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InfluxDB
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Before that, I had spent a bit of time working with QBE, which is much simpler and really easy to write a frontend for. I switched to libgccjit though, because I got frustrated with a few of the things lacking from QBE (like the ability to easily keep track of where different variables live on the stack). I think for many hobby language projects, QBE would be a good option (my project was off the ground very fast using QBE, and I got pretty far before I ran into limitations I couldn't easily work around).
An alternative: LibFirm but it's much simpler and feature-poor.
As far as I know, there is QBE, which is actually kinda underrated, and Cranelift, mainly designed for JIT compilation