[Bug c++/51316] alignof doesn't work with arrays of unknown bound

[joseph at codesourcery dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51316

--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> 2011-11-26 23:11:11 UTC ---
Note that this usage is not valid in C1X.