[riot-notifications] [RIOT-OS/RIOT] makefiles/cflags.inc.mk: handle optional cflags (#12123)

Sebastian Meiling notifications at github.com
Mon Sep 2 10:18:40 CEST 2019


this broke support for GCC 5.4 which doesn't know about `-Wformat-overflow` and `-Wformat-truncation`. We discovered that bc part of our HIL setup was running Raspbian stretch (Debian 9) where the `arm-none-eabi-gcc` is still version 5.x.

We currently update to Raspbian Buster which has GCC 7 (same version as riotdocker image) that  should fix the issue.

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