From: Mauricio Fernandez <mfp@...>
Date: 2007-10-18T05:21:14+09:00
Subject: Re: rocaml 0.6.0: fast, easy Ruby extensions in Objective Caml

On Thu, Oct 18, 2007 at 04:48:13AM +0900, Daniel Berger wrote:
> On Oct 17, 1:10 pm, Daniel Berger <djber...@gmail.com> wrote:
> > On Oct 17, 9:31 am, Mauricio Fernandez <m...@acm.org> wrote:
> >
> > > rocaml allows you to write Ruby extensions in Objective Caml.
[...]
> > I grabbed the latest and greatest Ocaml tarball and installed it.
> > However, when I try to install rocaml I get this:
> >
> > sh: camlp5: not found
> > *** extconf.rb failed ***
> >
> > I have no camlp5 in /usr/local/bin. I have camlp4, however, and the
> > comments in rocaml_extconf.rb suggest that either should suffice.
[...] 
> I decided to grab camlp5 (http://pauillac.inria.fr/~ddr/camlp5/) and
> try again. The extconf.rb script succeeds now. However, now the make
> fails:
> 
> ocamldep.opt  rubyOCamlUtil.ml > .depend
> sh: ocamldep.opt: not found
> *** Error code 1
> make: Fatal error: Command failed for target `.depend'
> 
> I have ocamldep, but no ocamldep.opt. Where do I go from here?

You didn't    
  make opt.opt
(or make world.opt) when you built ocaml-3.10.0, did you?
(BTW, on Debian the .opt binaries are in ocaml-native-compilers, in case
somebody is reading this)

For the time being, you can just install the native-code compilers or
hand-edit the generated Makefile; scroll down to 

...
#############################################################################
#                                                                           #
#                               Objective Caml                              #
#                                                                           #
#############################################################################

OCAMLC   = ocamlc.opt
OCAMLOPT = ocamlopt.opt
OCAMLDEP = ocamldep.opt
OFLAGS   =  -pp 'camlp5o -I . pa_rocaml.cmo'
OCAML_INCLUDES = 
OCAML_LIBS     = nums.cmxa
...

and remove the .opt extensions. I will add some code to detect whether the
.opt binaries are available.

One last thing; what's your platform? rocaml extensions might or might not
work on AMD64 and OSX because their linkers aren't very smart (they can't
handle non-PIC code, it seems). According to OCaml's 3.10.0 changelog,
  - Intel/AMD 64 bits: generate position-independent code by default.
but I don't know if that's enough or something special must be done at compile
time.

The next Objective Caml release will feature dynamic loading of native code,
so this won't remain a problem for long. 
Meanwhile, static extensions can be used.

-- 
Mauricio Fernandez  -   http://eigenclass.org