I don't think you read the whole thread.
Earlier on, I explained exactly what I wanted: just add some "select"
statements to pickt he things you need per the particular target
configuration. You seem to have missed that part.
In other words, you _can_ encode the information that is in the
xyz_defconfig files by doing it in Kconfig.xyz files instead. But you do
it in a human-readable manner. And the hierarchical thing is absolutely
required for that - otherwise you'd end up with just another form of the
In other words, you should be able to basically use "make allnoconfig"
together with a Kconfig.xyz file input to select _exactly_ the pieces you
need, and nothing else.