in optee-utee-build/src/builder.rs [124:130]
fn link(&self, out_dir: PathBuf) -> Result<(), Error> {
let linker = match self.linker_type.as_ref() {
Option::Some(v) => Linker::new(v.clone()),
Option::None => Linker::auto(),
};
linker.link_all(out_dir)
}