c++ - GDB:在头文件中的模板类函数中设置断点时出错

Question

我使用了两个不同版本的 GDB，都在以下代码中出现问题:

MyFile.h 中的精简代码:

template<class T>
struct ABC: PQR<T> {
  void flow(PP pp) {
    const QX qx = XYZ<Z>::foo(pp); // Trying to set a breakpoint here, line no. 2533
    ASSERTp(qx >= last_qx());
   }
}

GDB 7.1:

Reading symbols from /path_to_exec/exec...done.
(gdb) break MyFile.h:2533
Note: breakpoint 1 also set at pc 0x121.
Note: breakpoint 1 also set at pc 0x121.
Note: breakpoint 1 also set at pc 0x121.
Note: breakpoint 1 also set at pc 0x156.
Note: breakpoint 1 also set at pc 0x156.
Note: breakpoint 1 also set at pc 0x121.
Note: breakpoint 1 also set at pc 0x121.
Note: breakpoint 1 also set at pc 0x121.
Note: breakpoint 1 also set at pc 0x121.
Note: breakpoint 1 also set at pc 0x121.
Note: breakpoint 1 also set at pc 0x121.
Note: breakpoint 1 also set at pc 0x156.
Note: breakpoint 1 also set at pc 0x156.
Note: breakpoint 1 also set at pc 0x121.
Breakpoint 1 at 0x44e5c4: file PacketEngine.h, line 2533. (23 locations)
(gdb) run
Starting program: /path_to_exec/exec -options
Warning:
Cannot insert breakpoint 1.
Error accessing memory address 0x121: Input/output error.
Cannot insert breakpoint 1.
Error accessing memory address 0x156: Input/output error.

为什么要为一个设置23个断点？再往下，它在 run

上出错

GDB 6.3:

 This GDB was configured as "x86_64-redhat-linux-gnu"...Using host libthread_db library "/lib64/tls/libthread_db.so.1".

(gdb) break MyFile.h:2533
No line 2533 in file "MyFile.h".

在程序开始时，它甚至不接受断点 如果我中断函数 ASSERTp，它就会中断。然后。如果我转到“UP”并键入 break，它会成功插入断点 (break MyFile.h:2533)。 [因此它以某种方式在程序实际运行后找到文件/行]。 但是，尽管设置了断点，但在重新运行程序时它不会在第 2533 行停止，而只会在第 2534 行停止(函数 ASSERTp 中的断点)。

我的问题:

1) 有人可以帮我解决这个问题吗？

2) 我经常遇到模板代码和 GDB 的问题。是否有任何好的和免费的模板 C++ 调试器？

3) 不是很重要，但如果重要的话，还有一个附带问题:哪个版本更可取？ 7.1 似乎有更多错误，但我记得在某些运行中，它出现的问题较少。

---

系统信息:

uname -a
Linux ... 2.6.9-67.ELsmp #1 SMP Fri Nov 16 12:49:06 EST 2007 x86_64 x86_64 x86_64 GNU/Linux

file /usr/bin/gdb   #### GDB 6.3
/usr/bin/gdb: ELF 64-bit LSB executable, AMD x86-64, version 1 (SYSV), for GNU/Linux 2.4.0, dynamically linked (uses shared libs), stripped

file ~/local/bin/gdb  #### GDB 7.1
/home/user/local/bin/gdb: ELF 64-bit LSB executable, AMD x86-64, version 1 (SYSV), for GNU/Linux 2.4.0, dynamically linked (uses shared libs), not stripped

file /path_to_exec/exec
/path_to_exec/exec: ELF 64-bit LSB executable, AMD x86-64, version 1 (SYSV), for GNU/Linux 2.4.0, dynamically linked (uses shared libs), not stripped

Answer 1

我不是任何其他 linux 调试器，但我从未遇到过您所解释的此类问题。

您的问题表述得非常好(您可能做到了)，但是您是否使用调试符号编译了源代码？

编辑

顺便说一句，我还没有尝试过 gdb 7.1 - 只有 6.8 版本。如果您认为它非常有问题，请尝试使用 6 版本的最新版本。