Hallo Sebastian,

jetzt meldet der Linker:

Linking: main.elf
avr-gcc -mmcu=atmega8 -I. -gdwarf-2 -DF_CPU=8000000UL -Os -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums -Wall -Wstrict-prototypes -Wa,-adhlns=test.o -std=gnu99 -Wundef -MMD -MP -MF .dep/main.elf.d test.o --output main.elf -Wl,-Map=main.map,--cref -lm
c:/programme/winavr/bin/../lib/gcc/avr/4.1.2/../../../../avr/lib/avr4/crtm8.o: In function `__vectors':
../../../../../avr-libc-1.4.6/crt1/gcrt1.S:51: undefined reference to `main'
make.exe: *** [main.elf] Error 1

Danke für Deinen Input!

Gruß Je