west doesn't work with python 3.10

[0xlee]

I have arch linux and have problems with python 3.10. And in arch linux, it's almost impossible to use python 3.9.

% west build -b nrf52840dongle_nrf52840
-- west build: generating a build system
Including boilerplate (Zephyr base (cached)): /home/dongha/projects/third/zephyrproject-nrf-v1.9.1/zephyr/cmake/app/boilerplate.cmake
-- Application: /home/dongha/projects/third/connectedhomeip/examples/lighting-app/nrfconnect
-- Zephyr version: 2.7.99 (/home/dongha/projects/third/zephyrproject-nrf-v1.9.1/zephyr), build: v2.7.99-ncs1-17-gc3208e7ff49d
CMake Error at /usr/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:230 (message):
  Could NOT find Python3: Found unsuitable version "3.10.4", but required is
  exact version "3.9" (found /usr/bin/python3.10, found components:
  Interpreter)
Call Stack (most recent call first):
  /usr/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:592 (_FPHSA_FAILURE_MESSAGE)
  /usr/share/cmake/Modules/FindPython/Support.cmake:3181 (find_package_handle_standard_args)
  /usr/share/cmake/Modules/FindPython3.cmake:490 (include)
  /home/dongha/projects/third/zephyrproject-nrf-v1.9.1/zephyr/cmake/python.cmake:44 (find_package)
  /home/dongha/projects/third/zephyrproject-nrf-v1.9.1/zephyr/cmake/app/boilerplate.cmake:149 (include)
  /home/dongha/projects/third/zephyrproject-nrf-v1.9.1/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:24 (include)
  /home/dongha/projects/third/zephyrproject-nrf-v1.9.1/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:40 (include_boilerplate)
  CMakeLists.txt:34 (find_package)

[marc-hb]

As you can see this is not a west error, it's coming from CMake. Try this:

west -v build -b nrf52840dongle_nrf52840

This will print the cmake command at the very start. Delete the build directory and run that cmake command directory without involving west at all. Observe the same error and close this issue, thanks!

[0xlee]

Oh. Sorry for not paying attention enough. Thanks!