I’ve used the latest snapshot from Sourceforge, sdcc-snapshot-universal-apple-macosx-20170709-9946.tar.bz2, and get several warnings:
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$ make CRPA=1
sdcc -Iinc/ --model-large --std-sdcc99 -DCRPA -c src/main.c -o bin/main.rel
sdcc -Iinc/ --model-large --std-sdcc99 -DCRPA -c src/radio.c -o bin/radio.rel
src/radio.c:365: warning 94: comparison is always false due to limited range of data type
sdcc -Iinc/ --model-large --std-sdcc99 -DCRPA -c src/usb.c -o bin/usb.rel
src/usb.c:49: warning 158: overflow in implicit constant conversion
src/usb.c:50: warning 158: overflow in implicit constant conversion
src/usb.c:567: warning 158: overflow in implicit constant conversion
src/usb.c:567: warning 158: overflow in implicit constant conversion
sdcc -Iinc/ --model-large --std-sdcc99 -DCRPA -c src/usbDescriptor.c -o bin/usbDescriptor.rel
sdcc -Iinc/ --model-large --std-sdcc99 -DCRPA -c src/led.c -o bin/led.rel
sdcc -Iinc/ --model-large --std-sdcc99 -DCRPA -c src/utils.c -o bin/utils.rel
sdcc --xram-loc 0x8000 --xram-size 2048 --model-large bin/main.rel bin/radio.rel bin/usb.rel bin/usbDescriptor.rel bin/led.rel bin/utils.rel -o bin/cradio.ihx
sdobjcopy -I ihex bin/cradio.ihx -O binary bin/cradio.bin
Crazyradio PA build
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static char radioChannel = -1;
Note also that sdcc now comes with sdobjcopy (generates the same output here as arm-eabi-objcopy, so shouldn’t be a problem)