I thought that could be an issue with multiple machines, thanks for the confirmation.
How am I supposed to decide which kernel config fragments are included in which image though, since they go into SRC_URI? The same problem arises if the same userspace package needs to be built slightly differently for different products
That's not something I can easily control in the image recipe.
Multiple recipes for multiple products is one way to solve this, but I don't find that as an elegant way of solving this problem.
Aleksandar