[riot-notifications] [RIOT-OS/RIOT] makefiles/kconfig.mk: force SHOULD_USE_KCONFIG if config file is present (#16641)

José Alamos notifications at github.com
Wed Jul 14 01:17:48 CEST 2021


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### Contribution description
This PR forces SHOULD_RUN_KCONFIG whenever a previous configuration file is present.
As it is on master, running `make menuconfig` on applications that set `SHOULD_RUN_KCONFIG` to blank (e.g `gnrc_lorawan`) will silently fail because the keys are not set.

It's fine to skip calling Kconfig if an `app.config` file is set and `SHOULD_RUN_KCONFIG` not, but if the user explicitly called `make menuconfig` Kconfig should not be skipped.

This commit also adds a warning when the config file is present and `SHOULD_RUN_KCONFIG` is not.

Thanks @leandrolanzieri for the proposed fix!


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### Testing procedure
```
make clean
SHOULD_RUN_KCONFIG= make
# Should not show any warning
make menuconfig
# Save menuconfig
SHOULD_RUN_KCONFIG= make
# Now it should show a warning and set SHOULD_RUN_KCONFIG to 1.
```
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### Issues/PRs references

None so far
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You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/16641

-- Commit Summary --

  * makefiles/kconfig.mk: force SHOULD_USE_KCONFIG if config file is present

-- File Changes --

    M makefiles/kconfig.mk (20)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/16641.patch
https://github.com/RIOT-OS/RIOT/pull/16641.diff

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