Add comment about the problem, and use provided path if available
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@@ -155,11 +155,18 @@ impl Step for Llvm {
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.define("WITH_POLLY", "OFF")
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.define("WITH_POLLY", "OFF")
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.define("LLVM_ENABLE_TERMINFO", "OFF")
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.define("LLVM_ENABLE_TERMINFO", "OFF")
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.define("LLVM_ENABLE_LIBEDIT", "OFF")
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.define("LLVM_ENABLE_LIBEDIT", "OFF")
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.define("LLVM_OCAML_INSTALL_PATH", "usr/lib/ocaml")
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.define("LLVM_PARALLEL_COMPILE_JOBS", build.jobs().to_string())
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.define("LLVM_PARALLEL_COMPILE_JOBS", build.jobs().to_string())
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.define("LLVM_TARGET_ARCH", target.split('-').next().unwrap())
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.define("LLVM_TARGET_ARCH", target.split('-').next().unwrap())
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.define("LLVM_DEFAULT_TARGET_TRIPLE", target);
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.define("LLVM_DEFAULT_TARGET_TRIPLE", target);
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// By default, LLVM will automatically find OCaml and, if it finds it,
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// install the LLVM bindings in LLVM_OCAML_INSTALL_PATH, which defaults
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// to /usr/bin/ocaml.
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// This causes problem for non-root builds of Rust. Side-step the issue
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// by setting LLVM_OCAML_INSTALL_PATH to a relative path, so it installs
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// in the prefix.
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cfg.define("LLVM_OCAML_INSTALL_PATH",
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env::var_os("LLVM_OCAML_INSTALL_PATH").unwrap_or_else(|| "usr/lib/ocaml".into()));
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// This setting makes the LLVM tools link to the dynamic LLVM library,
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// This setting makes the LLVM tools link to the dynamic LLVM library,
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// which saves both memory during parallel links and overall disk space
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// which saves both memory during parallel links and overall disk space
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