def parallelCCompile(self, sources, output_dir=None, macros=None, include_dirs=None, debug=0, extra_preargs=None, extra_postargs=None, depends=None):
    # those lines are copied from distutils.ccompiler.CCompiler directly
    macros, objects, extra_postargs, pp_opts, build = self._setup_compile(output_dir, macros, include_dirs, sources, depends, extra_postargs)
    cc_args = self._get_cc_args(pp_opts, debug, extra_preargs)
    # parallel code
    N=4 # number of parallel compilations
    import multiprocessing.pool
    def _single_compile(obj):
        try: src, ext = build[obj]
        except KeyError: return
        self._compile(obj, src, ext, cc_args, extra_postargs, pp_opts)
    # convert to list, imap is evaluated on-demand
    list(multiprocessing.pool.ThreadPool(N).imap(_single_compile,objects))
    return objects