As identified in https://gerrit.cloudera.org/#/c/6165/ , it is not easy to know how (i.e. build flags) a toolchain build was produced. The build scripts are versioned in the native-toolchain repo, but that is not easily associated with generated toolchain builds. We should have some way to determine this information later. The simplest way to handle this may be to store the native-toolchain githash in the produced toolchain build.