Re: [Caml-list] Building a mixed C / OCaml static library to be used from C

[Gerd Stolpmann <info@gerd-stolpmann.de>]

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Am Donnerstag, den 22.08.2013, 18:34 +0100 schrieb John Whitington:
> Hi,
> 
> I have the following recipe to build a static library of C functions 
> from a mixed ocaml / c codebase. The idea is that the final linking step 
> to build target 'test' won't require any special flags:
> 
> 
> CAMLBASE = /Users/john/.opam/4.00.1/lib/
> 
> mklib: cpdflib.mli cpdflib.ml cpdflibwrapper.c
> 	ocamlfind ocamlc -package cpdf cpdflib.mli;
> 	ocamlfind ocamlopt -package cpdf -c cpdflib.ml;
> 	ocamlfind ocamlc cpdflibwrapper.c;
> 	ocamlfind ocamlopt -I $(CAMLBASE)cpdf -I $(CAMLBASE)camlpdf \
>            -output-obj -o cpdflib.o \
>            unix.cmxa bigarray.cmxa camlpdf.cmxa cpdf.cmxa cpdflib.cmx;
> 	ar -x $(CAMLBASE)camlpdf/libcamlpdf_stubs.a;
> 	ar -x $(CAMLBASE)ocaml/libasmrun.a;
> 	ar cr cpdflib.a *.o
> 
> test:   cpdflib.a cpdflibtest.c
> 	cc cpdflibtest.c cpdflib.a -o test\
>            -L $(CAMLBASE)ocaml -lbigarray -lunix
> 
> clean:
> 	rm __.SYMDEF\ SORTED *.o *.cmx *.cmi *.a test
> 
> 
> (Here, cpdflib.ml, cpdflib.mli and cpdflibwrapper.c form the C interface 
> to the OCaml functions. cpdflibtest.c calls caml_startup and then any 
> caml functions it likes).
> 
> This works. However, I'm having trouble getting rid of "-L 
> $(CAMLBASE)ocaml -lbigarray -lunix" -- i'd like the person linking with 
> my cpdflib.a not to need any dependencies at all.
> 
> When I add two more lines
> 
>          ar -x $(CAMLBASE)ocaml/bigarray.a;
>          ar -x $(CAMLBASE)ocaml/unix.a;

These are the wrong two libs. bigarray.a and unix.a are already
contained in cpdflib.a. What you need are libbigarray.a and libunix.a.

Gerd

> 
> in the obvious place and remove "-L $(CAMLBASE)ocaml -lbigarray -lunix" 
> when building the example, the linking fails, not being able to find the 
> symbols for unix and bigarray. ar -t confirms that bigarray.o, unix.o 
> and unixlabels.o are in the created cpdflib.a
> 
> Any ideas, or another recipe altogether?
> 
> Thanks,
> 
> -- 
> John Whitington
> Director, Coherent Graphics Ltd
> http://www.coherentpdf.com/
> 
> 

-- 
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Gerd Stolpmann, Darmstadt, Germany    gerd@gerd-stolpmann.de
My OCaml site:          http://www.camlcity.org
Contact details:        http://www.camlcity.org/contact.html
Company homepage:       http://www.gerd-stolpmann.de
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