http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47785
--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-11-02 15:01:09 UTC --- For this to be fixed we'd need something similar to COLLECT_GCC_OPTIONS, COLLECT_AS_OPTIONS for example, and lto-wrapper passing those on via -Wa to the link-time driver.