build_ffi.sh fails on Apple-Silicon simulator (aarch64-apple-ios-sim)

[ehsunahmadi]

when running command CARGO_BUILD_TARGET=aarch64-apple-ios-sim swift/build_ffi.sh --release
i get the error:

 thread 'main' panicked at /Users/ehsanahmadi/.cargo/git/checkouts/boring-8e0653be29ac08c9/bb42da5/boring-sys/build/main.rs:787:39:
  Unable to generate bindings: ClangDiagnostic("error: version 'sim' in target triple 'arm64-apple-ios-sim' is invalid\n")

Environment:
libsignal tag: 0.71.0

macOS: Sequia (15.4.1)

Xcode: 16.3

Rust: 1.87.0-nightly

rustup target list --installed result includes aarch64-apple-ios-sim

[akonradi-signal]

That's surprising since the iOS build job for the release built successfully. Looking around a bit, this seems to not be libsignal-specific; aws/aws-lc-rs#761, for instance, tracks a similar issue and has some suggested workarounds.

libsignal's usage of bindgen is indirect through https://github.com/signalapp/boring but if you point libsignal at a local checkout of the boring fork that overrides the bindgen dependency to point at the current https://github.com/rust-lang/rust-bindgen main branch it should build.

[ehsunahmadi]

thanks for the ref. the build is successful after pointing boring to the latest rust-bindgen