https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111642
--- Comment #10 from Arsen Arsenović <arsen at gcc dot gnu.org> --- ah, yeah, seems that the common thread is checking. my system compiler is built with --enable-checking=yes,extra,rtl. 'make -j17 CXXFLAGS=-fno-checking' also seems to work around it