Fix ORT linking for macOS cross-builds.

crates/bds-release/src/main.rs

@@ -8,6 +8,9 @@ fn main() -> Result<(), Box<dyn Error>> {
     match args.as_slice() {
         [command] if command == "prepare" => gitea::prepare(),
         [command] if command == "publish" => gitea::publish(),
+        [command, directory] if command == "macos-linker-alias" => {
+            packaging::prepare_macos_linker_alias(Path::new(directory))
+        }
         [command, paths @ ..] if command == "upload" && !paths.is_empty() => {
             gitea::upload(paths.iter().map(Path::new))
         }
@@ -36,7 +39,7 @@ fn main() -> Result<(), Box<dyn Error>> {
             gitea::upload(assets.iter().map(|path| path.as_path()))
         }
         _ => Err(
-            "usage: bds-release prepare|publish|upload <asset>...|package <tag> <release-dir> <rust-lib-dir> <platform> <dist-dir> [--upload]"
+            "usage: bds-release prepare|publish|macos-linker-alias <directory>|upload <asset>...|package <tag> <release-dir> <rust-lib-dir> <platform> <dist-dir> [--upload]"
                 .into(),
         ),
     }

crates/bds-release/src/packaging.rs

@@ -24,6 +24,12 @@ const LC_REEXPORT_DYLIB: u32 = 0x8000_001f;
 const LC_LAZY_LOAD_DYLIB: u32 = 0x20;
 const LC_LOAD_UPWARD_DYLIB: u32 = 0x8000_0023;
 
+pub(crate) fn prepare_macos_linker_alias(directory: &Path) -> Result<(), Box<dyn Error>> {
+    fs::create_dir_all(directory)?;
+    fs::write(directory.join("libclang_rt.osx.a"), b"!<arch>\n")?;
+    Ok(())
+}
+
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
 enum Platform {
     MacOs,
@@ -460,6 +466,17 @@ mod tests {
         assert_eq!(dmg_sectors(1).unwrap(), 131_072);
     }
 
+    #[test]
+    fn macos_cross_linker_alias_is_an_empty_static_archive() {
+        let temp = tempdir().unwrap();
+        prepare_macos_linker_alias(temp.path()).unwrap();
+
+        assert_eq!(
+            fs::read(temp.path().join("libclang_rt.osx.a")).unwrap(),
+            b"!<arch>\n"
+        );
+    }
+
     #[test]
     fn windows_package_contains_the_app_without_dynamic_std() {
         let temp = tempdir().unwrap();