[Bug sanitizer/64670] -fsanitize=vptr leads to "undefined reference to `typeinfo for class'"

[burnus at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64670

--- Comment #7 from Tobias Burnus <burnus at gcc dot gnu.org> ---
(In reply to Tobias Burnus from comment #6)
> Created attachment 34628 [details]
> Updated test case (part 2/2): [aux file]

Missed to state:

This file 'implements' the "class LogListener" - however, the generated .o file
contains no symbols.

Using an explicit.
  #pragma implementation
doesn't change the result.