Suppressing "Parameter not used" Warning

In article <3r81b3Fi346kU1@individual.net>,
S.Tobias <siXtY@FamOuS.BedBuG.pAlS.INVALID> wrote:
> 
> This idea has been wandering around me for some time, too.
> It could work like this: programmer puts #pramas in the code,
> which contain verbatim quotes (or regexes, or identifires) of warnings
> that are to be suppressed for the next line.  The utility program (or
> a script) calculates line numbers and produces a list of warnings
> (with the line numbers) to cut out from the compiler output.
> Like this:
>   #pragma nowarn t.c:%n: warning: comparison between signed and unsigned
>   if (u>s)

Lately, I've been fixing this with:

  if (s < 0 || u > (unsigned) s)

but only after careful examination of what s really
represents.  If s just contained a sloppy assignment from
what was previously an unsigned value, then no need for the
extra mathematical rigor.

Also, a lot these warnings arise from people using int when
they should have used size_t.