[riot-notifications] [RIOT] Allow change of optimization level for debugging (#3759)

Kaspar Schleiser notifications at github.com
Fri Sep 4 14:34:50 CEST 2015

> Will that cause two separate -O calls?

CFLAGS_OPT is conditionally assigned using ```?=``` like this:
``` CFLAGS_OPT ?= -Os ```

So if it is not set, it will get -Os assigned, otherwise it keeps whatever was assigned before.
You can easily override that, like when building:
```# CFLAGS_OPT=-Og make clean all```

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