Follow-up Comment #3, bug #50811 (project avr-libc):
Using _Wl,-u,vfprintf is essentially forcing the symbol vfprintf to be
undefined and added to the program. This is what's causing your code size to
increase when not otherwise using vfprintf.
It isn't clear to me why that option should be required at all. You should
only need to add the -lprintf_min option and that will pull in vprintf, if its
used, and won't pull anything in if it isn't.
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