Is it not possible to disable this kind of warning entirely?

It is a stupid idea.

Does declaring the variable as some sort of constant help?

-Michael

> On 14 Feb 2022, at 18:42, Stefan Schantl <stefan.schantl(a)ipfire.org> wrote:
> 
> Signed-off-by: Stefan Schantl <stefan.schantl(a)ipfire.org>
> ---
> config/firewall/rules.pl | 4 ++++
> 1 file changed, 4 insertions(+)
> 
> diff --git a/config/firewall/rules.pl b/config/firewall/rules.pl
> index 162781f7a..c0878059a 100644
> --- a/config/firewall/rules.pl
> +++ b/config/firewall/rules.pl
> @@ -109,6 +109,10 @@ my $POLICY_INPUT_ACTION    = $fwoptions{"FWPOLICY2"};
> my $POLICY_FORWARD_ACTION  = $fwoptions{"FWPOLICY"};
> my $POLICY_OUTPUT_ACTION   = $fwoptions{"FWPOLICY1"};
> 
> +#workaround to suppress a warning when a variable is used only once
> +my @dummy = ( $Location::Functions::ipset_db_directory );
> +undef (@dummy);
> +
> # MAIN
> &main();
> 
> -- 
> 2.30.2
>