Add suuport for ohos env

[LuuuXXX]

Add suuport for ohos env.

[LuuuXXX]

Hello?! 😀

It seems like it hasn't been updated for a long time.

[Phantomical]

You created this PR 30 minutes ago. It's really only chance that I happened to be looking at github right now. Have some patience.

Anyway I'm happy to add support for the OpenHarmony targets but I'm going to ask that you verify that things actually build as expected there first. Running cargo doc for that target and verifying that the ioctl functions show up and build should be good enough.

So, review comments:

• You don't need to silence those warnings. unsafe_op_in_unsafe_fn isn't enabled by default until edition 2024 and if you rebase on the latest main you'll find that the unused_imports warning will go away.
• You're adding the cfg value in the wrong place. You need to add it in lib.rs. Rebasing on latest main will mean that the one you've changed is no longer necessary.

Some other notes:

• It looks like there's an armv7 ohos target. If you want the bindings to be present there then you will need to update the regenerate.sh script to generate armv7 bindings. Do this in a separate PR, if you do. See the comments in regenerate.sh for details on what to do.

[LuuuXXX]

Thank you very much.
I'm trying to build a compiler with ohos target using the latest rust source (master), and the above is a tentative modification I followed the compiler's prompts.

[LuuuXXX]

I just tried to replace the old dependency version with the latest version, but it seems like the problem still exists:

[Phantomical]

I think you have the wrong repo here. This one contains the perf-event2 and perf-event-open-sys2 crates. The error message there shows that you are using the perf-event-open-sys crate.

You might be better off asking questions about building rust on ohos on http://users.rust-lang.org or in the rust-lang discord. There is probably an easier way to go about this than having to patch out all warnings in crates that the rust compiler depends on.

[LuuuXXX]

This one contains the perf-event2 and perf-event-open-sys2 crates. The error message there shows that you are using the perf-event-open-sys crate.

Yes. Actually, I renamed perf-event-open-sys2 to perf-event-open-sys at Cargo.toml.

By the way，Would you mind releasing a new version for previous modifications(#58)? Thank you very much.

[LuuuXXX]

Is it convenient to reveal when the next version will be published?

[Phantomical]

I have released perf-event-open-sys2 v5.0.6 with the new code. I am going to close this PR for now, since it seems like the primary issue has been resolved.

I still suspect you'll be better off configuring the rustc build to run without -D warnings but that's up to you.