Added a special exit code 254 when there is nothing to generate. This situation should be distinguishable from other generation errors, because it may be a normal situation and not an error upstream. However, it is still treated as an error, like in the previous version, and because MPS also treats this situation as an error.
Changed the exit code of a generic generation error to always be 255. Previously -1 was used, which resulted in -1 or 255 depending on the system.
Changes:
254when there is nothing to generate. This situation should be distinguishable from other generation errors, because it may be a normal situation and not an error upstream. However, it is still treated as an error, like in the previous version, and because MPS also treats this situation as an error.255. Previously-1was used, which resulted in-1or255depending on the system.