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Diffstat (limited to 'third_party/rust/coreaudio-sys/build.rs')
| -rw-r--r-- | third_party/rust/coreaudio-sys/build.rs | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/third_party/rust/coreaudio-sys/build.rs b/third_party/rust/coreaudio-sys/build.rs new file mode 100644 index 0000000000..81cfbcc855 --- /dev/null +++ b/third_party/rust/coreaudio-sys/build.rs @@ -0,0 +1,166 @@ +extern crate bindgen; + +fn sdk_path(target: &str) -> Result<String, std::io::Error> { + // Use environment variable if set + println!("cargo:rerun-if-env-changed=COREAUDIO_SDK_PATH"); + if let Ok(path) = std::env::var("COREAUDIO_SDK_PATH") { + return Ok(path); + } + + use std::process::Command; + + let sdk = if target.contains("apple-darwin") { + "macosx" + } else if target == "x86_64-apple-ios" + || target == "i386-apple-ios" + || target == "aarch64-apple-ios-sim" + { + "iphonesimulator" + } else if target == "aarch64-apple-ios" + || target == "armv7-apple-ios" + || target == "armv7s-apple-ios" + { + "iphoneos" + } else { + unreachable!(); + }; + let output = Command::new("xcrun") + .args(&["--sdk", sdk, "--show-sdk-path"]) + .output()? + .stdout; + let prefix_str = std::str::from_utf8(&output).expect("invalid output from `xcrun`"); + Ok(prefix_str.trim_end().to_string()) +} + +fn build(sdk_path: Option<&str>, target: &str) { + // Generate one large set of bindings for all frameworks. + // + // We do this rather than generating a module per framework as some frameworks depend on other + // frameworks and in turn share types. To ensure all types are compatible across each + // framework, we feed all headers to bindgen at once. + // + // Only link to each framework and include their headers if their features are enabled and they + // are available on the target os. + + use std::env; + use std::path::PathBuf; + + let mut headers: Vec<&'static str> = vec![]; + + #[cfg(feature = "audio_unit")] + { + // Since iOS 10.0 and macOS 10.12, all the functionality in AudioUnit + // moved to AudioToolbox, and the AudioUnit headers have been simple + // wrappers ever since. + if target.contains("apple-ios") { + // On iOS, the AudioUnit framework does not have (and never had) an + // actual dylib to link to, it is just a few header files. + // The AudioToolbox framework contains the symbols instead. + println!("cargo:rustc-link-lib=framework=AudioToolbox"); + } else { + // On macOS, the symbols are present in the AudioToolbox framework, + // but only on macOS 10.12 and above. + // + // However, unlike on iOS, the AudioUnit framework on macOS + // contains a dylib with the desired symbols, that we can link to + // (in later versions just re-exports from AudioToolbox). + println!("cargo:rustc-link-lib=framework=AudioUnit"); + } + headers.push("AudioUnit/AudioUnit.h"); + } + + #[cfg(feature = "audio_toolbox")] + { + println!("cargo:rustc-link-lib=framework=AudioToolbox"); + headers.push("AudioToolbox/AudioToolbox.h"); + } + + #[cfg(feature = "core_audio")] + { + println!("cargo:rustc-link-lib=framework=CoreAudio"); + + if target.contains("apple-ios") { + headers.push("CoreAudio/CoreAudioTypes.h"); + } else { + headers.push("CoreAudio/CoreAudio.h"); + } + } + + #[cfg(feature = "open_al")] + { + println!("cargo:rustc-link-lib=framework=OpenAL"); + headers.push("OpenAL/al.h"); + headers.push("OpenAL/alc.h"); + } + + #[cfg(all(feature = "core_midi"))] + { + if target.contains("apple-darwin") { + println!("cargo:rustc-link-lib=framework=CoreMIDI"); + headers.push("CoreMIDI/CoreMIDI.h"); + } + } + + println!("cargo:rerun-if-env-changed=BINDGEN_EXTRA_CLANG_ARGS"); + // Get the cargo out directory. + let out_dir = PathBuf::from(env::var("OUT_DIR").expect("env variable OUT_DIR not found")); + + // Begin building the bindgen params. + let mut builder = bindgen::Builder::default(); + + // See https://github.com/rust-lang/rust-bindgen/issues/1211 + // Technically according to the llvm mailing list, the argument to clang here should be + // -arch arm64 but it looks cleaner to just change the target. + let target = if target == "aarch64-apple-ios" { + "arm64-apple-ios" + } else if target == "aarch64-apple-darwin" { + "arm64-apple-darwin" + } else { + target + }; + builder = builder.size_t_is_usize(true); + + builder = builder.clang_args(&[&format!("--target={}", target)]); + + if let Some(sdk_path) = sdk_path { + builder = builder.clang_args(&["-isysroot", sdk_path]); + } + if target.contains("apple-ios") { + // time.h as has a variable called timezone that conflicts with some of the objective-c + // calls from NSCalendar.h in the Foundation framework. This removes that one variable. + builder = builder.blocklist_item("timezone"); + builder = builder.blocklist_item("objc_object"); + } + + // bindgen produces alignment tests that cause undefined behavior in some cases. + // This seems to happen across all apple target tripples :/. + // https://github.com/rust-lang/rust-bindgen/issues/1651 + builder = builder.layout_tests(false); + + let meta_header: Vec<_> = headers + .iter() + .map(|h| format!("#include <{}>\n", h)) + .collect(); + + builder = builder.header_contents("coreaudio.h", &meta_header.concat()); + + // Generate the bindings. + builder = builder.trust_clang_mangling(false).derive_default(true); + + let bindings = builder.generate().expect("unable to generate bindings"); + + // Write them to the crate root. + bindings + .write_to_file(out_dir.join("coreaudio.rs")) + .expect("could not write bindings"); +} + +fn main() { + let target = std::env::var("TARGET").unwrap(); + if !(target.contains("apple-darwin") || target.contains("apple-ios")) { + panic!("coreaudio-sys requires macos or ios target"); + } + + let directory = sdk_path(&target).ok(); + build(directory.as_ref().map(String::as_ref), &target); +} |