Comment 0 for bug 2041396

GDB 12.1 had a regression where it will break program execution when the program contains mixed ARM code and THUMB code.

Considering the following C program:

```
__attribute__((target("arm"), noinline))
int thumb_func() {
  return 42;
}

__attribute__((target("thumb")))
int main() { return thumb_func(); }
```

If you build it using `gcc repro.c -ggdb3 -Og -o repro` and run the GDB using the following commands:

```
b 3
r
c
```

(you can save it to a file and run GDB using `gdb -x script ./repro`)

You will notice GDB broke the program and threw SIGILL.
If you run the program without GDB, the program exits normally.

This bug has been fixed in GDB 13, but the fix was never backported to GDB 12. You can find the upstream bug in the remote bug watch.