[riot-notifications] [RIOT-OS/RIOT] make: add LOG_LEVEL to overridable variables (#11592)

Alexandre Abadie notifications at github.com
Tue May 28 10:52:17 CEST 2019


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### Contribution description

This PR allows to set the logging level via a make variable instead of having to explicitly set this via CFLAGS. Example:
With this PR, one can use `LOG_LEVEL=4 make -C <application dir>` to enable debug log level instead of CFLAGS=-DLOG_LEVEL=4 make -C <application dir>

If an application already set the log level via CFLAGS, then this variable is ignored.

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### Testing procedure

One can try to disable logging by using LOG_LEVEL=0 in any application an notice that the `This is RIOT!` welcome message is not displayed at any application startup.

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### Issues/PRs references

Idea raised by @miri64 in #11573 (see https://github.com/RIOT-OS/RIOT/pull/11573#discussion_r287611278)

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You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/11592

-- Commit Summary --

  * make: add LOG_LEVEL to overridable variables

-- File Changes --

    M Makefile.include (6)
    M makefiles/vars.inc.mk (2)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/11592.patch
https://github.com/RIOT-OS/RIOT/pull/11592.diff

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