linux-c/c++调试利器gdb、ddd小试

一、gdb，在shell窗口调试

main.c内容：

main.c

#include <stdio.h>

int main() 

{

int y=0;

for (int i=0;i<10;i++){

   y+=i;

}

return 0;

}

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编译：

 

deepfuture@deepfuture-desktop:~/test$ gcc -ggdb -std=c99 -o main main.c

 

启动gdb

1、gdb 执行文件名

 

deepfuture@deepfuture-desktop:~/test$ gdb main

GNU gdb (GDB) 7.1-ubuntu

Copyright (C) 2010 Free Software Foundation, Inc.

License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>

This is free software: you are free to change and redistribute it.

There is NO WARRANTY, to the extent permitted by law.  Type "show copying"

and "show warranty" for details.

This GDB was configured as "i486-linux-gnu".

For bug reporting instructions, please see:

<http://www.gnu.org/software/gdb/bugs/>...

Reading symbols from /home/deepfuture/test/main...done.

２、list为列出源代码

(gdb) list

1

2 #include <stdio.h>

3 int main() 

4 {

5 int y=0;

6 for (int i=0;i<10;i++){

7   y+=i;

8 }

9 return 0;

10 }

３、运行

(gdb) run

Starting program: /home/deepfuture/test/main 

Program exited normally.

4、退出gdb

(gdb) quit

5、启动gdb后，再设置要加载的文件

(gdb) file main

Reading symbols from /home/deepfuture/test/main...done.

6、设置断点,，使用break行号

(gdb) list

warning: Source file is more recent than executable.

1

2 #include <stdio.h>

3 int main() 

4 {

5 int y=0;

6 for (int i=0;i<10;i++){

7   y+=i;

8 }

9 return 0;

10 }

(gdb) break 7

Breakpoint 1 at 0x80483ca: file main.c, line 7.

７、运行,run

(gdb) run

Starting program: /home/deepfuture/test/main 

Breakpoint 1, main () at main.c:7

7   y+=i;

8、离开这个断点，继续运行

(gdb) c

Continuing.

9、监视变量

(gdb) watch y

Hardware watchpoint 2: y

１０、检查变量变化

(gdb) c

Continuing.

Hardware watchpoint 2: y

Old value = 1

New value = 3

main () at main.c:6

6 for (int i=0;i<10;i++){

(gdb) c

Continuing.

Breakpoint 1, main () at main.c:7

7   y+=i;

(gdb) c

Continuing.

Hardware watchpoint 2: y

Old value = 3

New value = 6

main () at main.c:6

6 for (int i=0;i<10;i++){

二、ddd，使用

可以在选择行或某变量后，watch,break等按钮，很方便

右中部的面板是一些流程调试

 图形方式调试