[riot-notifications] [RIOT-OS/RIOT] make: introduce $(CLEAN) (#11829)

Kaspar Schleiser notifications at github.com
Fri Jul 12 11:25:56 CEST 2019


### Contribution description

Currently, some targets are serialized before "clean" by conditionally
adding a dependency.

Make does allow ordering using "|" syntax in prerequisites, but for
"clean" that would always trigger the clean target.
By only conditionally setting $(CLEAN) to clean, that can be
circumvented.

The new CLEAN allows any recipe to be run after "clean" by specifying "|
$(CLEAN)" as prerequisite.

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### Testing procedure

Try ```make clean all -j``` and ```make all -j```, ensuring both still work as expected (both with existing and non-existing ```bin/```.

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### Issues/PRs references

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

  https://github.com/RIOT-OS/RIOT/pull/11829

-- Commit Summary --

  * make: introduce $(CLEAN)

-- File Changes --

    M Makefile.include (11)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/11829.patch
https://github.com/RIOT-OS/RIOT/pull/11829.diff

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