Re: [Caml-list] weird behavior with camlp4o

[forum@x9c.fr]

Selon "Andrew I. Schein" <andrew@andrewschein.com>:

> Greetings list -
>
> I was playing around with OCaml 3.10.2 camlp4o like this:
>
> camlp4o pa_breakcont.cmo sample1.ml
>
> with my macro pa_breakcont.cmo and got the expected macro translation
> printed to my terminal.  However, when I type:
>
> camlp4o pa_breakcont.cmo sample1.ml > out.ml
>
> out.ml contains binary output.  Am I misusing camlp4o?

I have encountered the same problem a few days ago while working on
Ocaml-Java to make it camlp4-compatible.

The fact is that the kind of output (binary dump of abstract tree or
source code in textual form) is chosen according to the nature of the
output file descriptor. If the output file descriptor denotes a tty
then the textual form is chosen, otherwise the binary form is chosen.

That being said, I don't know what is the rationale of this choice,
as I have not come up with a use case for the binary form.


Hope this helps,

Xavier Clerc