From 7e8a0ae2d4f51c6860e10a700b54dca419180b2c Mon Sep 17 00:00:00 2001
From: Marian Buschsieweke <marian.buschsieweke@ovgu.de>
Date: Mon, 30 May 2022 18:22:02 +0200
Subject: [PATCH] build system: use -std=gnu11 for avr8

This allows using the __flash qualifier to store data into flash.
---
 makefiles/arch/avr8.inc.mk | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/makefiles/arch/avr8.inc.mk b/makefiles/arch/avr8.inc.mk
index ef55b40af3..d316264803 100644
--- a/makefiles/arch/avr8.inc.mk
+++ b/makefiles/arch/avr8.inc.mk
@@ -14,6 +14,9 @@ CFLAGS_LINK  = -ffunction-sections -fdata-sections -fno-builtin -fshort-enums
 CFLAGS_DBG  ?= -ggdb -g3
 CFLAGS_OPT  ?= -Os
 
+# Use of __flash requires gnu11 instead of c11
+CFLAGS    += -std=gnu11
+
 CFLAGS    += $(CFLAGS_CPU) $(CFLAGS_LINK) $(CFLAGS_DBG) $(CFLAGS_OPT)
 ASFLAGS   += $(CFLAGS_CPU) $(CFLAGS_DBG)