Follow-up Comment #9, bug #50811 (project avr-libc):
Re. the "compiler thing" mentioned above:
avr-gcc might replace a call to printf by a call to puts provided the
arguments of printf allows to do so. You can avoid this optimization by means
of -fno-builtin-printf which takes away any knowledge (except prototype
information) about printf from the compiler. This will result in a call to
printf (which you are using anyway), saving the call to fputs.
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