[Bug fortran/79440] internal compiler error: in fold_convert_loc, at fold-const.c:2373

["gscfq at t-online dot de" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79440

--- Comment #4 from G. Steinmetz <gscfq@t-online.de> ---

Reduced test case from comment 0 :


$ cat z3.f90
module m
   type t
   end type
   type t2
      class(t), pointer :: a
   end type
   type, extends(t2) :: t3
   end type
   type t4
      class(t2), pointer :: b
   end type
end
program p
   use m
   type(t), target, allocatable :: y
   type(t4), allocatable :: z
   allocate (z%b, source=t3(y))
end


$ cat z4.f90
program p
   type t
   end type
   type t2
      class(t), pointer :: a
   end type
   type, extends(t2) :: t3
   end type
   type t4
      class(t2), pointer :: b
   end type
   type(t), target, allocatable :: y
   type(t4), allocatable :: z
   allocate (z%b, source=t3(y))
end


$ gfortran-9-20181111 -c z4.f90
z4.f90:14:0:

   14 |    allocate (z%b, source=t3(y))
      |
internal compiler error: in fold_convert_loc, at fold-const.c:2548
0x95f280 fold_convert_loc(unsigned int, tree_node*, tree_node*)
        ../../gcc/fold-const.c:2548
0x731cfc gfc_trans_subcomponent_assign
        ../../gcc/fortran/trans-expr.c:7642
0x732da8 gfc_trans_structure_assign(tree_node*, gfc_expr*, bool, bool)
        ../../gcc/fortran/trans-expr.c:7824
0x732462 gfc_trans_subcomponent_assign
        ../../gcc/fortran/trans-expr.c:7659
0x732da8 gfc_trans_structure_assign(tree_node*, gfc_expr*, bool, bool)
        ../../gcc/fortran/trans-expr.c:7824
0x733daa gfc_conv_structure(gfc_se*, gfc_expr*, int)
        ../../gcc/fortran/trans-expr.c:7891
0x72bc9c gfc_conv_expr(gfc_se*, gfc_expr*)
        ../../gcc/fortran/trans-expr.c:8059
0x7340e5 gfc_conv_expr_reference(gfc_se*, gfc_expr*, bool)
        ../../gcc/fortran/trans-expr.c:8184
0x77e95c gfc_trans_allocate(gfc_code*)
        ../../gcc/fortran/trans-stmt.c:5927
0x6e67a7 trans_code
        ../../gcc/fortran/trans.c:1990
0x71be1d gfc_generate_function_code(gfc_namespace*)
        ../../gcc/fortran/trans-decl.c:6509
0x699c56 translate_all_program_units
        ../../gcc/fortran/parse.c:6125
0x699c56 gfc_parse_file()
        ../../gcc/fortran/parse.c:6328
0x6e2b7f gfc_be_parse_file
        ../../gcc/fortran/f95-lang.c:204