Compatibility 3.11.1 and 3.09.3

Compatibility 3.11.1 and 3.09.3

[michel levy]

I have byte-code produced by ocamlc  version 3.11.1 which does not work
with ocamlrun version 3.09.3.
Is this situation normal ?
Must I have exactly the same version for the compiler producing the
byte-code and the ocamlrun
executing this code ?

    Sincerely yours.

PS : this problem occurs to me because I compile on my machine (ocaml
3.11.1) and I send the byte code
to a web server with an other version (ocaml 3.09.3) and I am not in
charge of this server.

-- 
Michel Levy
LIG, ENSIMAG D105, 681 rue de la passerelle, Domaine Universitaire,
BP72-38402 Saint Martin d'Hères Cedex
Tel:(33)476827246   e.mail : Michel.Levy@imag.fr   
http://membres-liglab.imag.fr/michel.levy 

RE: [Caml-list] Compatibility 3.11.1 and 3.09.3

[David Allsopp]

Michel Levy wrote:
> I have byte-code produced by ocamlc  version 3.11.1 which does not work
> with ocamlrun version 3.09.3.
> Is this situation normal ?

Afraid so.

> Must I have exactly the same version for the compiler producing the
> byte-code and the ocamlrun executing this code ?

Yes - even releases within the same minor version number are not guaranteed
to have binary compatibility. 

>     Sincerely yours.
> 
> PS : this problem occurs to me because I compile on my machine (ocaml
> 3.11.1) and I send the byte code
> to a web server with an other version (ocaml 3.09.3) and I am not in
> charge of this server.

It is (reasonably) easy to compile a local copy of OCaml 3.09.3 and switch
to that for bytecode compilation on your server
(http://caml.inria.fr/pub/distrib/ocaml-3.09/). If you're using camlp4, then
you'll need a slightly screwy Makefile to ensure that you pre-process using
camlp4 from 3.11.1 and compile using ocamlc from 3.09.3 but that's far from
impossible...

Hope that helps inasmuch as it confirms your fears!



David