[Bug fortran/85877] New: [6/7/8/9 Regression] ICE in fold_convert_loc, at fold-const.c:2449

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85877

            Bug ID: 85877
           Summary: [6/7/8/9 Regression] ICE in fold_convert_loc, at
                    fold-const.c:2449
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gscfq@t-online.de
  Target Milestone: ---

Down to version 4.9, gfortran-4.8 compiles this :

$ cat z1.f90
program p
   bind(c) f
   x = f()
end


$ gfortran-4.8 -c z1.f90
$
$ gfortran-9-20180520 -c z1.f90
z1.f90:3:0:

    x = f()

internal compiler error: in fold_convert_loc, at fold-const.c:2449
0x928f83 fold_convert_loc(unsigned int, tree_node*, tree_node*)
        ../../gcc/fold-const.c:2449
0x7783cc gfc_trans_scalar_assign(gfc_se*, gfc_se*, gfc_typespec, bool, bool,
bool)
        ../../gcc/fortran/trans-expr.c:8959
0x786d69 gfc_trans_assignment_1
        ../../gcc/fortran/trans-expr.c:10264
0x74aef7 trans_code
        ../../gcc/fortran/trans.c:1828
0x772219 gfc_generate_function_code(gfc_namespace*)
        ../../gcc/fortran/trans-decl.c:6507
0x7012a0 translate_all_program_units
        ../../gcc/fortran/parse.c:6121
0x7012a0 gfc_parse_file()
        ../../gcc/fortran/parse.c:6324
0x74809f gfc_be_parse_file
        ../../gcc/fortran/f95-lang.c:204