Since Commit https://github.com/NordicPlayground/fw-nrfconnect-zephyr/commit/bd7569f272882f105515acda04e45e7878a68e13
the cmake build on Windows is broken (see also https://devzone.nordicsemi.com/f/nordic-q-a/45543/issue-with-command-line-compilation-of-nrf9160-samples ).
This is because the python script zephyr/scripts/zephyr_module.py outputs Windows backslash paths into file build/Kconfig.modules which cannot be process
afterwards by the Kconfig step zephyr/scripts/kconfig/kconfig.py!
With attached patch this can be fixed temporarly.
regards,
Gregor Bader