[Bug c++/94058] defaulted three way comparison operator defined as deleted when a member is a small bitfield of long type.

[mpolacek at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94058

--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
This may implement that DR:

--- a/gcc/cp/typeck2.cc
+++ b/gcc/cp/typeck2.cc
@@ -1012,6 +1012,14 @@ check_narrowing (tree type, tree init, tsubst_flags_t
complain,
       if (TREE_CODE (ftype) == ENUMERAL_TYPE)
    /* Check for narrowing based on the values of the enumeration. */
    ftype = ENUM_UNDERLYING_TYPE (ftype);
+      /* Undo convert_bitfield_to_declared_type.  (STRIP_NOPS would not be
+    enough).  */
+      tree stripped_init = init;
+      while (CONVERT_EXPR_P (stripped_init))
+   stripped_init = TREE_OPERAND (stripped_init, 0);
+      /* Core 2627  */
+      if (is_bitfield_expr_with_lowered_type (stripped_init))
+   ftype = TREE_TYPE (stripped_init);
       if ((tree_int_cst_lt (TYPE_MAX_VALUE (type),
                TYPE_MAX_VALUE (ftype))
       || tree_int_cst_lt (TYPE_MIN_VALUE (ftype),