http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52023
--- Comment #11 from joseph at codesourcery dot com <joseph at codesourcery dot com> 2012-01-27 23:26:39 UTC --- I should add: as a matter of ABI compatibility with programs doing what stddef.h does for max_align_t (double fields using __attribute__((__aligned__(__alignof__(double)))), etc.), it probably is best to distinguish between _Alignof (least ABI alignment for a type) and __alignof__ (greatest ABI alignment for a type) here. C++11 will need examining to determine what is right for alignof there. _Alignas(type) should of course match _Alignof. _Alignof (expr) - the C11 keyword applied in the GNU extension of alignof (expr) - should continue to have the present semantics in the various special cases where the expression references a declaration, but otherwise should probably match _Alignof.
