[Bug c++/54158] [4.6, 4.7, 4.8 Regression] Silently accepts sizeof to non-static member without object in C++03 mode

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54158

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-08-02 
09:45:06 UTC ---
Ah, it was changed by a DR
(http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#613) not a C++11
proposal, so supporting it in C++03 mode is probably intentional.