On Fri, Dec 22, 2023, 18:46 Steve Downey <sdowney_at_[hidden]> wrote:

> A -Wnone on what translation unit?
>

When translating the module source that is from "the system".

Example at hand is where `std::optional<int16_t> c{300000};` is warnings
> clean because the template is in the system header file. Now, this is a
> case where it probably really ought to warn, but doesn't.
>

I would expect an instantiation that happens because of the local code to
warn, yes.

If compilers don't warn on that today I'd consider it a bug.

But it's also a case where previously clean code is going to fail, but
> there are probably cases where the warning is triggered by something the
> client can't control.
>

Right, a warning created by an instantiation in the module source for a
"foreign" module probably shouldn't warn.

Daniel

>