how to config compiler warning level

[resos1]

Hello,
I'm looking for the setting to change the compiler warning level, equivalent config in preferences window of arduino ide (attached image)

I've already tried #1392 but it doesn't worked for me, that kept adding -w parameter and ignoring the -Wall parameter.
I Prefer to set this setting to "Default", does it means that I just need to remove -w parameter, right? how can I do that?

[benmcmorran]

Hi @resos1! #1392 is almost right, but you just need to set a different preference. Try adding this to your arduino.json. You can see all the preferences by viewing %LOCALAPPDATA%\Arduino15\preferences.txt.

    "buildPreferences": [["compiler.warning_level", "default"]]

[resos1]

thanks a lot, it works now.

[Benik3]

Does this should still works?
I tried it and still got the same output. Maybe it doesn't work with the new CLI?
I tried to add into arduino.json:

"buildPreferences": [
        ["build.extra_flags", "-Wall"],
        ["compiler.cpp.extra_flags", "-Wall"],
        ["compiler.warning_level", "all"]
    ]

Also output say: "Please see the build logs in output path: f:\Dokumenty\Arduino\ArduinoOutput"
but there is no log, only compiled files.

I see that CLI has option --warnings string Optional, can be: none, default, more, all. Used to tell gcc which warning level to use (-W flag). (default "none") but I don't know how to set it.

[da-phil]

@Benik3

Does this should still works?

At least not for me, and it's clear why not, you already explained it:
The buildPreferences list is getting translated to --build-property STRING arduino CLI arguments, and the actual config to change the warnings level is a separate CLI option --warnings STRING.

It would be really cool if vscode-arduino would expose the same config option in the main config, otherwise it's impossible to append this CLI option to the internal arduino CLI invocations.