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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/48396] std::type_info is implicitly declared
Date: Tue, 14 Sep 2021 20:05:09 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D48396

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
cp/rtti.c defines:

/* Declare language defined type_info type and a pointer to const
   type_info.  This is incomplete here, and will be completed when
   the user #includes <typeinfo>.  There are language defined
   restrictions on what can be done until that is included.  Create
   the internal versions of the ABI types.  */

void
init_rtti_processing (void)
{
  push_nested_namespace (std_node);
  tree type_info_type =3D xref_tag (class_type, get_identifier ("type_info"=
));
  pop_nested_namespace (std_node);
  const_type_info_type_node
    =3D cp_build_qualified_type (type_info_type, TYPE_QUAL_CONST);
  type_info_ptr_type =3D build_pointer_type (const_type_info_type_node);

  vec_alloc (unemitted_tinfo_decls, 124);

  create_tinfo_types ();
}

Is there a way to do that without making it visible to user code? Or without
implicitly adding it to the GMF?=