Hi,

   the small attached patch prevents gdb to segfault when an extension
language definition has no ops,
which e.g. occurs when HAVE_PYTHON is not defined so
extension_language_python remains with ops in NULL.
This causes the line
   if (extlang->ops->eval_from_control_command != NULL)
(in eval_ext_lang_from_control_command) to dereference a null pointer.

Please commit it for me if approved since I don't have write access.

Thanks,

   Daniel.


    2014-03-20    Daniel Gutson (daniel.gutson@tallertechnologies.com)

gdb/
    * extension.c: (eval_ext_lang_from_control_command) Added check to
prevent dereference of null pointer.