upload flag to compile command doesn't work without output name

[ademuri]

Specifying the -u flag to compile doesn't work unless I also specify -o to give an output file name. For example,

this doesn't work:

$ arduino-cli compile -b "arduino:samd:mkrzero" -p /dev/ttyACM1 -u serial_test.ino
Sketch uses 11288 bytes (4%) of program storage space. Maximum is 262144 bytes.
Error during Upload: cannot open sketch: stat serial_test.ino/serial_test.ino.arduino.samd.mkrzero.bin: not a directory

but this does:

$ arduino-cli compile -b "arduino:samd:mkrzero" -p /dev/ttyACM1 -u serial_test.ino -o serial_test.bin

It'd be nice if this flag worked without -o, so that the output file would automatically be generated in the temp dir.

[per1234]

Closing as fixed by #690