用于调试stdlib变量的Python漂亮打印机无法正常工作

Question

我按照这篇文章很好地调试了变量。eclipse mars
CDT中没有出现字符串的值

但是我最终收到如下错误消息：

 File "/usr/share/gdb/auto-load/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19-gdb.py", line 63, in <module>
    from libstdcxx.v6.printers import register_libstdcxx_printers
ImportError: No module named 'libstdcxx'

我该如何解决这个问题？

Answer 1

您.gdbinit的内容似乎不正确，或者没有运行。

确保添加的路径对于您的机器是正确的，并且gdbinit文件正在运行。

由于您遇到了该错误，因此只需要向python添加正确的路径即可。

这是一个示例跟踪，它首先不起作用，然后在更正路径后才起作用：

$ cat hello.cc 
#include <string>
using namespace std;

int main() {
    string mystring = "my string here";
    return 0;
}

$ g++ hello.cc -g -o hello.elf

$ gdb hello.elf --quiet

Reading symbols from hello.elf...done.
(gdb) b hello.cc:6
Breakpoint 1 at 0x400863: file hello.cc, line 6.
(gdb) r
Starting program: /tmp/x/hello.elf 
Traceback (most recent call last):
  File "/usr/share/gdb/auto-load/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19-gdb.py", line 63, in <module>
    from libstdcxx.v6.printers import register_libstdcxx_printers
ImportError: No module named 'libstdcxx'

Breakpoint 1, main () at hello.cc:6
6       return 0;
(gdb) p mystring
$1 = {static npos = <optimised out>, _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
    _M_p = 0x602028 "my string here"}}
(gdb) python
>import sys
>sys.path.insert(0, '/usr/share/gcc-4.8/python/')
>end
(gdb) r
The program being debugged has been started already.
Start it from the beginning? (y or n) y
Starting program: /tmp/x/hello.elf

Breakpoint 1, main () at hello.cc:6
6       return 0;
(gdb) p mystring
$2 = "my string here"
(gdb)

以上示例的版本信息：

$ g++ --version
g++ (Ubuntu 4.8.4-2ubuntu1~14.04) 4.8.4
Copyright (C) 2013 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$ gdb --version
GNU gdb (Ubuntu 7.7.1-0ubuntu5~14.04.2) 7.7.1
Copyright (C) 2014 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 "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word".

使用Eclipse CDT时

使用Eclipse CDT时，您需要手动指定gdbinit文件。Eclipse CDT使用该--nx标志启动GDB
，这将阻止GDB.gdbinit自动拾取任何文件。您应该在启动配置中指定CDT合适的初始化文件：

此外，您可以在“首选项”中为新的启动配置更改默认的启动gdbinit，如下图所示：