[Bug ipa/58678] [4.9 Regression] pykde4-4.11.2 link error (devirtualization too trigger happy)

[markus at trippelsdorf dot de]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58678

--- Comment #2 from Markus Trippelsdorf <markus at trippelsdorf dot de> ---
(In reply to Jan Hubicka from comment #1)
> Hmm, what prevents us from devirtualizing here? It seems to be bug to
> include a class without linking with its implementation..

In this case the implementation is linked in, but the symbol
is only local.

 # nm /usr/lib64/libphonon.so.4.6.0 | c++filt | grep "vtable for
Phonon::BackendCapabilities::Notifier"
0000000000066380 d vtable for Phonon::BackendCapabilities::Notifier