From: Roberto Bagnara <bagnara@cs.unipr.it>
To: David Brown <caml-list@davidb.org>
Cc: Claudio Trento <trento@di.unipi.it>,
caml-list@inria.fr, ppl-devel@cs.unipr.it
Subject: Re: [Caml-list] Question about warning message.
Date: Wed, 05 May 2004 18:40:48 +0200 [thread overview]
Message-ID: <40991910.6040404@cs.unipr.it> (raw)
In-Reply-To: <20040505160230.GA26320@davidb.org>
David Brown wrote:
> On Wed, May 05, 2004 at 05:16:06PM +0200, Claudio Trento wrote:
>>my g++ compiler show me this warning:
>>
>> << warning: unused variable `int caml__dummy_n' >>
>
>
> It is part of the construct the headers use to implement the
> CAMLparam... macros. Strictly it isn't necessary in C++, since you can
> have declarations in the middle of a block, but then there would be
> different constructs for C and C++.
That would not be a problem: most header files that must work
with both C and C++ do that. For example, one thing that
the OCaml include files out to start and end with is
#ifdef __cplusplus
extern "C" {
#endif
...
#ifdef __cplusplus
} /* extern "C" */
#endif
Similar things based on the __cplusplus macro allows to obtain
header files that are 100% standard compliant with respect to
both C and C++.
> BTW, what about having a
> (void) caml__dummy_##x;
>
> at the end of the CAMLxparam... macros? This does shut up the warning,
> at least on gcc.
This would do the trick, even though it is a bit of a hack.
What do the OCaml developers think?
Are they willing to accept patches to solve these problems?
Cheers,
Roberto
--
Prof. Roberto Bagnara
Computer Science Group
Department of Mathematics, University of Parma, Italy
http://www.cs.unipr.it/~bagnara/
mailto:bagnara@cs.unipr.it
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next prev parent reply other threads:[~2004-05-05 16:41 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-05 15:16 Claudio Trento
2004-05-05 16:02 ` David Brown
2004-05-05 16:40 ` Roberto Bagnara [this message]
2004-05-17 14:43 ` Damien Doligez
2004-05-17 15:31 ` Olivier Andrieu
2004-05-17 16:44 ` Roberto Bagnara
2004-05-05 16:47 ` Xavier Leroy
2004-05-05 19:22 ` Shawn Wagner
2004-05-05 20:46 ` Evan Martin
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