Background compilation

Paul Vick started a thread to provide a better understanding on a bug Roy mentioned earlier.

Very interesting, the first part is about background compilation.

From Paul's post:

Roy points to Philip’s complaint that VB still exhibits problems with multi-language solutions that have been around since the VS 2002 beta. Philip’s completely correct, and the explanation of why this bug still hasn’t been fixed even though we’ve known about it since before VS 2002 shipped bears some explanation. Specifically, the problem is with a mistake we made when designing our background compilation system a very long time ago. Since I’ve been asked more than a few times about how background compilation works, this is an excellent chance to delve into that subject. So let me talk about background compilation for a while and then we’ll get back to Philip’s bug.