Re: [Caml-list] Manually linking generated native code

["Christoph Höger" <christoph.hoeger@celeraone.com>]

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Could you elaborate a little bit, how that should work? AFAIK, e.g. the
curry helpers are generated in Cmmgen, which is absolutely sensible, since
they certainly do not depend on the machine architecture, right? So when
and where does the linker use this generation?

To motivate my question a little bit, I was wondering whether I could load
two different OCaml executables inside the same process by using LLVM's
runtime linker. In principle, when I load them, they should be able to
cooperate across the shared heap, but otherwise live in total isolation (in
particular their garbage collectors should not interfere).

On Thu, Jan 19, 2017 at 1:11 PM, Gerd Stolpmann <info@gerd-stolpmann.de>
wrote:

> Am Donnerstag, den 19.01.2017, 10:44 +0100 schrieb Christoph Höger:
>
> Dear all,
>
> consider a simple test program:
>
>   let _ = Printf.printf "Hello world!\n"
>
> I can generate the relevant assembly just fine, e.g.:
>
> ocamlopt -dstartup -S test.ml
> gcc -c a.out.startup.s -c
>
> But I cannot link it:
>
> gcc a.out.startup.o -L$(ocamlc -where) -lasmrun_shared
> ....
> a.out.startup.o(.data+0x6e8): error: undefined reference to
> 'camlStd_exit__frametable'
> collect2: Fehler: ld gab 1 als Ende-Status zurück
> distcc[9960] ERROR: compile (null) on localhost failed
>
> It seems that the whole Pervasives is missing (which is kind of expected).
>
> How do I link it, manually? Where are the relevant object files?
>
>
> There's stdlib.a in the OCaml library directory.
>
> This is not the only problem with your approach. The OCaml linker
> generates a number of functions that are global to the whole OCaml program
> (in particular currying helpers). These are first known at link time and
> thus generated that late. AFAIK you cannot generate these functions outside
> the linker step.
>
> The only official way how to turn OCaml code into a linkable object is
> described here: http://caml.inria.fr/pub/docs/manual-ocaml/intfc.
> html#s%3Aembedded-code
>
> Gerd
>
>
> thanks,
>
> Christoph
>
> --
> ------------------------------------------------------------
> 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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