Linking with XCFrameworks doesn't work

[MatrixDev]

I tried this code:

// build.rs
println!("cargo:rustc-link-search=framework=../../Frameworks/MacOS/Banuba/bnb-0.37.1/iOS/");
println!("cargo:rustc-link-lib=framework=BNBEffectPlayerC");

Folder structure (with frameworks):

- Frameworks/MacOS/Banuba/bnb-0.37.1/iOS
  - BNBEffectPlayerC.xcframework
    - ios-arm64
      - BNBEffectPlayerC.framework
    - ios-arm64_x86_64-simulator
      - BNBEffectPlayerC.framework
    - Info.plist

Expected behavior

I expected for the program to successfully link with BNBEffectPlayerC library and automatically select correct 'sub-framework' based on the build target. Something like this:

• aarch64-apple-ios => ios-arm64
• aarch64-apple-ios-sim => ios-arm64_x86_64-simulator
• x86_64-apple-ios => ios-arm64_x86_64-simulator

Actual behavior

Instead, linking fails with following error:

cargo build --release --target aarch64-apple-ios
   Compiling banuba v0.1.0 (/Users/oleksandr/banuba-rs)
error: linking with `cc` failed: exit status: 1
  = note: "cc" "-Wl, {tons and tons of arguments}
  = note: ld: framework not found BNBEffectPlayerC
          clang: error: linker command failed with exit code 1 (use -v to see invocation)

Workaround

Following workaround is ugly and to properly implement it we should parse Info.plist to select correct framework but it will require much more effort:

// build.rs
let is_simulator = env::var("TARGET").unwrap() == "aarch64-apple-ios-sim" || target == "x86_64-apple-ios";
let framework_folder = match is_simulator {
    true => "ios-arm64_x86_64-simulator",
    false => "ios-arm64",
};
println!("cargo:rustc-link-search=framework=../../Frameworks/MacOS/Banuba/bnb-0.37.1/iOS/BNBEffectPlayerC.xcframework/{}", framework_folder);
println!("cargo:rustc-link-lib=framework=BNBEffectPlayerC");

Proposed solution

Maybe it whould be better to add one more linking variant, something like xcframework?

// build.rs
println!("cargo:rustc-link-search=xcframework=../../Frameworks/MacOS/Banuba/bnb-0.37.1/iOS/");
println!("cargo:rustc-link-lib=xcframework=BNBEffectPlayerC");

Meta

rustc --version --verbose:

rustc 1.66.0 (69f9c33d7 2022-12-12)
binary: rustc
commit-hash: 69f9c33d71c871fc16ac445211281c6e7a340943
commit-date: 2022-12-12
host: aarch64-apple-darwin
release: 1.66.0
LLVM version: 15.0.2