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Is that a GDB bug?
- From: Nancy <nancydreaming at gmail dot com>
- To: gdb at sourceware dot org
- Date: Mon, 12 Oct 2015 20:46:00 +0800
- Subject: Is that a GDB bug?
- Authentication-results: sourceware.org; auth=none
Hi,
Why line 5 execute twice? Is that a GDB bug?
debug.c :
1 int main()
2 {
3 int x;
4 x=0;
5 L1: switch(x) { case 0: x=1; goto L1; case 1: if(x==0)
goto L1; else break; }
6 x=2;
7 }
$ gcc -O0 -g debug.c -o debug
$ gdb debug
GNU gdb (Ubuntu 7.7.1-0ubuntu5~14.04.2) 7.7.1
Copyright (C) 2014 Free Software Foundation, Inc.
....................
Reading symbols from debug...done.
(gdb) b 5
Breakpoint 1 at 0x80483fa: file debug.c, line 5.
(gdb) r
Starting program: /mnt/hgfs/cygwin/tmp/debug
Breakpoint 1, main () at debug.c:5
5 L1: switch(x) { case 0: x=1; goto L1; case 1: if(x==0) goto
L1; else break; }
(gdb) n
Breakpoint 1, main () at debug.c:5
5 L1: switch(x) { case 0: x=1; goto L1; case 1: if(x==0) goto
L1; else break; }
(gdb) n
6 x=2;
--
Best Regards,
Yu Rong Tan