http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50266
--- Comment #3 from joseph at codesourcery dot com <joseph at codesourcery dot com> 2011-09-02 13:36:20 UTC --- I don't think there's any particular reason this initializer should need to be folded in a particular way by the front end; I'd think the front end's job is to produce a valid GENERIC initializer, whether or not folded, with folding to something visibly constant only required if the object initialized is of static storage duration. If you make x static then it builds OK (although it's not required to) but in C99 an aggregate initializer of automatic storage duration can have non-constant elements even if the type of the aggregate is a const-qualified type (that is, x is initialized once and constant after that). In fact you get the same ICE when x isn't marked const at all. (And in general the middle-end ought to be prepared to see aggregate initializers that become constant after constant propagation but aren't known by the front end to be constant.)
