Follow-up Comment #1, bug #23032 (project avr-libc):
Hmm, are you sure?
I see PORTxn, DDRxn, and PINxn bit names /are/ defined in
avr/iom1284p.h. However, the "generic" bit names (Pxn) are
not defined for that device. They should probably be
supplied through avr/portpins.h. However, the logic there
is just the opposite of what would be needed: they assume
the device's header file defines whatever Pxn bits are
applicable for each device, and then conditionally derive
PORTxn names from those.
This should probably turned around: make avr/portpins.h
define Pxn based on the presence of PORTxn. Alas, this
requires to rewrite all the existing device header files.
Another option would be to extend avr/portpins.h like:
#if defined(PORTA0) && !defined(PA0)
# define PA0 PORTA0
#endif
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