Thank you. This does clarify some things. Everything works like clockwork after reworking things this way.
Based on the output of "ocamlc -verbose", it seems that if you pass "file.o" file to "ocamlc -a", it does nothing except remember the name "file.o" and pass it to gcc when the OCaml library is later used, which is a pretty useless and confusing behavior---in general, you will not be in the same directory that contains "file.o" when you use the OCaml library and I don't know of any gcc options that will make gcc look in other directories for object files. It would seem better for "ocamlc -a" to ignore ".o" files and display an appropriate warning. - Aaron On Mon, Jul 20, 2009 at 10:58 AM, <rabih.elch...@sgam.com> wrote: > I am not familiar with this specific library. > In the general approach, you compile your c code, and package it into a > library, let's say libA.a > > Then while building your sndfile.cma, you should pass the option > ocamlc -a -o sndfile.cma -cclib -lA ... > > A caml executable linked with your library will have also libA.a passed in > the linking phase. > > Using ocamlc -verbose could give you a hint to which files are missing. > > Hope this helps, > > Rabih > > -----Message d'origine----- > De : caml-list-boun...@yquem.inria.fr > [mailto:caml-list-boun...@yquem.inria.fr] De la part de Aaron Bohannon > Envoyé : lundi 20 juillet 2009 16:28 > À : caml-list@yquem.inria.fr > Objet : [Caml-list] how to use c wrapper files in libraries > > Hello, > > I am trying to use the wrapper for libsndfile contributed by Erik de > Castro Lopo (http://caml.inria.fr/cgi-bin/hump.en.cgi?contrib=556). > The wrapper code compiles just fine. And the tests that use the OCaml > library it builds work just fine. However, I am having a frustrating > compile-time error when I try to compile my program in a different > directory. > > The wrapper code is being packaged into an OCaml library using the > following command: > > ocamlc -a -o sndfile.cma -custom sndfile_stub.o sndfile.cmo \ > -ccopt -L/usr/local/lib -cclib -lsndfile > > Within the same directory, the test program can be successfully compiled with: > > ocamlc -o test_sndfile sndfile.cma test_sndfile.ml > > Within a different directory, I used: > > ocamlc -o mytest -I /path/to/libsndfile-ocaml/files/ sndfile.cma mytest.ml > > And I get: > > powerpc-apple-darwin8-gcc-4.0.1: sndfile_stub.o: No such file or directory > Error while building custom runtime system > > I have tried setting every path-related option I could find, and > nothing helped. I tried reading everything I could find about > compiling and using c wrappers for OCaml, but there is a severe lack > of documentation on the topic. In particular, I could find no example > of a c object file being given as an argument to an "ocamlc -a" > command, so I am not sure what that is supposed to do, which makes it > impossible for me to understand this error message. > > I am using OCaml 3.10.1 on OS X 10.4. Any help would be appreciated. > > - Aaron > > _______________________________________________ > Caml-list mailing list. Subscription management: > http://yquem.inria.fr/cgi-bin/mailman/listinfo/caml-list > Archives: http://caml.inria.fr > Beginner's list: http://groups.yahoo.com/group/ocaml_beginners > Bug reports: http://caml.inria.fr/bin/caml-bugs > This message and any attachments (the "message") are confidential, intended > solely for the addressee(s), and may contain legally privileged information. > Any unauthorised use or dissemination is prohibited. > E-mails are susceptible to alteration. > Neither Societe Generale Asset Management nor any of its subsidiaries or > affiliates shall be liable for the message if altered, changed or falsified. > > Find out more about Societe Generale Asset Management's proposal on > www.sgam.com > > ******** > > Ce message et toutes les pieces jointes (ci-apres le "message") sont > confidentiels et susceptibles de contenir des informations couvertes par le > secret professionnel. > Ce message est etabli a l'intention exclusive de ses destinataires. > Toute utilisation ou diffusion non autorisee est interdite. > Tout message electronique est susceptible d'alteration. Societe Generale > Asset Management et ses filiales declinent toute responsabilite au titre de > ce message s'il a ete altere, deforme ou falsifie. > > Decouvrez l'offre et les services de Societe Generale Asset Management sur le > site www.sgam.fr > > _______________________________________________ Caml-list mailing list. Subscription management: http://yquem.inria.fr/cgi-bin/mailman/listinfo/caml-list Archives: http://caml.inria.fr Beginner's list: http://groups.yahoo.com/group/ocaml_beginners Bug reports: http://caml.inria.fr/bin/caml-bugs
