http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52182
--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> 2012-02-09 17:23:59 UTC --- On Thu, 9 Feb 2012, jan.kratochvil at redhat dot com wrote: > But ISO C99 says: > A structure type describes a sequentially allocated nonempty set of member > objects (and, in certain circumstances, an incomplete array), each of which > has an optionally specified name and possibly distinct type. > ^^^^^^^^^^^^^^^^^^^^^^^^^ The name is only optional for bit-fields. See the syntax for struct-declaration and struct-declarator. The difference in C11 is that a struct-declarator-list is optional in a struct-declaration.