Add configuration option for `--warnings` (and maybe `--optimize-for-debug`)

[matthijskooijman]

Bug Report

Current behavior

arduino-cli compile has a --warnings option to enable warnings for a single compilation run.

Expected behavior

I would like to be able to set a default value for --warnings in my config file (i.e. to enable warnings on all compilations).

Environment

• CLI version (output of arduino-cli version): recent git master
• OS and platform: Linux, x86_64.

[ubidefeo]

@matthijskooijman
would you really want --optimize-for-debug on as a default?
I think it's kinda counterproductive unless you add it to an extra config file that you point to during heavy development days, but seems like a stretch :D

maybe we could add a -o shortcut for that flag since it's available (cc @silvanocerza )

[matthijskooijman]

would you really want --optimize-for-debug on as a default?

Possibly, yes. 99% (or something like that) of the uploads I do are during development, for testing, only a fraction is actually uploading a final product (and even then -Og is not really problematic). And regardless, it seems like something that would be easy to implement and the type of option that would make sense as a config directive along with enabling warnings, even if not a lot of people would end up using it.

maybe we could add a -o shortcut for that flag since it's available (cc @silvanocerza )

That could also be a good idea, though I'd consider doing this in addition to adding a config option.

Maybe -d (for "debug") or -g (matching gcc) would be better, though?

[ubidefeo]

Possibly, yes. 99% (or something like that) of the uploads I do are during development

living on the edge :D

I'll push for a config setting, and I think I'd go for -d to keep it closer to debug unless -d can be confusing for some reason

[matthijskooijman]

Sounds good, thanks!

Just realized that this also means a --no-optimize-for-debug is needed, to reverse the setting from the config file (for the 1% where you do want to make a production build).