Does the attached patch fix the issue pointed out by Ulrich Weigand
here: https://sourceware.org/ml/gdb-patches/2014-06/msg00169.html

ChangeLog
2014-06-04  Siva Chandra Reddy  <sivachandra@google.com>

        * python/py-xmethods.c (invoke_match_method)
        (gdbpy_get_matching_xmethod_workers, gdbpy_get_xmethod_arg_types):
        Cast the second arg to PyObject_GetAttrString and
        PyObject_GetAttrString to char *.