Pure OCaml 4 programs still work with OCaml 5, but the FFI has a breaking change: naked pointers are no longer supported. The LLVM bindings use naked pointers, so I have been authoring a patch to replace the use of naked pointers so that the bindings work on OCaml 5. My patch currently passes the tests, so I feel optimistic, but it’s a lot of code to review.
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