Just comparing the output of avr-gcc --target-help gives --- gcc-5.4.txt 2021-02-11 09:56:37.490084599 +0100 +++ gcc-10.2.txt 2021-02-11 09:56:30.918162094 +0100 @@ -160,9 +160,14 @@ attiny13 attiny13a attiny15 +attiny1614 +attiny1616 +attiny1617 attiny1634 attiny167 attiny20 +attiny212 +attiny214 attiny22 attiny2313 attiny2313a @@ -173,8 +178,13 @@ attiny261 attiny261a attiny28 +attiny3214 +attiny3216 +attiny3217 attiny4 attiny40 +attiny412 +attiny414 attiny416 attiny417 attiny4313 @@ -186,6 +196,7 @@ attiny461a attiny48 attiny5 +attiny814 attiny816 attiny817 attiny828
So gcc10 actually knows about some more parts. I don't know if there are any missing patches upstream though. Arch seems to carry the latest upstream gcc for AVR with no complaints though.
