[Bug fortran/103284] New: ICE in get_unique_type_string, at fortran/class.c:502

[Bug fortran/103284] New: ICE in get_unique_type_string, at fortran/class.c:502

[gscfq@t-online.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103284

            Bug ID: 103284
           Summary: ICE in get_unique_type_string, at fortran/class.c:502
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gscfq@t-online.de
  Target Milestone: ---

Affects versions down to at least r5, with a missing
attribute allocatable or pointer (follow-up of pr95980) :


$ cat z1.f90
program p
   type t
      character :: c
   end type
   class(t) :: x
   select type (y => x)
   end select
end


$ gfortran-12-20211114 -c z1.f90
f951: internal compiler error: Segmentation fault
0xd5dbdf crash_signal
        ../../gcc/toplev.c:322
0x773317 get_unique_type_string
        ../../gcc/fortran/class.c:502
0x773d01 get_unique_hashed_string
        ../../gcc/fortran/class.c:524
0x7771a9 gfc_build_class_symbol(gfc_typespec*, symbol_attribute*,
gfc_array_spec**)
        ../../gcc/fortran/class.c:666
0x7cf373 gfc_match_select_type()
        ../../gcc/fortran/match.c:6433
0x7f35f4 match_word
        ../../gcc/fortran/parse.c:67
0x7f35f4 decode_statement
        ../../gcc/fortran/parse.c:430
0x7f4e2a next_free
        ../../gcc/fortran/parse.c:1397
0x7f4e2a next_statement
        ../../gcc/fortran/parse.c:1629
0x7f654b parse_spec
        ../../gcc/fortran/parse.c:4168
0x7f98ac parse_progunit
        ../../gcc/fortran/parse.c:6179
0x7fab91 gfc_parse_file()
        ../../gcc/fortran/parse.c:6724
0x84806f gfc_be_parse_file
        ../../gcc/fortran/f95-lang.c:216