avr-mcus.def has doublicate entries for some devices: atmega16hva, atmega16hva2, atmega16hvb, atmega16m1, atmega16u4, atmega32hvb, atmega32a, atmega32c1, ... See also the duplicates in the documentation at http://gcc.gnu.org/onlinedocs/gcc-4.8.1/gcc/AVR-Options.html#AVR-Options
Created attachment 30258 [details] Patch against avr-mcus.def Notice that some sources depend on the patch, e.g. documentation. Rerun "make avr-mcus" after applying this patch.
Fixed by 200870 (trunk), 200871 (4.8.2).
Fixed by r200870 (trunk), r200871 (4.8.2).