fix linking with libc++abi on darwin with recent llvm

build.rs

@@ -1,4 +1,4 @@
-use std::path::PathBuf;
+use std::{path::PathBuf, ffi::OsString};
 // SPDX-License-Identifier: LGPL-3.0
 
 fn v(s: &str) -> versions::Versioning {
@@ -51,6 +51,12 @@ fn main() {
     };
     eprintln!("building with NIXVER={version}");
     builder.define("NIXVER", version.to_string().as_str());
+    let compiler = builder.get_compiler();
+    let compile_args = compiler.args();
+    if compile_args.contains(&OsString::from("-lc++")) {
+        // required for exception handlind with libc++
+        println!("cargo:rustc-link-lib=c++abi");
+    }
     builder.compile("libnix_adapter.a");
 
     let bindings = bindgen::Builder::default()