http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46031
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2010-10-15 05:08:00 UTC --- I don't think the atomics page should reference a target specific option. I think the following sentence makes that clear that the builtins are dependent on target options as they can change what the target processor is: Not all operations are supported by all target processors.