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Unused libs runtime deps #12786

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Nov 25, 2025
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Unused libs runtime deps #12786

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dev
rgrinberg Oct 15, 2025
f322896
test: unused-libs and ppx runtime deps
rgrinberg Nov 24, 2025
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39 changes: 39 additions & 0 deletions test/blackbox-tests/test-cases/unused-libs/unused-libs-ppx-runtime-deps.t
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Original file line number Diff line number Diff line change
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Demonstrate ppx_runtime_deps issues

$ cat >dune-project <<EOF
> (lang dune 3.21)
> EOF

$ cat >dune <<EOF
> (library
> (modules ())
> (name runtime))
> (library
> (name foo)
> (modules ())
> (kind ppx_rewriter)
> (ppx_runtime_libraries runtime)
> (libraries compiler-libs.common)
> (ppx.driver (main "\| (fun () ->
> "\| output_string (open_out "use/use.pp.ml") "let () = ()")
> )))
> EOF

$ mkdir use
$ cat >use/dune <<EOF
> (executable
> (name use)
> (preprocess (pps foo)))
> EOF
$ cat >use/use.ml <<EOF
> let () = ()
> EOF

$ dune build @use/unused-libs
File "use/dune", lines 1-3, characters 0-48:
1 | (executable
2 | (name use)
3 | (preprocess (pps foo)))
Error: Unused libraries:
- runtime
[1]
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