Lets pretend a few things, because I don't think you understand what I am getting at. I have application called "Music Box", I am release version 2.0.0 and it i

Lets pretend a few things, because I don't think you understand what I am getting at. I have application called "Music Box", I am release version 2.0.0 and it is QA'd before release against Pear OS 7.0. If Pear OS 8.0 is release a month later and breaks my application because of an API change their end. I would just release 2.0.1 of Music Box that fixes the defects. If I was proactive get hold of a beta or release candidate of Pear OS 8.0 and QA my application on there to see if there was any obvious defects. The same with a newer compiler or a newer hardware driver. I would just get hold of the beta / release candidate and fix it then. The one thing I wouldn't do is try compiling it on a completely different OS that none of my users use.