[Bug ipa/62051] [9/10/11/12 Regression] Undefined reference to vtable with -O2 and -fdevirtualize-speculatively

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62051

--- Comment #27 from Jason Merrill <jason at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #26)
> That is Base and Derived in the shared library and the main program are
> considered two different classes because of -fvisibility=hidden and the
> classes are not marked as visibility default.

Symbol visibility is outside the language, and doesn't affect mangling, so I
don't think it's accurate to say they are considered two different classes.  It
seems to me they are the same classes, with controlled access to the
implementation.