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创建三个文件：test.c、add.c、add.h。对比step-mode 模式的差别。

test.c文件代码展示如下：

#include <stdio.h>
#include "add.h"
int main(void)
{
     int a = 10;
     int b = 20;
     int c = add(20,10);
     printf("%d\n",c);
     return 0;
}

add.c文件代码展示如下：

#include <stdio.h>
#include "add.h"
int add(int a,int b)
{
 return a + b;
}

add.h文件代码展示如下：

#ifndef ADD_H__
#define ADD_H__

int add(int a, int b);

#endif

编译文件：

gcc -c -g test.c
gcc -c add.c
gcc test.o add.o -o test

进入调试文件：

gdb test

使用step-mode调试程序

(gdb) show step-mode
Mode of the step operation is off.

(gdb) run
Starting program: /home/wjc/test2/test
Breakpoint 1, main () at test.c:9

(gdb) s
9  int c = add(20,10);

(gdb) s
10  printf("%d\n",c);

(gdb) c
Continuing.
30
[Inferior 1 (process 3423) exited normally] (gdb) set step-mode on

(gdb) run
Starting program: /home/wjc/test2/test
Breakpoint 1, main () at test.c:9

(gdb) s
9  int c = add(20,10);

(gdb) s
0x000055555555468f in add ()

(gdb) c
Continuing.
30
[Inferior 1 (process 3424) exited normally]