https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97927
--- Comment #5 from Dominique d'Humieres <dominiq at lps dot ens.fr> --- > Dominique, are your compilers configured with --enable-checking=yes,extra,rtl > ? Only --enable-checking=yes (the default for experimental). My instrumented compiler r11-5060 also works.