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Since dune 3.25 the ctypes stub generation runs in a sandbox that only
contains the dependencies the stanza declares, and hdr_histogram.h is a
target of the cmake rule rather than a source file, so the type probe
no longer finds it:
fatal error: hdr_histogram.h: No such file or directory
More context can be found at ocaml/dune#16834
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Since dune 3.25 (ocaml/dune#16223, release in progress) the ctypes stub
generation runs in a sandbox and only sees the dependencies declared in the
ctypesfield.hdr_histogram.his produced by the cmake rule inlib/dunerather than being a source file, so building with dune 3.25.0~alpha0 fails at
the type probe:
This adds the required
(deps hdr_histogram.h)to the stanza.The requirement for this dependency specification is documented at
https://dune.readthedocs.io/en/stable/foreign-code.html#stub-generation-with-dune-ctypes
Diagnosed by @Alizter in ocaml/dune#16834 .