http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51159
--- Comment #2 from sebastian.heg...@tu-dresden.de 2011-11-17 10:44:33 UTC --- Fixed in trunk r173723, not fixed in gcc-4.6-branch. "--enable-build-with-cxx" is an officially supported build option, so it should work reliably in releases.