Re: [Vala] unused variable warning in generated C code

[Nicolas CARRIER <nicolas carrier parrot com>]

> Date: Fri, 12 Dec 2014 10:54:53 +0100
> From: Luca Bruno <lethalman88 gmail com>
>
> On 12/12/2014 10:46, Nicolas CARRIER wrote:
> > Hello,
> > When I compile the following code :
> >
> > public static int main(string[] args) {
> >      int[] b = { 2, 4, 6, 8 };
> >      foreach (int a in b)
> >          stdout.printf("%d\n", a);
> >      return 0;
> > }
> >
> > with :
> >
> > $ valac -C main.vala
> > $ gcc -Wunused-variable main.c -o main $(pkg-config --cflags --libs
> > glib-2.0)
> >
> >
> > I get the following warning :
> > main.c: In function ?_vala_main?:
> > main.c:38:8: attention : unused variable ?_a_collection_size_?
> > [-Wunused-variable]
> >     gint _a_collection_size_ = 0;
> >          ^
> > What is the reason for this warning ?
> Valac not clever enough to delete unused C variables.
>
> > Is it possible to get rid of it ?
> Yes, ignore C warnings. Or fix vala, in this case it's not easy so I
> don't suggest doing it :)

Thank you for your answer.
The problem is that when I compile vala code with the warning compilations flags 
our build system enables, I have a lot of warnings. This one is only one amongst 
others.
The risk is high to miss a real one in the mass...

Is it planned to "cleanup" this aspect of the generated C code ?

It would be interesting to dig into the code myself, but for now, I am not 
sufficiently skilled in vala, so it would take too much time I think.


Concerning the other warnings I have, do you think it's worth it to submit them 
to the mailing list ? Or will the answers be of the same kind ?

Thank you.