多目录工程的CmakeLists.txt编写

绪

开发一个cmake项目工程，一般会有多级目录，进行代码分类，这里以一个简单的例子介绍一下多目录工程的CmakeLists.txt编写。

功能为print.cpp调用hello.cpp 的hello()函数，main.cpp调用print.cpp 的print()函数。

1、工程目录

一级目录下有整体项目的CMakeLists.txt，子目录也分别有各自的CMakeLists.txt

2、主函数main.cpp

#include <iostream>
#include "print.h"

int main()
{
    print();
    return 0;
}

3、顶层CMakeLists.txt

cmake_minimum_required(VERSION 3.1.0)

project(helloxx)

# Add the source in project root directory
aux_source_directory(. DIRSRCS)

# Add header file include directories
include_directories(./ ./hello ./print)

# Add block directories
add_subdirectory(hello)
add_subdirectory(print)

# Target
add_executable(${PROJECT_NAME} ${DIRSRCS})
target_link_libraries(${PROJECT_NAME} hello print)

4、hello文件夹

• CMakeLists.txt

  aux_source_directory(. DIR_HELLO_SRCS)
  add_library(hello ${DIR_HELLO_SRCS})

• hello.cpp

  #include "hello.h"
  
  void hello()
  {
      cout << "hello,";
  }

• hello.h

  #ifndef HELLO_H
  #define HELLO_H
  
  #include <iostream>
  using namespace std;
  
  void hello();
  
  #endif

5、print文件夹

• CMakeLists.txt

  aux_source_directory(./ DIR_PRINT_SRCS)
  add_library(print ${DIR_PRINT_SRCS})
  
  target_link_libraries(print hello)	# 添加链接库，因为需要使用到hello.cpp的hello()函数

• print.cpp

  #include "print.h"
  
  void print()
  {
      hello();
      cout << "Cmake" << endl;
  }

• print.h

  #ifndef _PRINT_H
  #define _PRINT_H
  
  #include <iostream>
  #include "hello.h"
  using namespace std;
  
  void print();
  
  #endif