make atmega328_384_8
avr-gcc -g -Wall -Os -fno-inline-small-functions -fno-split-wide-types -mshort-calls -mmcu=atmega328p -DF_CPU=8000000L  '-DLED_START_FLASHES=3' '-DBAUD_RATE=38400'   -c -o optiboot.o optiboot.c
avr-gcc: error: unrecognized command line option ‘-mshort-calls’
make: *** [optiboot.o] Error 1