avr-g++: error: missing device or architecture after '-mmcu='

[ChillarAnand]

When running arduino from rasp pi cli, it is not passing mmcu.

Picked up JAVA_TOOL_OPTIONS: 
Loading configuration...
Initializing packages...
Preparing boards...
Verifying...
/home/pi/projects/vendor/arduino/arduino-builder -dump-prefs -logger=machine -hardware /home/pi/projects/vendor/arduino/hardware -tools /home/pi/projects/vendor/arduino/tools-builder -tools /home/pi/projects/vendor/arduino/hardware/tools/avr -built-in-libraries /home/pi/projects/vendor/arduino/libraries -libraries /root/Arduino/libraries -fqbn=arduino:avr:mega -vid-pid=0X2341_0X0042 -ide-version=10804 -build-path /tmp/arduino_build_293002 -warnings=null -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.avrdude.path=/home/pi/projects/vendor/arduino/hardware/tools/avr -prefs=runtime.tools.avr-gcc.path=/home/pi/projects/vendor/arduino/hardware/tools/avr -prefs=runtime.tools.arduinoOTA.path=/home/pi/projects/vendor/arduino/hardware/tools/avr -verbose /tmp/arduino.ino
/home/pi/projects/vendor/arduino/arduino-builder -compile -logger=machine -hardware /home/pi/projects/vendor/arduino/hardware -tools /home/pi/projects/vendor/arduino/tools-builder -tools /home/pi/projects/vendor/arduino/hardware/tools/avr -built-in-libraries /home/pi/projects/vendor/arduino/libraries -libraries /root/Arduino/libraries -fqbn=arduino:avr:mega -vid-pid=0X2341_0X0042 -ide-version=10804 -build-path /tmp/arduino_build_293002 -warnings=null -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.avrdude.path=/home/pi/projects/vendor/arduino/hardware/tools/avr -prefs=runtime.tools.avr-gcc.path=/home/pi/projects/vendor/arduino/hardware/tools/avr -prefs=runtime.tools.arduinoOTA.path=/home/pi/projects/vendor/arduino/hardware/tools/avr -verbose /tmp/arduino.ino
Using board 'mega' from platform in folder: /home/pi/projects/vendor/arduino/hardware/arduino/avr
Using core 'arduino' from platform in folder: /home/pi/projects/vendor/arduino/hardware/arduino/avr
Detecting libraries used...
"/home/pi/projects/vendor/arduino/hardware/tools/avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics  -flto -w -x c++ -E -CC -mmcu= -DF_CPU=16000000L -DARDUINO=10804 -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR   "-I/home/pi/projects/vendor/arduino/hardware/arduino/avr/cores/arduino" "-I/home/pi/projects/vendor/arduino/hardware/arduino/avr/variants/mega" "/tmp/arduino_build_293002/sketch/arduino.ino.cpp" -o "/dev/null"
Generating function prototypes...
"/home/pi/projects/vendor/arduino/hardware/tools/avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics  -flto -w -x c++ -E -CC -mmcu= -DF_CPU=16000000L -DARDUINO=10804 -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR   "-I/home/pi/projects/vendor/arduino/hardware/arduino/avr/cores/arduino" "-I/home/pi/projects/vendor/arduino/hardware/arduino/avr/variants/mega" "/tmp/arduino_build_293002/sketch/arduino.ino.cpp" -o "/tmp/arduino_build_293002/preproc/ctags_target_for_gcc_minus_e.cpp"
avr-g++: error: missing device or architecture after '-mmcu='

Here is the same working correctly from ubuntu cli

"/home/chillaranand/projects/vendor/arduino/hardware/tools/avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -MMD -flto -mmcu=atmega2560 -DF_CPU=16000000L -DARDUINO=10803 -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR   "-I/home/chillaranand/projects/vendor/arduino/hardware/arduino/avr/cores/arduino" "-I/home/chillaranand/projects/vendor/arduino/hardware/arduino/avr/variants/mega" "/home/chillaranand/projects/vendor/arduino/hardware/arduino/avr/cores/arduino/WMath.cpp" -o "/tmp/arduino_build_178850/core/WMath.cpp.o"
"/home/chillaranand/projects/vendor/arduino/hardware/tools/avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections
 -fdata-sections -fno-threadsafe-statics -MMD -flto -mmcu=atmega2560 -DF_CPU=16000000L -DARDUINO=10803 -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR   "-I/home/chillaranand/projects/vendor/arduino/hardware/arduino/avr/cores/arduino" "-I/home/chillaranand/projects/vendor/arduino/hardware/arduino/avr/variants/mega" "/home/chillaranand/projects/vendor/arduino/hardware/arduino/avr/cores/arduino/WString.cpp" -o "/tmp/arduino_build_178850/core/WString.cpp.o"

[matthijskooijman]

You didn't say how you are calling the Arduino IDE on the CLI, which seems to be essential information here. The builder commandline contains -fqbn=arduino:avr:mega which suggests that is the board name you are passing on the commandline. However, it is missing the cpu option that distinguishes between the Mega with 2560 and 1280.

When I select the mega2560 in the Arduino IDE GUI and run verify, I see -fqbn=arduino:avr:mega:cpu=atmega2560 in the verbose output, which I think should fix your issue.

[ChillarAnand]

@matthijskooijman I am using this command

arduino --port /dev/ttyACM* --board arduino:avr:mega --upload foo.ino

[per1234]

Try this:

arduino --port /dev/ttyACM* --board arduino:avr:mega:cpu=atmega2560 --upload foo.ino

[ChillarAnand]

Thanks. It fixed the issue. Is it documented anywhere?

[facchinm]

https://github.com/arduino/Arduino/blob/master/build/shared/manpage.adoc#options 😉

[matthijskooijman]

@facchinm, perhaps it would make sense for the IDE or arduino-builder to detect a missing parameter and error out (listing all possible values for the parameter perhaps)? AFAICS it is never valid to omit a parameter, right (the GUI doesn't allow this either)? This is a common problem it seems, and listing the valid fqbns would be helpful to users.

[facchinm]

I agree about adding a command to list available fqbns. Don't have any strong opinion about failing on missing parameter, though.