Fix iOS bindings

build.rs

@@ -15,6 +15,25 @@ fn osx_version() -> Result<String, std::io::Error> {
     Ok(version.to_owned())
 }
 
+fn isysroot_path(platform: &str) -> Result<String, std::io::Error> {
+    use std::process::Command;
+
+    let output = Command::new("xcrun")
+        .arg("--sdk")
+        .arg(platform)
+        .arg("--show-sdk-path")
+        .output()?
+        .stdout;
+
+    let sdk_path =
+        std::str::from_utf8(&output).expect("invalid output from `xcrun --show-sdk-path`");
+    let directory = String::from(sdk_path.trim());
+
+    println!("SDK Directory: {}", directory);
+
+    Ok(directory)
+}
+
 fn parse_version(version: &str) -> Option<i32> {
     version
         .split(".")
@@ -23,7 +42,7 @@ fn parse_version(version: &str) -> Option<i32> {
         .and_then(|m| m.parse::<i32>().ok())
 }
 
-fn frameworks_path() -> Result<String, std::io::Error> {
+fn frameworks_path(platform: &str) -> Result<String, std::io::Error> {
     // For 10.13 and higher:
     //
     // While macOS has its system frameworks located at "/System/Library/Frameworks"
@@ -40,18 +59,13 @@ fn frameworks_path() -> Result<String, std::io::Error> {
         let prefix_str = std::str::from_utf8(&output).expect("invalid output from `xcode-select`");
         let prefix = prefix_str.trim_right();
 
-        let platform = if cfg!(target_os = "macos") {
-            "MacOSX"
-        } else if cfg!(target_os = "ios") {
-            "iPhoneOS"
-        } else {
-            unreachable!();
-        };
-
         let infix = if prefix == "/Library/Developer/CommandLineTools" {
             format!("SDKs/{}.sdk", platform)
         } else {
-            format!("Platforms/{}.platform/Developer/SDKs/{}.sdk", platform, platform)
+            format!(
+                "Platforms/{}.platform/Developer/SDKs/{}.sdk",
+                platform, platform
+            )
         };
 
         let suffix = "System/Library/Frameworks";
@@ -63,7 +77,7 @@ fn frameworks_path() -> Result<String, std::io::Error> {
     }
 }
 
-fn build(frameworks_path: &str) {
+fn build(frameworks_path: &str, sysroot: &str, platform: &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
@@ -97,7 +111,13 @@ fn build(frameworks_path: &str) {
     {
         println!("cargo:rustc-link-lib=framework=CoreAudio");
         frameworks.push("CoreAudio");
-        headers.push("CoreAudio.framework/Headers/CoreAudio.h");
+        match platform {
+            "MacOSX" => headers.push("CoreAudio.framework/Headers/CoreAudio.h"),
+            "iPhoneOS" | "iPhoneSimulator" => {
+                headers.push("CoreAudio.framework/Headers/CoreAudioTypes.h")
+            }
+            _ => unreachable!(),
+        }
     }
 
     #[cfg(feature = "open_al")]
@@ -110,9 +130,13 @@ fn build(frameworks_path: &str) {
 
     #[cfg(all(feature = "core_midi", target_os = "macos"))]
     {
-        println!("cargo:rustc-link-lib=framework=CoreMIDI");
-        frameworks.push("CoreMIDI");
-        headers.push("CoreMIDI.framework/Headers/CoreMIDI.h");
+        if (platform == "MacOSX") {
+            println!("cargo:rustc-link-lib=framework=CoreMIDI");
+            frameworks.push("CoreMIDI");
+            headers.push("CoreMIDI.framework/Headers/CoreMIDI.h");
+        } else {
+            panic!("framework CoreMIDI is not supported by Apple on this platform");
+        }
     }
 
     // Get the cargo out directory.
@@ -121,7 +145,10 @@ fn build(frameworks_path: &str) {
     // Begin building the bindgen params.
     let mut builder = bindgen::Builder::default();
 
-    builder = builder.clang_arg(format!("-F/{}", frameworks_path));
+    builder = builder
+        .clang_arg(format!("-F/{}", frameworks_path))
+        .clang_arg("-isysroot")
+        .clang_arg(sysroot);
 
     // Add all headers.
     for relative_path in headers {
@@ -137,6 +164,8 @@ fn build(frameworks_path: &str) {
 
     // Generate the bindings.
     let bindings = builder
+        .clang_arg("-target")
+        .clang_arg(target)
         .trust_clang_mangling(false)
         .derive_default(true)
         .rustfmt_bindings(false)
@@ -149,16 +178,28 @@ fn build(frameworks_path: &str) {
         .expect("could not write bindings");
 }
 
-#[cfg(any(target_os = "macos", target_os = "ios"))]
 fn main() {
-    if let Ok(directory) = frameworks_path() {
-        build(&directory);
+    let (target, platform) = match std::env::var("TARGET") {
+        Ok(val) => match val.as_ref() {
+            "x86_64-apple-darwin" | "i686-apple-darwin" => (val, "MacOSX"),
+            "aarch64-apple-ios" => (String::from("arm64-apple-ios"), "iPhoneOS"),
+            "armv7-apple-ios" | "armv7s-apple-ios" | "i386-apple-ios" | "x86_64-apple-ios" => {
+                (val, "iPhoneOS")
+            }
+            _ => panic!("coreaudio-sys requires macos or ios target. Found: {}", val),
+        },
+        Err(_e) => {
+            panic!("TARGET environment variable not found (are you running this outside of cargo?)")
+        }
+    };
+
+    if let Ok(directory) = frameworks_path(platform) {
+        if let Ok(sysroot) = isysroot_path(&platform.to_lowercase()) {
+            build(&directory, &sysroot, platform, &target);
+        } else {
+            eprintln!("coreaudio-sys could not find sysroot path");
+        }
     } else {
         eprintln!("coreaudio-sys could not find frameworks path");
     }
 }
-
-#[cfg(not(any(target_os = "macos", target_os = "ios")))]
-fn main() {
-    eprintln!("coreaudio-sys requires macos or ios target");
-}