If the generator kept a list of compiled files, and only processed new and newer-modified files, the generation time after any small modification to the source files would be greatly reduced.
I agree with you chetan51.
Besides, did you have a look at the -k option on the command line?
It might help you...
Yeah, I found that option soon after posting this feature request. It's very close to what I requested, so actually I have no problem now! Thanks.