http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21998
--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> 2013-03-27 11:32:19 UTC --- Note that the concern is also that a1 may be mapped to a read-only segment, so introducing a store data-race may trap. That's probably out of the C99 language standards scope, but the middle-end has to care about this possibility.
