Command line compile + upload - "Unidentified Reference to Setup/Loop"

Hi I am trying to compile once and mass upload to multiple microcontrollers (pinoccio's specifically) when I am seeing this weird error of:

core.a(main.cpp.o): In function `main':
/Applications/Arduino.app/Contents/Resources/Java/hardware/arduino/avr/cores/arduino/main.cpp:37: undefined reference to `setup'
/Applications/Arduino.app/Contents/Resources/Java/hardware/arduino/avr/cores/arduino/main.cpp:40: undefined reference to `loop'
collect2: error: ld returned 1 exit status

Occasionally, I am seeing this error as well:

/Applications/Arduino.app/Contents/Resources/Java/hardware/tools/avr/bin/avr-objcopy: error: the input file 'Bootstrap.cpp.elf' is empty

To build, I am using:

/Applications/Arduino.app/Contents/MacOS/JavaApplicationStub --verify --pref build.path=/tmp/oyoroi /Users/vng/OyoroiPinoccio/libraries/pinoccio/examples/Bootstrap/Bootstrap.ino

And to upload, I am using:

/Applications/Arduino.app/Contents/MacOS/JavaApplicationStub --upload --pref build.path=/tmp/oyoroi --port /dev/tty.usbmodem145311 /Users/vng/OyoroiPinoccio/libraries/pinoccio/examples/Bootstrap/Bootstrap.ino
/Applications/Arduino.app/Contents/MacOS/JavaApplicationStub --upload --pref build.path=/tmp/oyoroi --port /dev/tty.usbmodem145321 /Users/vng/OyoroiPinoccio/libraries/pinoccio/examples/Bootstrap/Bootstrap.ino
/Applications/Arduino.app/Contents/MacOS/JavaApplicationStub --upload --pref build.path=/tmp/oyoroi --port /dev/tty.usbmodem145411 /Users/vng/OyoroiPinoccio/libraries/pinoccio/examples/Bootstrap/Bootstrap.ino
/Applications/Arduino.app/Contents/MacOS/JavaApplicationStub --upload --pref build.path=/tmp/oyoroi --port /dev/tty.usbmodem145421 /Users/vng/OyoroiPinoccio/libraries/pinoccio/examples/Bootstrap/Bootstrap.ino

Does anyone know what's causing all these errors?

Note that I pause for 5 seconds between compiling and uploading.

Script: https://gist.github.com/vicngtor/c2aea9789f5985493d98

[matthijskooijman]

Are you running multiple of these commands in parallel? If so, they're probably sharing the same build dir and overwriting each others files?

Yes I am. Wouldn't this allow me to compile once and upload many times?

If so I guess a quick hack would be to cp -r the build directory and have each instance of the upload subprocess to use its own copy of the build.path.

[matthijskooijman]

Ah, you're doing the --verify once, and --upload in parallel. However, --upload really does a compile and then an upload. And currently the IDE isn't perfect in the "don't compile unless needed" - it always redoes the preprocessing, recompiles the sketch, repacks core.a (this will be fixed soon) and relinks everything.

Copying the build directory is probably the fast way to handle this. Alternatively, you could call avrdude directly. The perfect solution for this would be to have the IDE really not recompile anything when no sources changed, but that requires more explicit tracking of dependencies (which is complicated by the preprocessing step).

Note, this issue isn't closed, the previous empty issue you filed is closed (and I referenced this issue, so it's listed here as referenced).

Thanks. Invoking avrdude directly is much more stable.

For those interested, https://github.com/vicngtor/PinoccioMassUpload/blob/master/upload.py