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Subject: [Bug fortran/104555] New: ICE in gfc_compare_derived_types, at
 fortran/interface.cc:628
Date: Tue, 15 Feb 2022 19:40:37 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104555

            Bug ID: 104555
           Summary: ICE in gfc_compare_derived_types, at
                    fortran/interface.cc:628
           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: ---

Starts with r10, changed between 20190825 and 20190901 :


$ cat z1.f90
program p
   type t
      character(:), allocatable :: a
   end type
contains
   subroutine s(x)
      class(t) :: x(..)
      select rank (x)
      rank (1)
         select type (y =3D> x)
         type is (t)
         end select
      end select
   end
end


$ gfortran-12-20220213 -c z1.f90
f951: internal compiler error: Segmentation fault
0xcc8a9f crash_signal
        ../../gcc/toplev.cc:322
0x6fbdbc gfc_compare_derived_types(gfc_symbol*, gfc_symbol*)
        ../../gcc/fortran/interface.cc:628
0x792efe gfc_type_is_extension_of(gfc_symbol*, gfc_symbol*)
        ../../gcc/fortran/symbol.cc:5116
0x77373c resolve_select_type
        ../../gcc/fortran/resolve.cc:9451
0x768b23 gfc_resolve_code(gfc_code*, gfc_namespace*)
        ../../gcc/fortran/resolve.cc:12173
0x76ab87 resolve_codes
        ../../gcc/fortran/resolve.cc:17536
0x76ac4e gfc_resolve(gfc_namespace*)
        ../../gcc/fortran/resolve.cc:17571
0x768c99 gfc_resolve(gfc_namespace*)
        ../../gcc/fortran/resolve.cc:17556
0x768c99 resolve_block_construct
        ../../gcc/fortran/resolve.cc:10791
0x768c99 gfc_resolve_code(gfc_code*, gfc_namespace*)
        ../../gcc/fortran/resolve.cc:12181
0x767eef gfc_resolve_blocks(gfc_code*, gfc_namespace*)
        ../../gcc/fortran/resolve.cc:10943
0x769edf resolve_select_rank
        ../../gcc/fortran/resolve.cc:9953
0x769edf gfc_resolve_code(gfc_code*, gfc_namespace*)
        ../../gcc/fortran/resolve.cc:12177
0x76ab87 resolve_codes
        ../../gcc/fortran/resolve.cc:17536
0x76aabe resolve_codes
        ../../gcc/fortran/resolve.cc:17519
0x76ac4e gfc_resolve(gfc_namespace*)
        ../../gcc/fortran/resolve.cc:17571
0x752f74 resolve_all_program_units
        ../../gcc/fortran/parse.cc:6586
0x752f74 gfc_parse_file()
        ../../gcc/fortran/parse.cc:6842
0x7a066f gfc_be_parse_file
        ../../gcc/fortran/f95-lang.cc:216=