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-rw-r--r--mk/avr.rules.mk2
1 files changed, 1 insertions, 1 deletions
diff --git a/mk/avr.rules.mk b/mk/avr.rules.mk
index 66fab58..97d9fdf 100644
--- a/mk/avr.rules.mk
+++ b/mk/avr.rules.mk
@@ -33,7 +33,7 @@ OBJ = $(SRC:.c=.o) $(ASRC:.S=.o)
TGT_CFLAGS += -mmcu=$(MCU) $(OPT) $(CSTD) -g
TGT_CFLAGS += $(ARCH_FLAGS)
-TGT_CFLAGS += -Wextra -Wshadow -Wimplicit-function-declaration
+TGT_CFLAGS += -Wextra -Wshadow -Wimplicit-function-declaration -Wimplicit-fallthrough=1
TGT_CFLAGS += -Wredundant-decls -Wstrict-prototypes
TGT_CFLAGS += -fshort-enums -funsigned-bitfields
TGT_CFLAGS += -fno-common -ffunction-sections -fdata-sections