[gentoo-user] How to mount /tmp as tmpfs?

[Nikos Chantziaras]

It seems that mounting /tmp as a tmpfs filesystem isn't just a matter of 
adding an fstab entry.  Sometimes, on bootup, I get error messages:

  fusermount: error: /tmp/dsflkjslfjsdlsomegarbledname doesn't exist
Or something like that (it scrolls by very fast and openrc doesn't seem 
to log anything.)

Is there a safe way to mount /tmp early on?  It seems that mounting it 
through fstab is mounting it too late and files have already been 
created in it (which are then lost when mounting it.)