040000 tree 898d1f4ce2ef6f729905dcde379288d88bd372be	cxx-file-extension-test
040000 tree a56b94cc2cab57602c01e162aefc294dbf389e45	objcxx-file-extension-test
040000 tree 4187a1ce15ea7c430847c1c3f88cb87b9618ee32	simple-build-test