Yes, this is for the Kythe (née Grok) team at Google. We build a giant cross reference graph of the codebase. So - most teams don't have to build the whole codebase, but the Kythe team does.
Here is a somewhat outdated talk given by our tech lead: https://www.youtube.com/watch?v=VYI3ji8aSM0. That doesn't really get into any of the CI/CD stuff though, I don't know what if any of that stuff is publicly shareable.
This talk is FASCINATING!
Not every organization maintains gigantic polyglot codebases, and it's interesting to see what kinds of challenges arise when that's the operational reality. I would never have realized the need for something like Kythe, because I largely work on codebases that are written in one language.
I feel like a lot of what you all are working on might one day osmose nicely into something CI systems and cloud-based analysis tools use to decouple themselves from individual language semantics - kind of like how MapReduce, Bazel, Kubernetes, et al found brand new use cases outside of Google's organization years after they were invented and instituted.
It is indeed a very interesting and somewhat unique problem space. Our current "killer feature" is simply powering the cross references for internal google code search / IDE / etc. But we're always thinking about ways to expand.
We are sort of trying to stuff it into CI/cloud stuff, though there are some hard problems around dealing with the enormous variety of build systems out there. It works okay in bazel/blaze, it can work for gradle or maven with a lot of work, and a few other systems. But, the amount of custom build tooling that projects use make it difficult to wire up the entrypoint for Kythe in a generic way.
Here is a somewhat outdated talk given by our tech lead: https://www.youtube.com/watch?v=VYI3ji8aSM0. That doesn't really get into any of the CI/CD stuff though, I don't know what if any of that stuff is publicly shareable.