Re: [Caml-list] Utop Difficulties with C callbacks

[Jeremie Dimino <jdimino@janestreet.com>]

On Thu, Mar 19, 2015 at 9:36 PM, Kenneth Adam Miller
<kennethadammiller@gmail.com> wrote:
> ocamlfind ocamlc -ccopt "-fPIC -DPIC -shared -DNATIVE_CODE  -o
> piqi_c_impl.so " piqi_c_impl.c

I don't think this command will do what you expect. You can use
ocamlmklib instead:

  ocamlfind ocamlmklib -o piqilib_stubs piqi_c_impl.o

This will create dllpiqilib_stubs.so and libpiqilib_stubs.a. You can
use -verbose to see what it is running. You need to install the
dllpiqilib_stubs.so file with ocamlfind as well, it will put it where
ocamlrun can find it.

> ocamlfind ocamlc -a -custom             -dllib piqilib_stubs    -o
> piqilib.cma piqi_version.cmo piqi_piqirun.cmo piqi_piqi.cmo piqloc.cmo
> piqi_util.cmo piq_ast.cmo piqi_impl_piqi.cmo piqi_boot.cmo piqi_c.cmo
> piqi_config.cmo piqi_iolist.cmo piqi_name.cmo piqi_common.cmo piqi_file.cmo
> piqi_command.cmo piqi_protobuf.cmo piqi_db.cmo piq_lexer.cmo piq_parser.cmo
> piq_gen.cmo piqi_objstore.cmo piqobj.cmo piqobj_common.cmo
> piqobj_to_protobuf.cmo piqobj_of_protobuf.cmo piqobj_to_piq.cmo
> piqobj_of_piq.cmo piq.cmo piqi.cmo piqi_pp.cmo piqi_json_parser.cmo
> piqi_json_gen.cmo piqi_json.cmo piqi_base64.cmo piqobj_to_json.cmo
> piqobj_of_json.cmo piqi_xml.cmo piqobj_to_xml.cmo piqobj_of_xml.cmo
> piqi_convert.cmo piqi_compile.cmo piqi_light.cmo piqi_getopt.cmo
> cp piqi_c_impl.so piqilib_stubs.so
> utop -require mylib

AFAIK the only effect of -custom on a library is to require -custom
linking when linking an executable, so you probably don't want it
here. You should also keep the -cclib for when you do want to link a
custom executable. In the end it should look like this:

  ocamlfind ocamlc -a -cclib -lpiqilib_stubs -dllib -lpiqilib_stubs -o
piqilib.cma <cmo files>

-- 
Jeremie