[Caml-list] Including code from a .cm[ox] into another .cm[ox]

[Guillaume Yziquel]

Hello.

Imagine I have a file named a.ml containing

> module C = struct
> include B
> end

and a file named b.ml containing the code

> let f x = x + 1

When I compile everything to .cmo files, I cannot load a.cmo from the
toplevel without loading b.cmo beforehand.

Is there a way to make the 'include B' statement to include the code of
the B module in the C submodule directly so that it is not required to
load the b.cmo file before loading the a.cmo file?

That would be extremely useful to me...

All the best,

--
Guillaume Yziquel
http://yziquel.homelinux.org/

_______________________________________________
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

[Philippe Veber]

Hi

maybe you can have a look at findlib and its #require statement. For
instance, pxp (xml related library) depends on many cma, but everything
loads automagically when invoking #require :

Objective Caml version 3.11.1

# #use "topfind";;
- : unit = ()
Findlib has been successfully loaded. Additional directives:
#require "package";; to load a package
#list;; to list the available packages
#camlp4o;; to load camlp4 (standard syntax)
#camlp4r;; to load camlp4 (revised syntax)
#predicates "p,q,...";; to set these predicates
Topfind.reset();; to force that packages will be reloaded
#thread;; to enable threads

- : unit = ()
# #require "pxp";;
/home/pveber/usr/lib/godi/lib/ocaml/pkg-lib/pcre: added to search path
/home/pveber/usr/lib/godi/lib/ocaml/pkg-lib/pcre/pcre.cma: loaded
/home/pveber/usr/lib/godi/lib/ocaml/std-lib/unix.cma: loaded
/home/pveber/usr/lib/godi/lib/ocaml/pkg-lib/netsys: added to search path
/home/pveber/usr/lib/godi/lib/ocaml/pkg-lib/netsys/netsys.cma: loaded
/home/pveber/usr/lib/godi/lib/ocaml/pkg-lib/netstring: added to search path
[...]
/home/pveber/usr/lib/godi/lib/ocaml/pkg-lib/pxp-ulex-utf8/pxp_ulex_link_utf8.cmo:
loaded
/home/pveber/usr/lib/godi/lib/ocaml/pkg-lib/pxp: added to search path
# Pxp_document.liquefy;;
- : ?omit_end:bool ->
?omit_positions:bool ->
(< clone : 'a; node : 'a Pxp_document.node;
set_node : 'a Pxp_document.node -> unit; .. >
as 'a)
Pxp_document.solid_xml -> 'b -> Pxp_types.event option
= <fun>

hth,
ph.

2009/11/12 Guillaume Yziquel <guillaum...@citycable.ch>

[Philippe Veber]

You're right this is a linking issue and now the question is at which level
you want to "link" your code. I do not see the point of including a cmo in
another like you describe : i believe there are simpler and mainstream
options. Maybe I miss some details about your problem ? Using findlib to
help the linker is one way to do it, but if you insist on loading a single
module then you have two other options :
- code inclusion -> m4, camlmix, camlp4 or any preprocessor (not that ugly,
but still)
- the -pack option for combining several cmo in a single one (but then all
your modules are included in a "toplevel" module)
sorry if i still didn't get your problem ;o).
ph.

2009/11/12 Guillaume Yziquel <guillaum...@citycable.ch>

> Philippe Veber a �crit :

>
> Hi
>>
>> maybe you can have a look at findlib and its #require statement. For
>> instance, pxp (xml related library) depends on many cma, but everything
>> loads automagically when invoking #require :
>>
>

> No, no, no... this is not the issue at all. My issue is not about loading
> stuff with findlib, it's about including a .cmo into another .cmo. I'd like
> to create a .cma with only a.ml, and not containing b.ml.
>
> It's not a toplevel issue, but a 'linking' issue.
>
> Thanks anyway.
>
> Guillaume.
>
>
>
>
> 2009/11/12 Guillaume Yziquel <guillaum...@citycable.ch>

[Guillaume Yziquel]

Philippe Veber a écrit :

> You're right this is a linking issue and now the question is at which level
> you want to "link" your code. I do not see the point of including a cmo in
> another like you describe : i believe there are simpler and mainstream
> options. Maybe I miss some details about your problem ? Using findlib to
> help the linker is one way to do it, but if you insist on loading a single
> module then you have two other options :
> - code inclusion -> m4, camlmix, camlp4 or any preprocessor (not that ugly,
> but still)
> - the -pack option for combining several cmo in a single one (but then all
> your modules are included in a "toplevel" module)
> sorry if i still didn't get your problem ;o).
> ph.

You're getting my problem right. I'm working on the OCaml-R binding of
Maxence Guesdon.

The thing is, I have a r.ml file, where all the binding work is done.
However, in order to launch the shared library containing the code of
the R interpreter, some environment variables must be set up first.
Therefore I have a small R script, based on Dirk Eddelbuettel's littler
software, that generates an .ml file, rstdenv.ml, containing the
environment variables that need to be set up correctly.

Maybe it's trying to be a bit too pretty, but I do not like the name
Rstdenv for a module. I'd rather have R.Standard.env...

So I'm looking for a way to include a module as a submodule, without
having to link it to rstdenv.cmo, which I really do not want to be
available from the r.cma archive.

That's why I was wondering if there is a clean, camlish way, to
link-substitute code from one .cmo into another .cmo...

The -pack option is clearly overkill, camlp4 seems overkill too, m4 is
ugly, do not know camlmix. There's also a package from Gerd Stolpmann,
xstrp4 or something like that which could be useful. But as I want to
minimise dependencies on extra stuff, I was wondering if there was an
out-of-box obscure compiling option to do so.

All the best,

Guillaume Yziquel.

> 2009/11/12 Guillaume Yziquel <guillaum...@citycable.ch>
>
>> Philippe Veber a écrit :

_______________________________________________