http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55403
--- Comment #5 from Richard Henderson <rth at gcc dot gnu.org> 2012-11-20 16:34:20 UTC --- I now suspect you're missing --with-long-double-128, which would have been auto-detected given alpha glibc headers in --with-sysroot, as I have. Proposed patch here: http://gcc.gnu.org/ml/gcc-patches/2012-11/msg01681.html
