Clock uncertainty warnings under 10.0

How come there are ad links in your post? (Wondering if you did that or there is some new way to spam)?

I recommend against writing out an .sdc and using that. Treat the .sdc like HDL that you write, i.e. if Quartus could write out a machine-generated version of the same thing, you wouldn't want to overwrite your stuff. If anything, write_sdc to a junk file and then copy over the commands you want.

As for uncertainty, just have "derive_clock_uncertainty" in your .sdc instead of individual set_clock_uncertainty commands. It will always pick up all the clocks and you don't have to worry about it.