From: Daniel de Rauglaudre <daniel.de_rauglaudre@inria.fr>
To: Gao katie <katiegao@yahoo.com>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] newbie question: How to do conditional compilation?
Date: Tue, 18 Sep 2001 10:06:27 +0200 [thread overview]
Message-ID: <20010918100627.C22805@verdot.inria.fr> (raw)
In-Reply-To: <20010918040228.8243.qmail@web10102.mail.yahoo.com>; from katiegao@yahoo.com on Mon, Sep 17, 2001 at 09:02:28PM -0700
Hi,
On Mon, Sep 17, 2001 at 09:02:28PM -0700, Gao katie wrote:
> Can anyone tell me how to do conditional compilation in Ocaml?
> #ifdef DEBUG
> ...
> #else
> ...
> #endif
1/
You can use camlp4.
Compile either with
ocamlc -pp "camlp4o pa_ifdef.cmo"
or with
ocamlc -pp "camlp4o pa_ifdef.cmo -DDEBUG"
In your code, you can then use "ifdef DEBUG ... else ... end" in
position of expression, or "ifdef ... end" in position of structure
item (toplevel phrase, if you prefer). You can also use "define"
(but without parameters: "define DEBUG", not "define DEBUG xxx")
2/
Another solution is to use /lib/cpp, the C preprocessor. I think that
you can use it in only one command with the ocamlc parameter -pp:
ocamlc -pp "/lib/cpp"
ocamlc -pp "/lib/cpp -DDEBUG"
--
Daniel de RAUGLAUDRE
daniel.de_rauglaudre@inria.fr
http://cristal.inria.fr/~ddr/
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prev parent reply other threads:[~2001-09-18 8:06 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-09-18 4:02 Gao katie
2001-09-18 8:06 ` Daniel de Rauglaudre [this message]
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