[Bug c++/54930] Add warning switch for "returning reference to temporary" and similar

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54930

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-10-15 10:24:14 UTC ---
Yep, and tests :)