%script
export LANG=C
gifsicle blank.gif -o /dev/null 2>&1 && echo blank worked
gifsicle -w blank.gif -o /dev/null 2>&1 && echo blank worked
gifsicle blank-garbage.gif -o /dev/null 2>&1 && echo blank-garbage worked
gifsicle -w blank-garbage.gif -o /dev/null 2>&1 && echo blank-garbage worked

%file -e blank.gif
R0lGODlhAQABAIAAAAAAAAAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==

%file -e blank-garbage.gif
R0lGODlhAQABAIAAAAAAAAAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAO2Rhc2prZm5zZGtqYW5m
a2pkbnNha2YK

%expect stdout
blank worked
blank worked
gifsicle:blank-garbage.gif: warning: trailing garbage after GIF ignored
blank-garbage worked
blank-garbage worked