[Bug c++/51812] [4.7 regression] Virtual public inheritance and thunks leads to "undefined reference" in header files.

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51812

--- Comment #5 from Jason Merrill <jason at gcc dot gnu.org> 2012-01-23 
18:05:01 UTC ---
Patch at http://gcc.gnu.org/ml/gcc-patches/2012-01/msg01160.html