[系统运维]Linux makefile和make

makefile和make

管理工程 实现自动化编译 (和 vs 比较)示例：
对 main.c add.c max.c 三个文件进行编译(注意: gcc 前面必须是 table键缩进)
1.编写makefile文件

wys@DESKTOP-2OU3HRV:~/mycode/day02$ vim makefile

  1 all : main
  2
  3 main: main.o add.o max.o
  4     gcc -o main main.o add.o max.o
  5
  6 main.o: main.c
  7     gcc -c main.c
  8
  9 add.o : add.c
 10     gcc -c add.c
 11
 12 max.o : max.c
 13     gcc -c max.c
 14
 15 clean:
 16     rm -f *.o main
 17    

wys@DESKTOP-2OU3HRV:~/mycode/day02$ ls
add.c  add.h  main.c  makefile  max.c  max.h
wys@DESKTOP-2OU3HRV:~/mycode/day02$

2.make 命令根据 makefile 文件的规则生成可执行程序

wys@DESKTOP-2OU3HRV:~/mycode/day02$ ls
add.c  add.h  main.c  makefile  max.c  max.h
wys@DESKTOP-2OU3HRV:~/mycode/day02$ make
gcc -c main.c
gcc -c add.c
gcc -c max.c
gcc -o main main.o add.o max.o
wys@DESKTOP-2OU3HRV:~/mycode/day02$ ls
add.c  add.h  add.o  main  main.c  main.o  makefile  max.c  max.h  max.o
wys@DESKTOP-2OU3HRV:~/mycode/day02$ ./main
a + b=5
max=5
wys@DESKTOP-2OU3HRV:~/mycode/day02$