https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68631
--- Comment #2 from Hubert Jarosz <marqin.pl+gcc at gmail dot com> --- This GCC was built with 3 stage bootstraping from tarball posted by Richard Biener on GCC maillist: https://gcc.gnu.org/ml/gcc/2015-11/msg00210.html
