def get_all_compile_args(self) -> T.List[str]:
        """Get the compile arguments from this dependency and its sub dependencies."""
        return list(itertools.chain(self.get_compile_args(),
                                    *(d.get_all_compile_args() for d in self.ext_deps)))
Get the compile arguments from this dependency and its sub dependencies.
mesonbuild/dependencies/base.py