[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

The RIOT community cares a lot about code quality.
Therefore, before describing what your contribution is about, we would like
you to make sure that your modifications are compliant with the RIOT
coding conventions, see https://github.com/RIOT-OS/RIOT/wiki/Coding-conventions.

### 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.

Put here the description of your contribution:
- describe which part(s) of RIOT is (are) involved
- if it's a bug fix, describe the bug that it solves and how it is solved
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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.

Details steps to test your contribution:
- which test/example to compile for which board and is there a 'test' command
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### Issues/PRs references

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

Examples: Fixes #1234. See also #5678. Depends on PR #9876.

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-- Commit Summary --

  * make: add LOG_LEVEL to overridable variables

-- File Changes --

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

-- Patch Links --


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