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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug sanitizer/64670] -fsanitize=vptr leads to "undefined reference to `typeinfo for class'"
Date: Mon, 09 Feb 2015 16:42:00 -0000
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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.