My two available platforms are Mac and Raspberry Pi. On the mac, I'm using crosspack. It's quite old, but it still works for most things (or at least the bugs are easy to work around). On the R-Pi, I'm using the avrtools package.
Neither responds properly to -mmcu=atmega328pb. Both *do* properly understand -mmcu=attiny841 - the second newest part I've come across. I particularly want to support some of the new features of the PB, like the second UART.
Is it possible to add support for the PB to an existing avr-gcc installation? Does anyone have a patch set or anything of the sort?