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From: "pault at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/98408] Character lengths for allocatable character arrays
Date: Mon, 21 Dec 2020 10:33:51 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98408

Paul Thomas <pault at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pault at gcc dot gnu.org

--- Comment #1 from Paul Thomas <pault at gcc dot gnu.org> ---
Hi Thomas,

>>From gfc_conv_intrinsic_sizeof:

      if (arg->ts.type =3D=3D BT_CHARACTER)
        byte_size =3D size_of_string_in_bytes (arg->ts.kind,
argse.string_length);
      else
        {
          if (arg->rank =3D=3D 0)
            byte_size =3D TREE_TYPE (build_fold_indirect_ref_loc (input_loc=
ation,
                                                                argse.expr)=
);
          else
            byte_size =3D gfc_get_element_type (TREE_TYPE (argse.expr));
          byte_size =3D fold_convert (gfc_array_index_type,
                                    size_in_bytes (byte_size));
        }
    }

ie. characters are treated separately.

The problem is that gfc_get_element_type will come back with void* (or perh=
aps
void if TYPE_STRING_FLAG is not set) because of the cast in the allocation:
            a.data =3D (void * restrict) __builtin_malloc (50);

which is what GFC_TYPE_ARRAY_DATAPTR_TYPE is coming back with.

I think that you will have to either interrogate the dtype for the element
length, use the span field or se->string_length if you know the kind.

Not so much a bug as a 'feature', I'm afraid.

Paul=