CONTIKI_ARM_DIRS += cortex-m/cm4

CFLAGS += -mcpu=cortex-m4

LDFLAGS += -mcpu=cortex-m4 -nostartfiles
LDFLAGS += -T $(LDSCRIPT)
LDFLAGS += -Wl,--gc-sections,--sort-section=alignment
LDFLAGS += -Wl,-Map=$(@:.elf=-$(TARGET).map),--cref,--no-warn-mismatch

TARGET_LIBFLAGS := $(TARGET_LIBFILES) -gcc -lm -lnosys -lc

OBJCOPY_FLAGS += --gap-fill 0xff

### Build syscalls for newlib
MODULES += os/lib/newlib

CPU_STARTFILES := ${addprefix $(OBJECTDIR)/,${call oname, $(CPU_START_SOURCEFILES)}}

### Compilation rules
CUSTOM_RULE_LINK = 1

.SECONDEXPANSION:

%.elf: $(CPU_STARTFILES) $$(CONTIKI_OBJECTFILES) %.o $(PROJECT_OBJECTFILES) $(PROJECT_LIBRARIES) $(TARGET_LIBS)
	$(TRACE_LD)
	$(Q)$(LD) $(LDFLAGS) ${filter %.o %.a,$^} -Wl,--start-group $(TARGET_LIBFLAGS) -Wl,--end-group -o $@

include $(CONTIKI)/arch/cpu/arm/cortex-m/Makefile.cortex-m