From: Stefano Zacchiroli <zack@upsilon.cc>
To: caml-list@yquem.inria.fr, OCaml <caml-list@inria.fr>
Subject: Re: [Caml-list] Using camlp4 in extensions
Date: Mon, 15 Dec 2008 23:13:48 +0100 [thread overview]
Message-ID: <20081215221348.GA16496@usha.takhisis.invalid> (raw)
In-Reply-To: <494663F2.7090409@mcmaster.ca>
On Mon, Dec 15, 2008 at 09:04:34AM -0500, Jacques Carette wrote:
> AFAIK, extensions are not ordered, so trying to use camlp4 to deal
> with IFDEF in the source of a syntax extension (like pa_monad) to
> switch between 3.10 and 3.11 [to deal with the new private and lazy
> features] does not seem possible.
Why so?
When you build a camlp4 extension you're compiling some code relying
on camlp4 _as a library_. The code you're actually compiling is
compiled by the ocaml compiler, which can possibly receive it from
whatever pre-processor. That pre-processor can of course be camlp4
itself, loading some other camlp4 extension.
In short:
ocamlc -pp "camlp4o available_ext.cmo" -c new_ext.ml
should work.
Of course, as observed, you can have grammar conflicts between the two
extensions, but that's an entirely different problem.
Cheers.
--
Stefano Zacchiroli -o- PhD in Computer Science \ PostDoc @ Univ. Paris 7
zack@{upsilon.cc,pps.jussieu.fr,debian.org} -<>- http://upsilon.cc/zack/
Dietro un grande uomo c'è ..| . |. Et ne m'en veux pas si je te tutoie
sempre uno zaino ...........| ..: |.... Je dis tu à tous ceux que j'aime
prev parent reply other threads:[~2008-12-15 22:14 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-15 14:04 Jacques Carette
2008-12-15 15:24 ` [Caml-list] " Richard Jones
2008-12-15 16:10 ` Mauricio Fernandez
2008-12-15 16:15 ` Jacques Carette
2008-12-15 16:38 ` blue storm
2008-12-15 22:13 ` Stefano Zacchiroli [this message]
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