160000 commit 1977a48004500e4ac1969eac749b27bbdbec2f37	build-tools
040000 tree da8373caa60fd3b51530047ef9e901e8addfc832	clang
040000 tree a0907986aaff58ed0f30f7241de5a4f496ae034d	gcc
160000 commit 10812113a483a5ea697c65e1135cb543532141b5	libprotobuf
160000 commit 97b8b051982b3a0e924c462ec66b2d4d45392676	rust