[Bug fortran/100949] New: [9/10/11/12 Regression] ICE in gfc_conv_expr_present, at fortran/trans-expr.c:1975

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100949

            Bug ID: 100949
           Summary: [9/10/11/12 Regression] ICE in gfc_conv_expr_present,
                    at fortran/trans-expr.c:1975
           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 with r7 (before 20180426) :


$ cat z1.f90
subroutine s
entry f
   type t
   end type
   class(t), allocatable :: y, z
   allocate (z, mold=y)
end


$ gfortran-6 -c z1.f90
$
$ gfortran-12-20210606 -c z1.f90
z1.f90:6:23:

    6 |    allocate (z, mold=y)
      |                       1
internal compiler error: in gfc_conv_expr_present, at fortran/trans-expr.c:1975
0x7c8560 gfc_conv_expr_present(gfc_symbol*, bool)
        ../../gcc/fortran/trans-expr.c:1975
0x7ce34a gfc_trans_class_init_assign(gfc_code*)
        ../../gcc/fortran/trans-expr.c:1747
0x817477 gfc_trans_allocate(gfc_code*)
        ../../gcc/fortran/trans-stmt.c:7049
0x79e617 trans_code
        ../../gcc/fortran/trans.c:2090
0x7c4bc4 gfc_generate_function_code(gfc_namespace*)
        ../../gcc/fortran/trans-decl.c:6893
0x74b3f6 translate_all_program_units
        ../../gcc/fortran/parse.c:6461
0x74b3f6 gfc_parse_file()
        ../../gcc/fortran/parse.c:6730
0x79772f gfc_be_parse_file
        ../../gcc/fortran/f95-lang.c:212