Re: [Caml-list] META file standards for native plugins

[Gabriel Scherer <gabriel.scherer@gmail.com>]

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I don't understand the problem with the current semantics. The .cmxs will
be linked when both predicates "archive" and "plugin" are true, and that
seems correct to me (we use this when we want to link a *plugin* inside a
*native* program). This is consistent with the use for example of
(syntax,preprocessor,camlp4o) and (syntax,preprocessor,camlp4r) to select
standard or revised syntax, or (syntax,toploop) when invoked from the
toplevel. Also many packages currently use archive(byte,plugin) as well
(which links to the .cma, just as with only archive(byte)).

On Thu, Apr 9, 2015 at 1:47 PM, François Bobot <francois.bobot@cea.fr>
wrote:

> Hi,
>
>         Another topic which need a standard is native dynamic plugins. In
> fact there is a defacto standard (used by some libraries and tools, but not
> specified in ocamlfind documentation) but it is a bad one.
>
>   archive(plugin,native) = "toto.cmxs"
>
> It is a bad one because the semantic of META file says that the value of
> `archive(native)` can be return when you ask the value of `archive` with
> the predicate `plugin` and the predicate `native` true.
>
> I discussed it with some people and the current proposition where
>
>   * archive(plugin_native)
>   * archive(plugin)
>   * archive(shared)
>
>
> I personally prefer the `shared` predicate because it corresponds to the
> `-shared` option of ocamlopt that creates `.cmxs`.
>
>  The predicate `shared` would be added to ocamlfind documentation. The
> prospective `ocamlfind check META` could recommend to add an
> `archive(shared)` if the `archive(native)` exists. For a transition period
> `archive(plugin,native)` and `archive(shared)` would be both present in the
> META.
>
>
> Thoughts or suggestions?
>
>
> Best regards,
>
> --
> François Bobot
>
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