All right, I'm sure there must be a way to do it, but I'm blowed if I can find it...
Surely there must be a better way of getting floating point printf than including the line
-Wl,-u,vfprintf -lprintf_flt -lm
in the linker miscellaneous column?
I note of course that both libm and libprintf_flt can be included in the linker library section, assuming you know what they are since there's no drop down of available libraries, but I don't see anything which guarantees the -u flag unless it all goes in in one string.
Surely after all this time Atmel would have set things up with a nice friendly button 'do you want to use floating point formatting?'...