[Bug fortran/78719] New: ICE in gfc_get_symbol_decl, at fortran/trans-decl.c:1438

[gerhard.steinmetz.fortran@t-online.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78719

            Bug ID: 78719
           Summary: ICE in gfc_get_symbol_decl, at
                    fortran/trans-decl.c:1438
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gerhard.steinmetz.fortran@t-online.de
  Target Milestone: ---

With invalid code (due to an extra declaration flagged with "!!"),
down to at least 4.8 :


$ cat z1.f90
program p
   type t
      integer :: n
   end type
   class(t) :: g   !!
   abstract interface
      subroutine h
      end
   end interface
   procedure(h), pointer :: s
   s => f
   call s
   s => g
   call s
contains
   subroutine f
      print *, 'inside f'
   end
   subroutine g
      print *, 'inside g'
   end
end


$ gfortran-7-20161204 z1.f90
z1.f90:13:0:

    s => g

internal compiler error: Segmentation fault
0xc4940f crash_signal
        ../../gcc/toplev.c:333
0x75a0e9 gfc_get_symbol_decl(gfc_symbol*)
        ../../gcc/fortran/trans-decl.c:1438
0x7731af gfc_conv_variable
        ../../gcc/fortran/trans-expr.c:2494
0x76ee42 gfc_conv_expr(gfc_se*, gfc_expr*)
        ../../gcc/fortran/trans-expr.c:7771
0x77bc97 gfc_trans_pointer_assignment(gfc_expr*, gfc_expr*)
        ../../gcc/fortran/trans-expr.c:8169
0x72e667 trans_code
        ../../gcc/fortran/trans.c:1798
0x75f708 gfc_generate_function_code(gfc_namespace*)
        ../../gcc/fortran/trans-decl.c:6271
0x6e73d0 translate_all_program_units
        ../../gcc/fortran/parse.c:6038
0x6e73d0 gfc_parse_file()
        ../../gcc/fortran/parse.c:6238
0x72b182 gfc_be_parse_file
        ../../gcc/fortran/f95-lang.c:202