https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86155
--- Comment #2 from RJE <rebel at ameritech dot net> --- (In reply to Jonathan Wakely from comment #1) > It works for me with a mingw-w64 build from GCC trunk, and running under > WINE. I get stage2 bootstrap errors when building official-gcc-trunk-e8005cb.tar.gz on my windows10 machine. I had no problem building gcc 8.1.1.