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What are the etiquette involved when cross-posting programming questions on StackOverflow and GameDev.StackExchange? Or is it a case of "don't do it?"
I think that this would be a good case for don't do it.
I'm going for one or the other.
And not just SO - I've seen many questions on here and on Gamedev.net, with post times ~5 minutes of each other.
Another vote for SO xor GDSE. As another argument against both, we've had at least one case of a question getting migrated from SO to here after being asked both places, leaving us with a duplicate.
As others have said and I'm sure you've realized by now, I would not do it either as it wastes people's time.
But I do wish the two sites were merged/combined - because points are divided, and the very issue this question raises.