RE: [Avr-libc-corelib] proposed corelib style guide

[Ron Kreymborg]

> The code below works even without ever defining the weak function, so
> defining the function can be reserved for the user when they need it.
> 
> 
> uint8_t i2c_get_address (void) __attribute__ ((weak));
> 
> if (i2c_get_address)
>       i2c_get_address ();
> 
> --John

Looks a good solution to me, with the else providing an error or an
alternate operation.

Ron