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[Caml-list] Question about warning message.
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Date: | 2004-05-05 (19:22) |
From: | Shawn Wagner <shawnw@s...> |
Subject: | Re: [Caml-list] Question about warning message. |
On Wed, May 05, 2004 at 06:47:15PM +0200, Xavier Leroy wrote: > > my g++ compiler show me this warning: > > << warning: unused variable `int caml__dummy_n' >> > > Here little lines of the function that generates this warning > > .... > > extern "C" > > CAMLprim value > > foo(value n) try { > > CAMLparam1(n); (perhaps something lacks here?!?) > > > > I don't know where is the problem! Please, who can help me? > > There's no problem with your code, and the warning is harmless. > > It's just that the CAMLparam... macros used for GC root registration > expand to complicated C code that happens to trigger the "unused > variable" warning in gcc. > > David Brown suggest: > > > 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. > > Thanks for the suggestion. That might do the job. I'll let the > author of these macros (Damien Doligez) respond when he's back. > A better solution for gcc (And, I think, icc) is to use the unused attribute when the variable's declared. Something like blah caml__dummy_##x __attribute__((__unused__)); -- Shawn Wagner shawnw@speakeasy.org ------------------- To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/ Beginner's list: http://groups.yahoo.com/group/ocaml_beginners