To clarify the CLA bit, we're not asking musl authors to sign the Google CLA. Instead, what we proposed was coming up with a CLA specifically for musl. Since someone, in this case most likely Rich as the project maintainer, has to re-license the files which are currently in public domain, one way is to have the past contributors sign a "musl project" CLA as a way to keep a track of the legal permission to use and distribute these files. However, this is a decision of the musl community and how you do the re-licensing is up to you, as long as you have the permission to re-license the files in question.