Thus spake Ray Kohler <[EMAIL PROTECTED]>: > Has anyone tried building world/kernel with high optimizations (-O2, > -O3) recently? What breaks? (Booby prize to whoever says "common sense" > ;) I last tried it quite a few months ago and the resolver died on me, > don't know what else. I'm not really thinking of running like that, but > I am curious about others' experiences.
First, let me answer the question that you really meant to ask but forgot to, namely, ``How much of a performance difference does -O3 make over -O for the kernel/world?'' The answer is ``very little, for most purposes.'' So if you do use higher optimization levels, at least do a little benchmarking to make sure it was worth it. To answer your second question, higher optimization levels usually work, but there *will* be new bugs. I know of several libc problems due to -fstrict-aliasing, and I'm told that the inline assembly for TCP checksumming can still break. To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message
