Update of bug #28756 (project avr-libc):
Status: Need Info => Confirmed
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Follow-up Comment #13:
I can now see the problem with that code. They stupidly
parenthesize the call to clock_prescale_set() within another
macro, like:
#define Set_cpu_prescaler(x) (clock_prescale_set(x))
While this is completely pointless for a function with void
return value (as it could never become part of an arithmetic
expression), it's still legal C code.
I guess the best solution then is to use an inlined function
rather than a macro to implement clock_prescale_set().
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