Timequest: toggle synchronizer constraints?

Note that there is a layer of TimeQuest info, such as unconstrained paths, that is not really part of .sdc. (Look at Check Timing for stuff that we warn about that could be correct, we just don't know.) I had someone who was adamant about making all those go away, while SDC doesn't have the commands to do that. There's nothing wrong with having an unconstrained clock if you don't want it constrained. I worry about adding constraints just to say it's unconstrained. If you step back and ask, How do you want this analyzed, the answer is that you don't want it analyzed.

One option is that you could put a create_clock directly on the .clk pin of the register, which should constrain the clock so it won't show up as unconstrained, but then cut that from all other analysis. (I haven't tried this).

Anyway, heading out on vacation so not sure when I'll get a chance to look at this again.