More precisely, 
for stringobject.c:
	 static PyObject *
	SubString_new_object_or_empty(SubString *str)
	{
	    if (str->ptr ==((void *)0)) {
	        return PyString_FromStringAndSize(((void *)0), 0);
	    }
	    return PyString_FromStringAndSize(str->ptr, str->end - str->cpp 612: suicide: sys: trap: fault write addr=0xdeffeff4 pc=0x00008705

The last line shows PyString_FromStringAndSize() function in cpython/Objects/stringobject.c,
and to do return (PyObject *) op;
Probably, this 'op' is not on the memory...

I replaced /386/bin/cpp by that from 9legacy'e one, and recompiled.
Yes, it's Ok with no problem.

Therefore 9front's /386/bin/cpp has some problem, I think.

Kenji