Another `IORPCMessage` debug trait issue

[segevfiner]

See https://github.com/segevfiner/keepawake-rs/actions/runs/4272014787/jobs/7436882628

 error[E0119]: conflicting implementations of trait `Debug` for type `IORPCMessage`
     --> /Users/runner/work/keepawake-rs/keepawake-rs/target/aarch64-apple-darwin/release/build/apple-sys-7a498b7b0123b7f9/out/IOKit.rs:55036:10
      |
55036 | #[derive(Debug)]
      |          ^^^^^ conflicting implementation for `IORPCMessage`
...
82951 | impl ::std::fmt::Debug for IORPCMessage {
      | --------------------------------------- first implementation here
      |
      = note: this error originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)

[segevfiner]

Bumping to macos-12 seems to have fixed it. Guess the issue is with macos-11. Obviously we don't want a fix to break macos-12+ support if macos-11 support is something you care about.

[youknowone]

apple-sys is very dependent on macOS SDK versions by design unless #10 be completed.

[youknowone]

probably adding derive check around here will be possible https://github.com/youknowone/apple-sys/blob/main/bindgen/src/builder.rs#L108

[newbeeAirfeeen]

Regarding the above issue, I encountered the same situation on macos monterey 12 version. In the header file IORPC.h of the Apple System SDK, IORPCMessage is a struct. bindgen provides derive-debug for struct by default。
The following is your code snippet and part of bindgen cargo expand code snippet

1. apple-sys/bindgen/builder.rs:47
   
   2.cargo expand

BindgenOptions {
        rust_target,
        rust_features: (rust_target.into()),
        layout_tests: true,
        derive_copy: true,
        derive_debug: true,
        anon_fields_prefix: (DEFAULT_ANON_FIELDS_PREFIX.into()),
.....

What I don't understand is:
Why extra writing

        for ty in &self.config.impl_debugs {
            if out.contains(ty) {
                out.push_str(&format!(
                    r#"
                       impl ::std::fmt::Debug for {ty} {{
                          fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {{
                          f.debug_struct(stringify!(#ty)).finish()
                       }}
                 }}
                "#
                ));
            }
        }

Below is my modified version. As shown below:

Below is my modified version. Add as builder = builder in apple-sys/bindgen/builder.rs:65

             .derive_debug(true)
             .clang_args(&clang_args)
             .layout_tests(self.config.layout_tests)
             .rustfmt_bindings(true);

Make sure the value of derive_debug is true. Then comment out the extra code mentioned above and the related code in Bindgen.toml. Then I successfully built it. Do you think there is anything wrong with this? If it's okay with you, I can submit a PR. Thanks!

[Nadahar]

I have the same problem when trying to build RustDesk on macOS 12, and to be honest I don't have a clue about what to do about it or what's causing it. I assume it's caused by incompatible versions of xcode, rust, macOS and whatnot, but is there any way for a non-rust-guru to figure out how to get past this?

The closest I've come to any understanding is that there's a macro defined that is already defined in ::std::fmt::Debug. I guess that this hasn't always been the case, or this would probably never have been defined here - but what decides if it's already defined in ::std::fmt::Debug? Does that depend on the Rust version itself, or on some other component on macOS that I can change the version of? Or did I just misunderstand this completely?