[Bug fortran/105379] New: [12 Regression] ICE in gfc_compare_array_spec(): Array spec clobbered

["gscfq@t-online.de" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105379

            Bug ID: 105379
           Summary: [12 Regression] ICE in gfc_compare_array_spec(): Array
                    spec clobbered
           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: ---

Started between 20220417 and 20220424 :


$ cat z1.f90
program p
   type t
   end type
contains
   subroutine s1(x)
      class(t) :: x(3)
   end
   subroutine s2(n, x)
      integer :: n
      class(t) :: x(n)
   end
end


$ cat z2.f90
program p
   type t
   end type
   integer :: m = 3
contains
   subroutine s1(x)
      class(t) :: x(3)
   end
   subroutine s3(x)
      class(t) :: x(m)
   end
end


$ gfortran-12-20220424 -c z1.f90
f951: internal compiler error: gfc_compare_array_spec(): Array spec clobbered
0x6f15b9 gfc_report_diagnostic
        ../../gcc/fortran/error.cc:883
0x6f3137 gfc_internal_error(char const*, ...)
        ../../gcc/fortran/error.cc:1503
0x6be47f compare_bounds
        ../../gcc/fortran/array.cc:971
0x6bfde3 gfc_compare_array_spec(gfc_array_spec*, gfc_array_spec*)
        ../../gcc/fortran/array.cc:1012
0x6ff3dc compare_components
        ../../gcc/fortran/interface.cc:495
0x6ff6d0 gfc_compare_derived_types(gfc_symbol*, gfc_symbol*)
        ../../gcc/fortran/interface.cc:678
0x834de8 gfc_copy_dt_decls_ifequal(gfc_symbol*, gfc_symbol*, bool)
        ../../gcc/fortran/trans-types.cc:2453
0x8342c4 gfc_get_derived_type(gfc_symbol*, int)
        ../../gcc/fortran/trans-types.cc:2922
0x834d18 gfc_typenode_for_spec(gfc_typespec*, int)
        ../../gcc/fortran/trans-types.cc:1195
0x834f78 gfc_sym_type(gfc_symbol*, bool)
        ../../gcc/fortran/trans-types.cc:2307
0x83344f gfc_get_function_type(gfc_symbol*, gfc_actual_arglist*, char const*)
        ../../gcc/fortran/trans-types.cc:3161
0x7c7424 build_function_decl
        ../../gcc/fortran/trans-decl.cc:2393
0x7cf3a6 gfc_create_function_decl(gfc_namespace*, bool)
        ../../gcc/fortran/trans-decl.cc:3102
0x7d48be gfc_generate_contained_functions
        ../../gcc/fortran/trans-decl.cc:5768
0x7d48be gfc_generate_function_code(gfc_namespace*)
        ../../gcc/fortran/trans-decl.cc:7586
0x75700e translate_all_program_units
        ../../gcc/fortran/parse.cc:6669
0x75700e gfc_parse_file()
        ../../gcc/fortran/parse.cc:6956
0x7a44af gfc_be_parse_file
        ../../gcc/fortran/f95-lang.cc:216