No, seriously, I use bug jars baited with sugar water or rotten meat. This time of year I use sugar water, but as the season progresses I change over to bits of meat.
I use food grade Diatomaceous Earth, also known here as DE. I sprinkle it in with their food; works good as a wormer and flies may land on the poop, but they soon die too.
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How long does it take for this to work? I sprinkled some in the coop yesterday. These flies are driving me mad. I've hauled off 4 sticky traps full in the last few days and there are still jillions of them! I've never had this much trouble with flies before.