http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51255
--- Comment #6 from Krisztian Kocsis <krisztian.kocsis at optimaster dot eu> 2012-04-16 14:35:37 UTC --- I currently know that glibc uses it but don't know who else use it. In my projects I always use constructor/destructor attributes because with them I can control the exection order.