Oops. Forgot about OCAMLRUNPARAM. Both your and my example work now. Okay,
this resolves the issue in some sense; you have to be careful about
exceptions being raised that you don't see. Thanks for the explanations.


On Mon, Jan 17, 2011 at 12:02 PM, Xavier Clerc <xavier.clerc@inria.fr>wrote:

>
>
> ------------------------------
>
> *De: *"Ashish Agarwal" <agarwal1975@gmail.com>
> *À: *"xclerc" <xavier.clerc@inria.fr>
> *Cc: *"Caml List" <caml-list@inria.fr>
> *Envoyé: *Lundi 17 Janvier 2011 17:41:13
> *Objet: *Re: [Caml-list] printing an exception changes printed backtrace
>
>
> On Mon, Jan 17, 2011 at 10:37 AM, xclerc <xavier.clerc@inria.fr> wrote:
>
>
>> The underlying problem is that "Printexc.print_backtrace" prints the
>> backtrace
>> for the last exception raised... which can be one raised by
>> "Printf.eprintf" or
>> "Printexc.to_string", but locally caught and not exposed to the outside
>> world.
>>
>
> Okay, that makes sense.
>
>
>
>> You will get different backtraces according to the value of
>> "custom_printer".
>>
>
> I'm actually getting the same output (just "Not_found" printed). Tried
> native and byte code, on two different systems.
>
> Based on your explanation, I was expecting the following to give different
> output if you change true to false. But actually nothing is printed out in
> any case. So I'm really unclear now as to what print_backtrace does.
>
> Are you sure that you compiled the source with the "-g" option,
> *and* set the OCAMLRUNPARAM environment variable to "b"?
>
>
> Regards,
>
> Xavier Clerc
>
>