def METHOD_NAME(self, options_map):
    """Add map dict between options and values
        map names starting with _opt_ are allowed without corresponding option
    """
    for name in options_map.keys():
        if name not in self:
            if name.startswith('_opt_'):
                self.log.devel("_add_options_map: no option with name %s defined, but allowed", name)
            else:
                raise EasyBuildError("No toolchain option with name %s defined", name)
    self.options_map.update(options_map)