文件名保存到DIR_SRCS变量中
aux_source_directory(src DIR_SRCS)

#生成gdb调试程序
#set(CMAKE_BUILD_TYPE "Debug")
#set(CMAKE_CXX_FLAGS_DEBUG "$ENV{CXXFLAGS} -O0 -Wall -g -ggdb")
#set(CMAKE_CXX_FLAGS_RELEASE "$ENV{CXXFLAGS} -O3 -Wall")

add_executable(Tutorial ${DIR_SRCS})     #添加一个可执行文件   语法：add_executable(程序名 原码文件)
target_link_libraries(Tutorial 库名)

find_package

find_package命令最终通过 pkg-config 命令来查找是否有对应的package 模块，那么pkg-config 又是如何来知道我们的系统是否安装了某个模块呢？ pkg-config是通过 *.pc 的文件来判断。 例如 如果pkg-config找到了 libswscale2.11.pc 则就说明我们有 libswscale 2.11 库,
而 libswscale2.11.pc 里则定义了 header和lib的目录位置，通常在以下目录能找到pkgconfig目录：/usr/local/lib /usr/local/share/ /usr/lib。如果想加入其它目录：export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/Cellar/opencv/3.4.0/lib/pkgconfig

find_package(OpenCV REQUIRED)会在Ubuntu系统中找到OpenCVConfig.cmake，该文件定义了OpenCV_INCLUDE_DIRS和OpenCV_LIBS 等变量，因而可以使用 include_directories和target_link_libraries来访问这两个变量。

可以通过打开terminal输入locate OpenCVConfig.cmake来找到这个.cmake文件，用以确认系统确实安装了OpenCV.

可以指定库的查找路径，相当于指定特定的库版本

set(OpenCV_DIR /opt/share/OpenCV)

多目录CMakeLists.txt的编写

方法一：每个类的头文件和源文件在同一个文件夹

文件结构如下：而且Student继承Person

• Person

Person.h

#ifndef __PERSON_H
#define __PERSON_H
#include <iostream>
using namespace std;

class Person
{

public:
    Person(string name, int id);
    ~Person();

    void Print();

protected:
    string m_name;
    int m_ID;     
};


#endif

Person.cpp

#include "Person.h"


Person::Person(string name, int id)
{
    m_name = name;
    m_ID = id;
}


Person::~Person()
{

}


void Person::Print()
{
    cout << m_name << " : " << m_ID << endl;
}

CMakeLists.txt

aux_source_directory(. DIR_PERSON_SRC)
add_library(Person ${DIR_PERSON_SRC})

• Student

Student.h

#ifndef __STUDENT_H
#define __STUDENT_H

#include "Person.h"

class Student : public Person
{

public:
    Student( string name, int id, int scores);
    ~Student();

    void Print();


private:	
    int m_scores;
};

#endif

Student.cpp

#include "Student.h"


Student::Student(string name, int id, int scores):Person(name, id),m_scores(scores)
{

}


Student::~Student()
{

}


void Student::Print()
{
    cout << m_name << " :  " << m_ID << endl;
    cout << m_scores << endl;
}

CMakeLists.txt

include_directories(../Person)

aux_source_directory(. DIR_STUDENT_SRC)
add_library(Student ${DIR_STUDENT_SRC})

target_link_libraries(Student Person)

• 顶层

main.cpp

#include "Student.h"
#include "Student.h"


int main(void)
{

    Student s1( "juliana" , 1, 90);
    s1.Print();

}

CMakeLists.txt

cmake_minimum_required(VERSION 3.0)
project(my_test)



aux_source_directory(. DIRSRC)

include_directories(Person Student)

add_subdirectory(Person)
add_subdirectory(Student)


add_executable(my_test ${DIRSRC})
target_link_libraries(my_test Person Student)

方法二：所有类的头文件在一起(include),源文件在一起(src)

文件结构如下：

cmake_minimum_required(VERSION 3.5)
project(my_test)
set(CMAKE_CXX_FLAGS "-std=c++11")

#OpenCV
find_package(OpenCV REQUIRED) 

#pcl
find_package(PCL REQUIRED COMPONENT common io)
add_definitions(${PCL_DEFINITIONS})


#头文件目录
include_directories("/usr/include/eigen3/")
include_directories(include)


 #自己编写的源文件和头文件
FILE(GLOB_RECURSE CURRENT_INCLUDE include/*.hpp)
FILE(GLOB_RECURSE CURRENT_SOURCES src/*.cpp)


＃Debug
set(CMAKE_BUILD_TYPE "Debug") 
set(CMAKE_CXX_FLAGS_DEBUG "$ENV{CXXFLAGS} -O0 -Wall -g -ggdb") 
set(CMAKE_CXX_FLAGS_RELEASE "$ENV{CXXFLAGS} -O3 -Wall")


add_executable(my_test ${CURRENT_SOURCES} ${CURRENT_INCLUDE})
target_link_libraries(my_test ${OpenCV_LIBS} ${PCL_LIBRARIES})

---

常用

cmake_minimum_required(VERSION 2.8)
project(VIO_Data_Simulation)
set(CMAKE_CXX_FLAGS "-std=c++11")

set(CMAKE_BUILD_TYPE Debug)  # Release or Debug
set(EXECUTABLE_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/bin)
set(LIBRARY_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/lib)
list(APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake_modules)




FILE(GLOB_RECURSE CURRENT_INCLUDE include/*.hpp)
FILE(GLOB_RECURSE CURRENT_SOURCES src/*.cpp)

find_package(Eigen3 REQUIRED)
find_package(OpenCV REQUIRED)
find_package(Sophus REQUIRED)


include_directories(
    ${EIGEN3_INCLUDE_DIR}
    ${SOPHUS_INCLUDE_DIR}
    ${OPENCV_INCLUDE_DIR}
    "include"
    )

LIST(APPEND LINK_LIBS
    ${OpenCV_LIBS}
    ${Sophus_LIBRARIES}
    )


add_executable(data_generation main/main.cpp ${CURRENT_SOURCES} ${CURRENT_INCLUDE})
target_link_libraries(data_generation ${LINK_LIBS})

cmake-gui

• 安装：apt-get install cmake-qt-gui
• 打开：cmake-gui

使用：见opencv_contrib博客

mac 上 cmake rpath问题

参考