Ok just read their whitepaper, they use LLVM for ARM compilation only. still using their old compiler for Windows/OSX.
I don't know why they didn't carry on using FPC, for some bizarre reason they've chosen one open source compiler chain (LLVM) over another (FPC) using open source as a justification for doing so.
They took an already tested solution (FPC) and replaced it with a a new solution, for no good reason whatsoever.
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