Re: [Caml-list] parmap package broken in opam switch 4.03.0

[Roberto Di Cosmo <roberto@dicosmo.org>]

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Indeed, after some more investigation (thanks to Francois Berenger), it
seems that in 4.03 we can no longer just use a bare .mli file with the
interface to some external code, as it was possible before.

Now, we need to provide also an .ml file, in any case.

The fix in parmap is underway, and it was a simple matter of moving
setcore.mli to setcore.ml, without touching anything else.

For the curious, the content of setcore.ml (ex setcore.mli) is the
following:

(* uses the native affinity interface to
  declare that the current process should be
  attached to core number n *)

external numcores: unit -> int = "numcores"
external setcore: int -> unit = "setcore"

If you have similar patterns in your projects, take due notice :-)

--
Roberto


2016-04-26 19:16 GMT+02:00 Leo White <leo@lpw25.net>:

> > It seems that in 4.03 one needs to add the -opaque flag when compiling
> > such stubs, otherwise things go astray, and it seems ocamlbuild does not
> > detect automatically such situations, so one needs to explicitly pass
> > the -opaque option when compiling setcore.mli (and only it).
>
> I would not have thought that adding `-opaque` would be sufficient. It
> should get you
> past the compilation of modules which depend on `setcore.mli`, but I would
> expect
> linking to fail still. If that is not the case I guess it should be
> considered a bug because
> in 4.03 referencing an `external` is supposed to force linking of the
> containing module.
> The change was made because the existing behaviour was said to confuse
> people --
> using a normal value from a module caused it to get linked whilst using an
> external value
> didn't.
>
> Regards,
>
> Leo
>
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-- 
Roberto Di Cosmo

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