cmake学习

一、创建一个cmake工程

Qt creator：file->New File or Porject...>>Non-Qt Project>>Plain C Project//或者//Plain C++ Project

CMakeLists.txt:

 1 cmake_minimum_required(VERSION 3.7.1)
 2 
 3 project(hello-world)
 4 
 5 set(SOURCE_FILES main.c)
 6 
 7 message(STATUS "This is BINARY dir " ${PROJECT_BINARY_DIR})
 8 message(STATUS "This is SOURCE dir " ${PROJECT_SOURCE_DIR})
 9 
10 add_executable(hello-world ${SOURCE_FILES})

CMakeLists

main.c:

#include <stdio.h>
int main() {
printf("Hello World. ");
return 0;
}

可以再文件目录下创建build，然后再build目录下执行cmake ..
这样的话创建的cmake和make中间文件就在build目录下了。执行make
然后./hello-world

二、创建子目录文件

helloCMake/CMakeLists.txt:

cmake_minimum_required(VERSION 3.2)
project(helloCMake)
ADD_SUBDIRECTORY(src bin)

helloCMake/src/CMakeLists.txt:

cmake_minimum_required(VERSION 2.8.4)
add_executable(helloCMake main.cpp)

main.cpp:

#include <iostream>
using namespace std;
int main()
{
cout << "Hello World!" << endl;
return 0;
}

CMake的语法总结:
PROJECT 指令的语法是：

PROJECT(projectname [CXX] [C] [Java])

project(hello cxx c)

SET 指令的语法是：

SET(VAR [VALUE] [CACHE TYPE DOCSTRING [FORCE]])

set(PX4_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}")

MESSAGE 指令的语法是：

MESSAGE([SEND_ERROR | STATUS | FATAL_ERROR] "message to display"...)

message(FATAL_ERROR "Update CMake and try again" )

ADD_SUBDIRECTORY 指令

ADD_SUBDIRECTORY(source_dir [binary_dir] [EXCLUDE_FROM_ALL])

ADD_SUBDIRECTORY(src bin)

无欲速，无见小利。欲速，则不达；见小利，则大事不成。