Dune: Selecting library_flags based on OS type

[anton-trunov]

Is there an easy way to set library_flags when building on macOS but not doing that otherwise?
E.g. I'd like to express something like this

(library_flags
 (if (= %{os_type} macosx)
  (-cclib -Wl,-keep_dwarf_unwind)))

Thank you in advance.

[nojb]

You should be able to use (:include <filename>) (where <filename> can be generated by another rule), see https://jbuilder.readthedocs.io/en/latest/concepts.html#id2

[jeremiedimino]

We should probably add the (if ...) form though. Included files are a bit heavy for such cases

[anton-trunov]

Yes, please! I noticed that Dune has boolean constructors, but not boolean eliminators (at least not general ones).