http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51628
--- Comment #3 from Keith Thompson <Keith.S.Thompson at gmail dot com> 2011-12-20 00:36:52 UTC --- I see no "-Walign" option, either in the versions of gcc I'm using or in the online documentation. Were you thinking of a different option? What I'm suggesting, primarily, is that the issue should be mentioned in the documentation of the "packed" attribute (and probably of "pragma #pack" as well).
