Kythe

This document assumes that the latest release archive from https://github.com/kythe/kythe/releases has been unpacked into /opt/kythe/. See /opt/kythe/README.md for more information. Kythe uses Bazel to build itself and has implemented Bazel action_listener s that use Kythe's Java and C++ extractors. This effectively allows Bazel to extract each compilation as it is run during the build.