[Bug bootstrap/64102] ARM bootstrap fails with segfault with -mapcs in BOOT_CFLAGS

["ktkachov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64102

--- Comment #4 from ktkachov at gcc dot gnu.org ---
(In reply to ktkachov from comment #3)
> 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.

Ah, this is a known bootstrap failure: PR 63740
so can't check whether the -mapcs issue is a regression until that's resolved