https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69266
--- Comment #9 from tprince at computer dot org --- Trunk on 2016-01-29 is bootstrapping successfully, after dealing with the reluctance of the build to update config.cache in several directories (gcc, libcpp, libstdc++-v3, libgomp). Although I didn't see notification of how it was fixed, it looks like this PR could be closed.
