http://gcc.gnu.org/bugzilla/show_bug.cgi?id=7125
--- Comment #11 from Richard Purdie <richard.purdie at linuxfoundation dot org> 2012-02-06 16:23:16 UTC --- Sorry, my previous report should be disregarded as it was user error. The option does appear to work for me, removing the zlib compile where it was previously present.