Re: [Caml-list] Dependencies between plugins

[Ivan Gotovchits <ivg@ieee.org>]

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Are there any movement in this direction, or this patches will die?

On Wed, Mar 4, 2015 at 4:58 AM, François Bobot <francois.bobot@cea.fr>
wrote:

> On 03/03/2015 15:55, Gerd Stolpmann wrote:
>
>> Am Dienstag, den 03.03.2015, 14:15 +0100 schrieb François Bobot:
>>
>>> Gerd, do you think that something that does that could be added to
>>> ocamlfind? One tricky thing is to
>>> know the library statically linked (ie. `Ocsigen_config.builtin_packages`),
>>> perhaps ocamlfind can
>>> during linking add this information.
>>>
>>
>> I think so. For toploops, there is already code that tracks libraries
>> already linked into the executable (i.e. if you ocamlmktop your
>> toploop).
>>
>
> All was already in place indeed! It was easy to add. I kept caml-list in
> CC for discussing the big picture in order to get comments from people. Is
> mail still your preferred way of receiving patch?
>
> I kept it simple, no hack (no automatic: cmxa -> cmxs) because I prefer
> problems in library META to be found than to be paper over.
>
> The first patch adds:
> - A library `findlib.dynlink` that depends on `findlib` and `dynlink`
> - During linking (using `ocamlfind ocaml*`) if `-package findlib.dynlink`
> and `-linkpkg` are used then a module `Findlib_initl...` is linked after
> all packages and it stores the names of packages linked in
> `Findlib.linked_packages`.
> - In the main program `Fl_dynlink.load_packages ["yojson"]` can be used to
> dynlink packages
>
> The second patch forbids to run `Fl_dynlink.load_packages` during the
> initialization of packages (statically or dynamically linked), because
> `Findlib_initl...` is not yet run and because if you want to load a package
> that depend on a statically linked package not yet initialized, there is no
> sane semantic.
>
> Problems:
> - The package is named `findlib.dynlink`, the archive `findlib_dynlink.cm*`
> and the module `Fl_dynlink` ...
> - If you don't use `-linkall` static packages could only be partially
> linked, and you can't link the remaining part later. So perhaps `-linkall`
> must be automatically added if `findlib.dynlink` is used.
> - If you define `archive(native)` and not `archive(native,plugin)` the
> error is not nice (in Dynlink.Error). Perhaps I should add a
> `Package_not_dynamically_loadable of string` error, that should catch the
> loading of something else than `*.cmxs`.
> - Often you link your binary with your own library without using
> `-package` (the library is not yet installed), and plugins for your tools
> depend on your library. Currently you should do before any
> `Fl_dynlink.load_packages`: `Findlib.linked_packages :=
> "mylib"::Findlib.linked_packages`. For simplicity, I don't know if I
> should add a function `Fl_dynlink.add_linked_packages`, or an option to
> ocamlfind `-additional-package-statically-linked `.
> - During the initialization of your own library (linked without -package)
> you should not use `Fl_dynlink.load_packages`, but the library doesn't
> protect you against this error.
>
> Choices:
> - If you don't link with `findlib.dynlink` or use `create_toploop`, the
> variables `Findlib.linked_packages` and `Findlib.linked_predicates` are
> empty because I don't wanted to add backward change by adding
> `Findlib_initl...` when `findlib` is linked.
>
>
> Remains to do:
> - Fix problems
> - Documentations (add `plugin` in the list of standard predicates, ...)
>
>
> Gerg, what do you think of this first version of the patch? Of the way to
> fix the problems?
>
> Thanks,
>
>
> Regards,
>
> --
> François
>
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