http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50816
--- Comment #8 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2011-10-24 11:53:16 UTC --- (In reply to comment #7) > Compile it as: > > $avr-gcc -mmcu=atxmega128a1 -g -gdwarf-2 test.c -S You are left alone with that: -mmcu=atxmega128a1 is not supported. See avr-gcc --target-help for a list of supported devices.