Advice on augmenting a common function interface

[Greg McGary <greg at mcgary dot org>]

I will be expanding the interface to build_pointer_type to accommodate
bounded pointer types, but retaining the old interface for compatibility.

I can define the old interface in terms of the new one.  A macro:

	#define build_pointer_type(TYPE) build_pointer_type_2 (POINTER_TYPE, (TYPE))

or a one-liner function:
    
	tree
	build_pointer_type (type)
	     tree type;
	{
	  return build_pointer_type_2 (POINTER_TYPE, type);
	}

Macros have lower overhead, but hinder debugging.  For my part,
debugging convenience is more important.

Is there a preferred method?

Greg