https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96055
Georg-Johann Lay <gjl at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Known to work| |12.1.0 Resolution|--- |FIXED Severity|normal |enhancement Priority|P3 |P5 Status|UNCONFIRMED |RESOLVED --- Comment #3 from Georg-Johann Lay <gjl at gcc dot gnu.org> --- Closed as fixed in v12+. ATmega324PB is present in the sources (gcc/config/avr/avr-mcus.def, Author=Matwey V. Kornilov) since v12.1 at least. If you want to use it with older versions of the compiler (and newer than v5.1), please follow the explanation in the avr-gcc wiki at https://gcc.gnu.org/wiki/avr-gcc#avr-gcc_v5_and_newer