160000 commit 5794e96eb8bae47bb48feee915d99583573b3887	build-tools
040000 tree 64fefc15c4b26c291e729f3059822e85f747fe04	clang
040000 tree d997b6723dbfd89cb401eb19b31a417aee9f1404	gcc
160000 commit 10812113a483a5ea697c65e1135cb543532141b5	libprotobuf