https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64102
--- Comment #3 from ktkachov at gcc dot gnu.org --- Hmm... Trying to bootstrap 4.9 with the same configuration and -mapcs results in an ICE in stage2 when compiling haifa-sched.c $SRC/gcc/haifa-sched.c:6507:1: internal compiler error: in lra_create_copy, at lra.c:1532 } ^ 0x6f240b lra_create_copy(int, int, int) $SRC/gcc/lra.c:1532 0x70f447 process_bb_lives $SRC/gcc/lra-lives.c:568 0x710761 lra_create_live_ranges(bool) $SRC/gcc/lra-lives.c:1008 0x6f3f33 lra(_IO_FILE*) $SRC/gcc/lra.c:2372 0x6ad3a1 do_reload $SRC/gcc/ira.c:5457 0x6ad717 rest_of_handle_reload $SRC/gcc/ira.c:5598 0x6ad75f execute $SRC/gcc/ira.c:5627 Please submit a full bug report, with preprocessed source if appropriate. I didn't try without -mapcs on 4.9 though, so need to check that first.