http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55061
--- Comment #19 from Ian Lance Taylor <ian at airs dot com> 2012-10-25 18:55:25 UTC --- Yes, I'm sure, because test -n "${with_target_subdir}" is true exactly when libbacktrace is being built as a target library. That test will not be true when libbacktrace is being built as a host library. And the failure you are reporting is with building libbacktrace in stage 1, when it is being built as a host library.