hello world

代码

main.c

#include<stdio.h>
int main(void){
    printf("hello world\n");
    return 0;
}

CMakeLists.txt

# 指定最小版本
cmake_minimum_required (VERSION 3.3)
# 指定工程名和语言类型
project (hello C)
# debug
set(CMAKE_BUILD_TYPE "Debug")
# c99
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c99 -g")
# 指定源码列表
aux_source_directory(. SRCS)
# 指定可执行程序
add_executable(hello ${SRCS})

运行

[root@cstudy hello]# mkdir build
[root@cstudy hello]# cd build/
[root@cstudy build]# cmake ..
-- The C compiler identification is GNU 4.8.5
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Configuring done
-- Generating done
-- Build files have been written to: /root/code/cmake/hello/build
[root@cstudy build]# make
Scanning dependencies of target hello
[ 50%] Building C object CMakeFiles/hello.dir/main.c.o
[100%] Linking C executable hello
[100%] Built target hello
[root@cstudy build]# ./hello 
hello world
[root@cstudy build]# 

添加子目录

目录结构

├── CMakeLists.txt
├── include
│   └── util.h
└── src
    ├── CMakeLists.txt
    ├── main.c
    └── util.c

顶层 CMakeLists.txt

# 指定最小版本
cmake_minimum_required (VERSION 3.3)
# 指定工程名和语言类型
project (hello C)
# debug
set(CMAKE_BUILD_TYPE "Debug")
# c99
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c99 -g")
# 添加子目录
add_subdirectory(src)

子目录 CMakeLists.txt

# 头文件目录
include_directories(${PROJECT_SOURCE_DIR}/include)
# 源文件列表
aux_source_directory(. SRCS)
# 可执行文件目录
set(EXECUTABLE_OUTPUT_PATH ${PROJECT_BINARY_DIR}/bin)
# 可执行文件
add_executable(hello ${SRCS})

代码

[root@cstudy hello]# # main.c
[root@cstudy hello]# cat src/main.c 
#include <stdio.h>

#include "../include/util.h"

int main() {
    int a = 1;
    int b = 2;
    printf("%d + %d = %d\n",a,b,sum(a,b));
    printf("Hello, World!\n");
    return 0;
}
[root@cstudy hello]# # util.h
[root@cstudy hello]# cat include/util.h 
#ifndef HELLO_UTIL_H
#define HELLO_UTIL_H

int sum(int a, int b );

#endif //HELLO_UTIL_H

[root@cstudy hello]# # util.c
[root@cstudy hello]# cat src/util.c 
#include "../include/util.h"

int sum(int a, int b ){
    return a + b;
}
[root@cstudy hello]# 

运行

[root@cstudy hello]# mkdir build
[root@cstudy hello]# cd build
[root@cstudy build]# cmake ..
-- The C compiler identification is GNU 4.8.5
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Configuring done
-- Generating done
-- Build files have been written to: /root/code/cmake/hello/build
[root@cstudy build]# make
Scanning dependencies of target hello
[ 33%] Building C object src/CMakeFiles/hello.dir/util.c.o
[ 66%] Building C object src/CMakeFiles/hello.dir/main.c.o
[100%] Linking C executable ../bin/hello
[100%] Built target hello
[root@cstudy build]# ./bin/hello 
1 + 2 = 3
Hello, World!
[root@cstudy build]#