shell脚本编程Makefile的使用

hello_demo : hellospeak.o speak.o   //由hellospeak.o speak.o链接成目标hello_demo                                  
        gcc -o hello_demo hellospeak.o speak.o  //执行下面的命令                               

hellospeak.o : hellospeak.c speak.h  //如果一些hellospeak.c的函数声明是在头文件speak.h中那么也得在这后面加上                                         
        gcc -c hellospeak.c                                                
speak.o : speak.c  speak.h                                                  
        gcc -c speak.c                                                    
clean :                                                                  
        rm hello_demo speak.o  hellospeak.o  //当执行make clean时就会执行这个语句 

//speak.h
#include<stdio.h>
#include<stdlib.h>
void helloSpeak();
--------------------------------------------------------------




//speak.c
#include"speak.h"
void helloSpeak()
{
 printf("Hello Makefile\n");
}
--------------------------------------------------------------




//main.c
#include"speak.h"
int main()
{
  helloSpeak();
  return 0;
}



--------------------------------------------------------------
//Makefile
Hello: main.o speak.o
        gcc -o Hello  main.o speak.o
main.o: main.c speak.h
        gcc -c main.c
speak.o: speak.c speak.h
        gcc -c speak.c
clean:
        rm Hello speak.o main.o

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