Allows custom windows-targets function visibility.

[rodrigocfd]

Currently the link! macro only produces functions with pub visibility. I'm looking forward to add windows_targets as a dependency to winsafe – as proposed here and clarified here – and being able to specify the function visibility would be handy.

[rodrigocfd]

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[kennykerr]

Please open an issue. This change alone will not work as the other crates that depend on windows-targets would need to agree on how they use the link macro.

[rodrigocfd]

This change alone will not work as the other crates that depend on windows-targets would need to agree on how they use the link macro.

The vis attribute can be empty, so no changes would be needed on the user's side.

[kennykerr]

Fair enough, I'll let the build validate.

[kennykerr]

The vis attribute can be empty, so no changes would be needed

I think the problem is going to be that existing code expects it to be public.

[kennykerr]

You should be able to use the link macro within a module, typically called bindings, and then control the visibility from the outer module. That should give you what you need without changes to the link macro.

[rodrigocfd]

You should be able to use the link macro within a module, typically called bindings, and then control the visibility from the outer module. That should give you what you need without changes to the link macro.

That's exactly how I'm using it today, I confined all declarations whithin a module, so they won't escape to public visibility. I saw the change as a good opportunity to make it more strictly correct.

However we have a problem now. If "no visibility" is informed (empty $vis), Rust sees as "module private" visibility. However, the current link! implementation interprets "no visibility" as pub, because $vis is never informed today (it simply doesn't exist).

So adding $vis to the link! macro would fundamentally change the link! signature, and all users would be forced to update its usage, because everything would be private by default. It would be fairly easy to catch though – the compiler would immediately inform that the funcions are private.

But is such a change acceptable?

[kennykerr]

I'm not opposed to it in theory, but it would be a breaking change and there just doesn't seem to be enough reason to warrant that right now.

[rodrigocfd]

I agree. Since the visibility can me mitigated by wrapping the declarations inside a module, a breaking change doesn't seem reasonable by now.

If needed in the future, however, the seed has been planted.

[kennykerr]

Yep, I wish I thought of it sooner. 😜 Thanks for the suggestion!