Dune and camlp4/camlp5 (actually, "dune and the -pp flag to ocamlc"

Ecosystem
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[up front: I’m not -complaining; rather, I’m just -verifying- that this is the current state of affairs.]
Hi, I’ve been digging around, and I can’t find any indication of support for camlp4/camlp5 in dune. To wit, I don’t find any indication of a way to specify “-syntax” to ocamlfind, nor a way to specify “-pp” to the ocamlc commandline.

Again: I can fully understand why these capabilities are not present; I just want to verify that that’s the case, and that I"m not overlooking something obvious.

ETA: ah, I see I can pass raw “-pp” flags to ocamlc. That’ll probably be enough for my purposes.

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I think you can consider it as a preprocess step and even enable it only on some files

  (preprocess
    (per_module
      ((action (run camlp4o %{input-file})) your_module)))
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Oh, nice! Thank you for the pointer! I’m not a dune user: I use makefiles and autoconf, b/c “too much C/C++ code in my projects”.

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In GT we needed some hacking to extract right ocamlfind options to substitute them to camlp5 call

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I’m curious what you meant by this. Can you explain a little? Perhaps you mean

when you have a compile-command that uses ocamlfind, and you want to instead produce the equivalent camlp5 command, you have to do a little work to figure out what arguments to camlp5 are required to get the same effect as what ocamlfind does internally.

Is that what you meant?

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yes, exactly. I can link you dune config scripts if you need this

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Oh, that’d be very useful. Thank you!

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you can look at this repo: https://github.com/kakadu/ocanren/tree/dune