http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52023
--- Comment #9 from bruno at clisp dot org 2012-01-27 22:39:01 UTC --- (In reply to comment #7) > What happens if you have the attribute packed on the structure? Attribute 'packed' is outside the scope of ISO C11. We're discussing ISO C11 compliant programs here. ISO C11 has the _Alignas keyword, with which a stricter alignment can be requested (ISO C11 6.2.8.(1), 6.7.5.(4)), but not a less strict alignment. GCC's __alignof__ that returns the *preferred* alignment of an object of the given type has its uses (in memory allocators for example). But the semantics imposed by ISO C11 on the 'alignof' and '_Alignof' operators defined through <stdalign.h> is address boundary requirement for all "objects" of that type, not the preferred alignment.
