[Bug c++/58201] [4.9 Regression] Undefined reference to `B::B(void const**)'

[hubicka at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58201

--- Comment #9 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Created attachment 30749
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30749&action=edit
Proposed fix.