[Bug python/27021] Python Exception <class 'AttributeError'> 'NoneType' object has no attribute 'pointer': when using pretty-printer

["ppluzhnikov at google dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27021

--- Comment #2 from Paul Pluzhnikov <ppluzhnikov at google dot com> ---
There is a very similar failure when the current frame is in the correct ELF
image, but has the "wrong" language:

--- main.cc ---
#include <map>

extern "C" int foo();
static std::map<int, int> foo_map;

int main()
{
  foo_map[1] = 10;
  foo_map[2] = 20;
  return foo();
}

--- foo.c --- // Note: plain "C"
#include <stdlib.h>

int foo() { abort(); }


gcc -g -c foo.c && g++ -g main.cc foo.o && ./a.out
gdb ./a.out core

GNU gdb (GDB) 11.0.50.20201205-git
...
Reading symbols from a.out...
[New LWP 228379]
Core was generated by `./a.out'.
Program terminated with signal SIGABRT, Aborted.
#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
50      ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) up
#1  0x00007fb556b98537 in __GI_abort () at abort.c:79
79      abort.c: No such file or directory.
(gdb)
#2  0x000055732abe9942 in foo () at foo.c:3
3       int foo() { abort(); }
(gdb) p foo_map
Python Exception <type 'exceptions.AttributeError'> 'NoneType' object has no
attribute 'pointer':
$1 = std::map with 2 elements

(gdb) info symbol foo
foo in section .text of /tmp/a.out

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