Re: [Caml-list] ocamlbuild and c libraries

[Andrew Warshaver <awarshaver@janestcapital.com>]

Andrew Warshaver wrote:
> For the most part I tried to follow Nicolas's example on the previous 
> thread with similar name, but unfortunately I get an error that I do not 
> entirely understand.
> 
> My target is intern/live_query/live_query.native.  It uses an ocaml/c 
> library called jane that lives in janebase/lb (thanks Nicolas, for the 
> renaming tip).  In there exists a jane.mlpack, and a libjane.clib.  Also 
> there is a couple of _tags file:
> 
> $ cat janebase/lb/_tags
> <*.cmx>: for-pack(Jane)
> <*.cmo>: for-pack(Jane)
> <jane.cmx>: -for-pack(Jane)
> <jane.cmo>: -for-pack(Jane)
> <cephes>: include
> <jane.cm{x,}a>: use_libjane
> 
> $ cat intern/live_query/_tags
> <{single,live}_query.{byte,native}>: use_jane (i also tried 
> include_jane, this results in a different error message; in fact the 
> same error if I omit this _tags altogether, it says undefined references 
> in jane.o)
> 
> Also, myocamlbuild.ml :
> 
> $ cat myocamlbuild.ml
> open Ocamlbuild_plugin;;
> open Command;;
> 
> let packages = "bigarray,pcre,res,netstring"
> 
> let headers = ["janebase/lb/cephes/mconf.h"; 
> "janebase/lb/cephes/protos.h"];;
> 
> let ocamlfind cmd =
>   S [A "ocamlfind"; A cmd; A "-package"; A packages;
>      A "-I"; A "+camlp4"; A "-pp"; A "camlp4orf";
>      A "-pp"; A "camlp4o /home/awarshaver/multi-oc/lib/pa_type_conv.cmo 
> /home/awarshaver/multi-oc/lib/pa_sexp_conv.cmo"];;
> 
> flag ["ocaml"; "compile"] (A"-thread");;
> flag ["ocaml"; "link"; "program"] (S[A"-linkpkg"; A"-thread"]);;
> 
> dispatch begin function
>   | After_options ->
>       Options.ocamlc := ocamlfind "c";
>       Options.ocamlopt := ocamlfind "opt";
>       Options.ocamldep := ocamlfind "dep";
>   | After_rules ->
>       ocaml_lib "jane";
> 
>       flag ["link"; "library"; "ocaml"; "byte"; "use_libjane"]
>         (S[A"-dllib"; A"-ljane"; A"-cclib"; A"-ljane"]);
> 
>       flag ["link"; "library"; "ocaml"; "native"; "use_libjane"]
>         (S[A"-cclib"; A"-ljane"]);
> 
>       dep ["link"; "ocaml"; "use_libjane"] ["janebase/lb/libjane.a"];
> 
>       dep ["compile"; "c"] headers;
>   | _ -> ()
> end
> 
> I can build the library ok...
> 
> $ ocamlbuild janebase/lb/jane.cmxa
> + ocamlfind c -package bigarray,pcre,res,netstring -I +camlp4 -pp 
> camlp4orf -pp 'camlp4o /home/awarshaver/multi-oc/lib/pa_type_conv.cmo 
> /home/awarshaver/multi-oc/lib/pa_sexp_conv.cmo' -c 
> janebase/lb/cephes/main.c
> janebase/lb/cephes/main.c: In function ‘main’:
> janebase/lb/cephes/main.c:9: warning: control reaches end of non-void 
> function
> Finished, 286 targets (0 cached) in 00:01:12.
> 
> But not my target..
> 
> $ ocamlbuild intern/live_query/live_query.native
> Solver failed:
>   Ocamlbuild knows of no rules that apply to a target named jane.cmx. 
> This can happen if you ask Ocamlbuild to build a target with the wrong 
> extension (e.g. .opt instead of .native) or if the source files live in 
> directories that have not been specified as include directories.
> Backtrace:
>   - Failed to build the target intern/live_query/live_query.native
>       - Building intern/live_query/live_query.native:

So I think I know why this is bad, it thinks that jane lives in the root 
directory of my project.  This is probably a result of my line ocaml_lib 
"jane" in myocamlbuild.

Removing that, I'm not sure how I should specify to live_query.native 
that it needs to use jane.cmxa (otherwise, it seems to think it only 
needs jane.cmx).

>           - Building jane.a:
>               - Failed to build all of these:
>                   - Building jane.cmx
>                   - Building jane.mllib
> Compilation unsuccessful after building 358 targets (358 cached) in 
> 00:00:28.
> 
> Insights appreciated!
> 
> Thanks,
> Andrew
> 
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