Re: [Caml-list] Creating an OPAM package that wraps c functions that can be used in a non-custom utop

["Daniel Bünzli" <daniel.buenzli@erratique.ch>]

Le mercredi, 26 février 2014 à 22:49, Mads Hartmann Jensen a écrit :

> Thanks for your help so far. I think I've gotten further but I'm not
> quite there yet. I've followed the instructions that were outlined in  
> the ocaml-ctypes issue and I've also created a META and .install file.

First if your opam package name is called ocaml-geoip that file must be called `ocaml-geoip.install` not `.install`. What you need to build is everything you want to install through the .install file. So just make a target `pkg` in your Makefile as follows:

    pkg:
        ocamlbuild -use-ocamlfind tgeoip.{mli,cmi,cmx,cma,a,cmxa,cmxs} dlltgeoip.so META

you may need to add `<src> : include` to your `_tags` file and I'm no longer sure if Makefile supports globbing as above. Verify that after a `make pkg` you have all the build artefacts mentioned in the .install file build at that place.

I don't see your `opam` file (add one at the toplevel of the project, this allows opam to use this opam file when you pin the package which can be useful when you want people to test for fixes and that your deps or build procedure has changed) but the build section should then read:

    build:  
    [
    [ "make" "pkg"]
    ]

That's all, no need to have a `remove` section, since you are using a .install file. After having executed this make invocation, opam will use the file ocaml-geoip.install to copy the files you built at the right places. See the opam developer manual [1] for more information about .install files.  
  
> I tried running `ocamlfind install tgeoip META` to install the package
> but that just copied the meta file to  
> /Users/hartmann/.opam/issuu/lib/tgeoip/META.

If you run ocamlfind by yourself you need to specify each file you want to install (basically those that are in the .install file) so that would be:

ocamlfind install tgeoip META _build/tgeoip.{mli,cmi,cmx,cma,a,cmxa,cmxs} _build/dlltgeoip.so  

See `man ocamlfind`,

Best,

Daniel

[1] https://github.com/OCamlPro/opam/raw/master/doc/dev-manual/dev-manual.pdf