Re: [Help-gsl] unused variable warning

[Jordi Gutierrez Hermoso]

On 28 Mar 2007 21:18:54 -0000, Awhan  Patnaik
<address@hidden> wrote:
> I am using g++ compiler to integrate a system of ordinary differential
>  equations. I have turned on the warning flags
> -W and -Wall&nbsp; -Werror
> How can I get rid of the warning?
> Is there some elegant way apart from a dirty hack of using ``t\" is some
> operation which has no real meaning and > exists only to get rid of the warning 
> ?

That's what I normally do. Just put

    t;

somewhere in your code. It will get rid of the warning and generates
no object code as far as I can tell if you're using -O3 optimisation
flag, which you should be using for numerical coding anyways.

Alternatively, instead of using -Wall, you can use
-W$(each-individual-warning) as a parameter to g++. (man gcc to see
what warnings -Wall turns on, and just mention each warning
individually instead of all at once; put them in your Makefile).

By the way, are you actually coding in C++? If so, this is
interesting, because it pleases me a lot to see that there is real
demand for a C++ version of the GSL. I put an application for doing
this for Google Summer of Code. I should know by April 11 if GNU and
Google think that this is a good project. A C++ class instead of rigid
function signatures with void* should be better equipped handle better
unused arguments. :-)

- Jordi G. H.