第五周：C语言 编译过程，GDB调试， Make 等

basketball610

1. C                          GCC
预处理                    gcc -E
编译                       gcc -E        hello.c >> hello.i
汇编                       gcc -S hello.i -> hello.s
                              gcc -c hello.s -> hello.o
链接                       gcc -o hello hello.o
.exe
.out

gcc -O 优化
gcc -Wall
gcc -g   调试


2. GDB

gcc *.c -g( -g3)
gdb ./a.out

命令
(gdb) list  
(gdb) ctrl + l
(gdb) l 1                 从第1行开始显示
(gdb)l 20               显示15 ～25行代码

设置短点：
(gdb) b 42              设置第42行为断点
(gdb) info b             显示设置过的断点位置
(gdb) r                    开始运行
(gdb) display i       显示变量
(gdb) n                    下一步，不进入函数内部
(gdb)step               下一步，进入函数内部
(gdb) c                   从当前位置直接跳到下一个断点位置（或结尾）





３. Make file

main.c                                                     tool1.c                                      tool2.c
   |                                                                 |                                                 |
   |                                                                 |                                                 |
   |                                                                 |                                                 |
  V                                                                V                                                V
main.o                                                    tool1.o                                       tool2.o
  |                                                                  |                                                 |
 ----------------------------------------------------a.out------------------------------------


4.写个Makefile:

mytool:main.o tool1.o tool2.o
    gcc main.o tool1.o tool2.o -o mytool

main.o:main.c
    gcc -Wall -g -O -c main.c -o main.o
tool1.o:tool1.c
    gcc -Wall -g -O -c tool1.c -o tool1.o
tool2.o:tool2.c
    gcc -Wall -g -O -c tool2.c -o tool2.o

clean:
    rm -f *.o mytool

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