http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60833
--- Comment #1 from Mark Wielaard <mark at gcc dot gnu.org> --- Confirmed with GNU C++ 4.10.0 20140417 (experimental). GCC doesn't emit the typedef for tbase because it is unused. It will emit the typedef for tbase when it is used for a variable like tbase y. But even then it will optimize out the typedef from the inherentence tree and make the DW_TAG_inherentence tag DW_AT_type attribute of the derived struct DIE point directly to the struct base type DIE.
