Don't use PLY cache files in Tools/Scripts/run-bindings-tests

Source/bindings/scripts/idl_compiler.py

 #!/usr/bin/python
 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 68 matching lines @@
 class IdlCompiler(object):
     """Abstract Base Class for IDL compilers.
 
     In concrete classes:
     * self.code_generator must be set, implementing generate_code()
       (returning a list of output code), and
     * compile_file() must be implemented (handling output filenames).
     """
     __metaclass__ = abc.ABCMeta
 
-    def __init__(self, output_directory, cache_directory='',
+    def __init__(self, output_directory, cache_directory=None,
                  code_generator=None, interfaces_info=None,
                  interfaces_info_filename='', only_if_changed=False,
                  target_component=None):
         """
         Args:
             interfaces_info:
                 interfaces_info dict
                 (avoids auxiliary file in run-bindings-tests)
             interfaces_info_file: filename of pickled interfaces_info
         """
-        cache_directory = cache_directory or output_directory
         self.cache_directory = cache_directory
         self.code_generator = code_generator
         if interfaces_info_filename:
             with open(interfaces_info_filename) as interfaces_info_file:
                 interfaces_info = pickle.load(interfaces_info_file)
         self.interfaces_info = interfaces_info
         self.only_if_changed = only_if_changed
         self.output_directory = output_directory
         self.target_component = target_component
         self.reader = IdlReader(interfaces_info, cache_directory)
@@ skipping 62 matching lines @@
         # |input_filename| should be a file which contains a list of IDL
         # dictionary paths.
         generate_dictionary_impl(options, input_filename)
     else:
         # |input_filename| should be a path of an IDL file.
         generate_bindings(options, input_filename)
 
 
 if __name__ == '__main__':
     sys.exit(main())