[maxbond]

I can sympathize with that, I'm very particular about some elements of my workflow. But when you decide to go homegrown rather than turnkey, you do accept responsibility for maintenance. It also seems to me that you can call Cargo from cmake if you so desire.

I would be very surprised if changing the arguments to rustc (or the equivalent in any language) wasn't considered a breaking change, so I'm not sure how well founded your skepticism is. If it's poorly documented, that is a shame.