Multiple config.php files

According to the CI 3.0.4+ documentation, the $config['base_url'] should not be left empty.
In my application/config folder I have two subfolders: development and production.
Each folder has a copy of the config.php file.
Except for the $config['base_url'] setting, both config.php files are identical.
Is it possible to use a shared config.php file in the application/config folder, and make CI also load a config.php file from the right environment subfolder that only contains the base_url setting?