> So you concur with me that if Google changed the Android kernel it would be a big change?
No I don't, anyone writing portable applications already does compilations all the time.
It is no different than the requirements to provide newer builds updated to specific Android target versions, or being 64 bit only that Google keeps forcing devs to move forward.
It is Google and OEM's job to ensure that NDK APIs work across whatever kernels are available.
Any application that depends on syscalls isn't portable across Android devices anyway. Google doesn't support syscalls as part of the NDK stable APIs contract, and some OEMs are well known to change their behavior.