gdb是不是有BUG啊还是小弟我的有关问题

gdb是不是有BUG啊？还是我的问题？

C/C++ code

#include <iostream>class CTest{        public:                CTest();};CTest::CTest(void){        int x = 0;        int y = 4;        x = 23;}int main(int argc, char* argv[]){        CTest t;        return 0;}

当我用GDB跟到构造函数中时(不管断点打在哪里)，p x命令和whatis x命令都显示No symbol "x" in current context.
我编译时是肯定加了调试信息的。另外ubuntu9.04上apt装的gdb没这个问题，vs6和vs2005也没这个问题，开始以为是
版本太低，下了个gdb7.2，问题依旧，求达人解答！

[解决办法]

探讨

2楼的，多谢你的回复，不过x不是CTest的成员

[解决办法]
Missing separate debuginfos, use: debuginfo-install glibc-2.9-2.i686 libgcc-4.3.2-7.i386 libstdc++-4.3.2-7.i386
[解决办法]
编译的时候，有没有把优化关了？
用-O0精致优化。第一个是字母O,第二个是数字0
[解决办法]

探讨

考虑是被优化掉了。。。。看lz是不是用了-O参数

[解决办法]
同时我做了一个对比试验。
huer@ubuntu:~$ c++ -g test.cpp
huer@ubuntu:~$ gdb ./a.out 
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/huer/a.out...done.
(gdb) l CTest::CTest() 
4{
5 public:
6 CTest();
7};
8
9CTest::CTest(void)
10{
11 int x = 0;
12 int y = 4;
13
(gdb) l
14 x = 23;
15y = 0;
16}
17
18int main(int argc, char* argv[])
19{
20 CTest t;
21
22 return 0;
23}
(gdb) b CTest::CTest() 
Breakpoint 1 at 0x804859a: file test.cpp, line 11. (2 locations)
(gdb) r
Starting program: /home/huer/a.out 

Breakpoint 1, CTest (this=0xbffff467) at test.cpp:11
11 int x = 0;
(gdb) print x
$1 = 134514272
(gdb) n
12 int y = 4;
(gdb) print x
$2 = 0
(gdb) n
14 x = 23;
(gdb) n
15y = 0;
(gdb) print x
$3 = 23
(gdb) n
16}
(gdb) print y
No symbol "y" in current context.
(gdb) 

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