Conflict between --build-path and --output-dir

[fisiognomico]

Describe the problem

When the flags --build-path and --output-dir are used together an empty binary is delivered in the output directory.

To reproduce

For example, there is the output of an example sketch from the Arduino_Portenta_OTA library:

 > arduino-cli compile -b arduino:mbed_opta:opta --library ../ArduinoCore-mbed/libraries/Portenta_SDCARD/  --libraries ../ --output-dir ./build/ota_sd --build-path ./build/ota_sd   --optimize-for-debug -e --build-property "build.extra_flags=\"-D ARDUINO_PORTENTA_OTA_SDMMC_SUPPORT=1\"" examples/OTA_SD_Portenta/OTA_SD_Portenta.ino

  > l build/ota_sd
[...]
-rwxr-xr-x 1 me me    0 Sep 14 18:04 OTA_SD_Portenta.ino.bin
-rwxr-xr-x 1 me me    0 Sep 14 18:04 OTA_SD_Portenta.ino.elf
-rw-r--r-- 1 me me      0 Sep 14 18:04 OTA_SD_Portenta.ino.hex
-rw-r--r-- 1 me me      0 Sep 14 18:04 OTA_SD_Portenta.ino.map
-rw-r--r-- 1 me me  453 Sep 14 18:03 build.options.json
-rw-r--r-- 1 me me  36K Sep 14 18:04 compile_commands.json
[...]

Expected behavior

By omitting the --build-path flag a correct build is produced.

  > l build/ota_sd
[...]
-rwxr-xr-x 1 me me 439K Sep 14 18:02 OTA_SD_Portenta.ino.bin
-rwxr-xr-x 1 me me 5.6M Sep 14 18:02 OTA_SD_Portenta.ino.elf
-rw-r--r-- 1 me me 1.3M Sep 14 18:02 OTA_SD_Portenta.ino.hex
-rw-r--r-- 1 me me 8.9M Sep 14 18:02 OTA_SD_Portenta.ino.map

Arduino CLI version

arduino-cli Version: 0.32.2-arch Commit: 2661f5d Date:

Operating system

Linux

Operating system version

Arch Linux

Additional context

No response

Issue checklist

• I searched for previous reports in the issue tracker
• I verified the problem still occurs when using the nightly build
• My report contains all necessary details

[alessio-perugini]

👋 Hello, thank you for the report. I'm able to reproduce this also on master.
I've spotted the 🐛 Before the fix will be shipped in the next release you'll have to wait a bit more than usual. (we're currently working on a huge refactoring, and we'll do a longer round of testing). 🤓