Re: [Caml-list] Static linking via Ctypes?

[Dan Benjamin <dbenjamin@janestreet.com>]

That does work, thanks very much.  Are there plans to add anything
similar to Ctypes?

On Tue, Mar 25, 2014 at 11:24 AM, David Sheets <sheets@alum.mit.edu> wrote:
> On Tue, Mar 25, 2014 at 3:11 PM, Dan Benjamin <dbenjamin@janestreet.com> wrote:
>> I am passing -force_load, as well as --whole-archive (in case that
>> makes a difference), and I have the following situation:
>>
>> - readelf -s shows that the function that I wish to call exists in the
>> executable
>> - running the executable results in Dl.DL_error("undefined symbol")
>> for the same function, corresponding to the line of code where I call
>> Foreign.foreign.
>>
>> Am I going about this wrongly?
>
> I did
>
> <https://github.com/dsheets/ocaml-unix-unistd/blob/master/lib/unix_unistd_stubs.c#L61>
>
> and
>
> <https://github.com/dsheets/ocaml-unix-unistd/blob/master/lib/ctypes/unix_unistd.ml#L32>
>
> to require a static link without stub generation in addition to
> ocamlmklib on the .ml and .o files.
>
> Unfortunately, this is not very portable (or sane). I believe that
> <https://github.com/ocamllabs/ocaml-ctypes/issues/96> may be related.
>
> Hope this helps,
>
> David
>
>> On Tue, Mar 25, 2014 at 11:04 AM, Bruno Deferrari <utizoc@gmail.com> wrote:
>>> On Tue, Mar 25, 2014 at 11:54 AM,  <dbenjamin@janestreet.com> wrote:
>>>> I'm using Ctypes to interface with a dynamic library, but in addition to the
>>>> interface provided the library I have some helper functions (written in C,
>>>> against the same library) that I'd also like to call via Ctypes.  Is there any
>>>> way to achieve this via static linking or am I required to build another
>>>> shared object?
>>>>
>>>
>>> Static linking works. I was in this same situation yesterday, and
>>> adding the .o files that were generated from C sources to the linking
>>> step did the trick.
>>>
>>> If you are trying to link a .a file, you may have to pass the
>>> -force_load option to the linker to force it to include it, otherwise
>>> it may see that none of the symbols there are being referenced
>>> directly and decide to not include it (this happened to me when using
>>> clang in OSX).
>>>
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>>>
>>>
>>> --
>>> BD
>>
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