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The opam patch makes ocaml link dependent executables with -L${LLVM_OCAML_EXTERNAL_LLVM_LIBDIR}. This variable was previously undefined and as a result the linker would previously be called with just -L which makes it ignore the next argument. This would lead strange linking errors, like missing caml_apply2. Despite defining this variable correctly, propagating llvm is still necessary for linking to complete. In case ocaml-llvm is a transitive dependency only, propagatedBuildInputs is not enough. To avoid having to guess which version of llvm was used, we provide the right one in passthrough. |
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