http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50602
--- Comment #17 from Andi Kleen <andi-gcc at firstfloor dot org> 2012-05-03 14:57:13 UTC --- Hmm, my assumption was always that this option would be passed through and then used by lto1 step. That's true for other -f* options at least.