-------- Original Message -------- Subject: Re: [Caml-list] Question about warning message. Date: Wed, 5 May 2004 18:47:15 +0200 From: Xavier Leroy xavier.leroy@inria.fr To: Claudio Trento trento@di.unipi.it CC: caml-list@inria.fr References: Pine.LNX.4.44.0405051658360.1700-100000@nutella.di.unipi.it
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.
- Xavier Leroy
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