https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81878
--- Comment #24 from Eric Botcazou <ebotcazou at gcc dot gnu.org> --- > This change broke the mingw-w64 GCC 8 bootstrap on Windows. The cleanup > seems a bit too aggressive as now `-B ../..` is never passed down to xg++. That shouldn't happen though, see comment #16.
