[riot-notifications] [RIOT-OS/RIOT] Makefile.include: avoid recursive expansion of USEMODULE (#15835)

Marian Buschsieweke notifications at github.com
Fri Jan 22 09:59:13 CET 2021


> Currently `USEMODULE` is appended using `+=` which makes it recursively expanded.

This is not fully true. The behavior of `+=` depends on what the variable that gets appended to: If the variable existed previously, it will keep its "flavor", e.g. a simply expanded variable will remain simply expended. However, if the variable is undefined, it will be defined as recursively expanded.

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