Is the "-c" command line option implemented in gendaylit?

I was taking a look at the source code of gendaylit.c, and show an undocumented command line option: “-c”. It sets a variable called “cloudy” which according to the source code comments can take as possible values 0 (default), 1 (standard), or 2 (uniform).

However, that “cloudy” variable is used just once, in a test, and it’s compared just against zero. The values 1 and 2 doesn’t seem to be implemented…

So, what’s the purpose of the “-c” option? Is it implemented or not?