I cocked-up backing out an unwanted change to CFLAGS which created badness in the Makefile_inc.mk file.

firmware/common/Makefile_inc.mk

@@ -45,8 +45,8 @@ OBJDUMP = $(PREFIX)-objdump
 GDB = $(PREFIX)-gdb
 TOOLCHAIN_DIR := $(shell dirname `which $(CC)`)/../$(PREFIX)
 
-		-fno-common -mcpu=cortex-m4 -mthumb -MD \
 CFLAGS += -std=c99 -O2 -g3 -Wall -Wextra -I$(LIBOPENCM3)/include -I../common \
+		-fno-common -mcpu=cortex-m4 -mthumb -MD \
 		-mfloat-abi=hard -mfpu=fpv4-sp-d16 \
 		$(HACKRF_OPTS)
 #LDSCRIPT ?= $(BINARY).ld