https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118891
--- Comment #5 from marcus at mc dot pp.se --- > So stage 1 compiler is miscompiling stage 2. Hm, isn't it the stage 2 compiler which is miscompiling libstdc++? It's running .../build/./gcc/xgcc, not .../build/./prev-gcc/xgcc