Commit b3d165f ("scripts: kconfig: Handle warnings generated
during evaluation") made it common for kconfig.py to fail after writing
zephyr/.config. This confuses the configuration fragment checksum logic
in cmake/kconfig.cmake, because it expects the saved checksum file to
exist if zephyr/.config exists.
The end result is a CMake error when rerunning the configuration after
non-whitelisted Kconfig warnings.
Fix it by only writing zephyr/.config (and zephyr/include/autoconf.h) in
kconfig.py if there are no warnings-turned-errors.
Also check if the saved checksum file exists in kconfig.cmake before
trying to open it. Normally this shouldn't happen though.
Move the writing of the checksum file to before writing zephyr/.config
as well. That way, zephyr/.config only gets written if the other
operations succeed.
Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>
5402662dd9