Added ios support

Author: simlay

.travis.yml

@@ -18,3 +18,4 @@ script:
 - if [ "$TRAVIS_OS_NAME" = linux ]; then curl -sL https://github.com/phracker/MacOSX-SDKs/releases/download/10.13/MacOSX10.13.sdk.tar.xz | tar -Jxf -; export COREAUDIO_SDK_PATH="$PWD/MacOSX10.13.sdk"; fi
 - RUSTFMT=rustfmt cargo build --verbose --target=x86_64-apple-darwin
 - if [ "$TRAVIS_OS_NAME" = osx ]; then RUSTFMT=rustfmt cargo test --verbose; fi
+- if [ "$TRAVIS_OS_NAME" = osx ]; then rustup target add aarch64-apple-ios armv7-apple-ios armv7s-apple-ios; for i in aarch64-apple-ios armv7-apple-ios armv7s-apple-ios; do RUSTFMT=rustfmt cargo build --verbose --target=$i; done; fi

build.rs

@@ -54,7 +54,12 @@ fn build(sdk_path: Option<&str>, target: &str) {
     #[cfg(feature = "core_audio")]
     {
         println!("cargo:rustc-link-lib=framework=CoreAudio");
-        headers.push("CoreAudio/CoreAudio.h");
+
+        if target.contains("apple-ios") {
+            headers.push("CoreAudio/CoreAudioTypes.h");
+        } else {
+            headers.push("CoreAudio/CoreAudio.h");
+        }
     }
 
     #[cfg(feature = "open_al")]
@@ -79,7 +84,14 @@ fn build(sdk_path: Option<&str>, target: &str) {
     // Begin building the bindgen params.
     let mut builder = bindgen::Builder::default();
 
-    builder = builder.clang_args(&[&format!("--target={}", target)]);
+    if target == "aarch64-apple-ios" {
+        // 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.
+        builder = builder.clang_args(&[&format!("--target={}", "arm64-apple-ios")]);
+    } else {
+        builder = builder.clang_args(&[&format!("--target={}", target)]);
+    }
 
     if let Some(sdk_path) = sdk_path {
         builder = builder.clang_args(&["-isysroot", sdk_path]);