2.73 如何判断GDB已经启用Python支持

https://scz.617.cn/unix/202103091316.txt

A:

(gdb) show version
GNU gdb (Debian 10.1-1.7) 10.1.90.20210103-git
...

(gdb) show configuration
This GDB was configured as follows:
   configure --host=i686-linux-gnu --target=i686-linux-gnu
...
             --with-python=/usr (relocatable)
             --with-python-libdir=/usr/lib (relocatable)
...

若有如上内容，表明编译生成GDB时已经启用Python支持。此时GDB有一些基于Python
的内置函数:

(gdb) help function
...
function _memeq -- $_memeq - compare bytes of memory.
function _regex -- $_regex - check if a string matches a regular expression.
function _streq -- $_streq - check string equality.
function _strlen -- $_strlen - compute string length.
...

GDB有个python/py命令:

(gdb) help python
python, py
Evaluate a Python command.

The command can be given as an argument, for instance:

    python print (23)

If no argument is given, the following lines are read and used
as the Python commands.  Type a line containing "end" to indicate
the end of the command.

(gdb) python print(True)
True

(gdb) python import sys;print(sys.version)
(gdb) python print(sys.version)
3.9.1+ (default, Jan 20 2021, 14:49:22) 
[GCC 10.2.1 20210110]