MacOS & ARM64 support

This is for OpenDream.

macOS specifically just needs to be supported in the library loader code, by making it use the same dlopen() path as Linux.

byondapi.h does not support ARM64 properly due to missing #if statements for it. This leads to DM_64BIT not being set and u4c being miscompiled as a u64. I decided to just work around this by telling bindgen to add that define if the target is aarch64, instead of modifying the header files themselves.

Author: PJB3005

crates/byondapi-rs/src/static_global.rs

@@ -23,7 +23,7 @@ fn init_lib() -> byondapi_sys::ByondApi {
         .expect("Failed to initialize library.")
 }
 
-#[cfg(target_os = "linux")]
+#[cfg(any(target_os = "linux", target_os = "macos"))]
 fn init_lib() -> byondapi_sys::ByondApi {
     for func in inventory::iter::<super::InitFunc> {
         func.0();

crates/byondapi-sys/build.rs

@@ -44,14 +44,17 @@ fn copy_wrapper(lib_dir: &Path) -> PathBuf {
 fn generate_all() {
     let out_dir = PathBuf::from(std::env::var("OUT_DIR").expect("OUT_DIR not defined"));
 
+    let target_triple = std::env::var("TARGET").unwrap_or("".into());
+    let is_64_bit = target_triple.starts_with("aarch64");
+
     get_headers()
         .into_iter()
         .for_each(|(path, (major, minor))| {
             let target = out_dir.join("byondapi.h");
             std::fs::copy(path, target).expect("Failed to copy to out_dir");
             let wrapper = copy_wrapper(&out_dir);
 
-            let builder = bindgen::Builder::default()
+            let mut builder = bindgen::Builder::default()
                 .header(wrapper.to_string_lossy())
                 .dynamic_library_name("ByondApi")
                 .dynamic_link_require_all(true)
@@ -60,6 +63,10 @@ fn generate_all() {
                 .parse_callbacks(Box::new(bindgen::CargoCallbacks::new()))
                 .parse_callbacks(Box::new(DoxygenCallbacks));
 
+            if is_64_bit {
+                builder = builder.clang_arg("-DDM_64BIT")
+            }
+
             builder
                 .generate()
                 .expect("Unable to generate bindings")