From 3c0498d835225ed0dae563a5e684cc105c42272d Mon Sep 17 00:00:00 2001
From: Joakim Gebart <joakim.gebart@eistec.se>
Date: Sat, 30 May 2015 11:13:12 +0200
Subject: [PATCH] cortexm: escalate implicit-function-declaration to error

"implicit declaration of function 'blah'" is a symptom of a missing #include
and should be considered an error.
---
 boards/Makefile.include.cortexm_common | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/boards/Makefile.include.cortexm_common b/boards/Makefile.include.cortexm_common
index 9273b7e198..05c5ca7868 100644
--- a/boards/Makefile.include.cortexm_common
+++ b/boards/Makefile.include.cortexm_common
@@ -9,7 +9,7 @@ include $(RIOTBOARD)/Makefile.include.gnu
 
 # define build specific options
 export CFLAGS_CPU   = -mcpu=$(MCPU) -mlittle-endian -mthumb -mno-thumb-interwork $(CFLAGS_FPU)
-export CFLAGS_STYLE = -std=gnu99 -Wall -Wstrict-prototypes
+export CFLAGS_STYLE = -std=gnu99 -Wall -Wstrict-prototypes -Werror=implicit-function-declaration
 export CFLAGS_LINK  = -ffunction-sections -fdata-sections -fno-builtin
 export CFLAGS_DBG   = -ggdb -g3
 export CFLAGS_OPT   ?= -Os
-- 
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