Not all diets produce such odoriferous feces. When I'm eating mostly plain raw produce like a vegetarian, a typical western flush toilet is pretty successful in minimizing poop odor. Meat in my diet makes odor suppression a whole lot more challenging.

For the last few months I've been using a urine-diverting style waterless toilet, where the solids land in a bucket with dirt. This means the solids are uncovered until completion, when more dirt gets poured over. The dietary feedback in this arrangement can be brutal, odor being a significant component until covered.