nes-proj/arch/cpu/arm/Makefile.arm

MAKEFILE := $(lastword $(MAKEFILE_LIST))
BASE_DIR := $(realpath $(dir $(MAKEFILE)))

CC       = arm-none-eabi-gcc
CPP      = arm-none-eabi-cpp
LD       = arm-none-eabi-gcc
AR       = arm-none-eabi-ar
OBJCOPY  = arm-none-eabi-objcopy
OBJDUMP  = arm-none-eabi-objdump
NM       = arm-none-eabi-nm
SIZE     = arm-none-eabi-size
SREC_CAT = srec_cat

CFLAGS += -mthumb -mabi=aapcs -mlittle-endian
CFLAGS += -Werror -Wall
CFLAGS += -std=c99
CFLAGS += -ffunction-sections -fdata-sections -fno-strict-aliasing
# A weird behaviour of GCC garbage collection has been observed, where unitialized
# global variables put in the COMMON section weren't analyzed by the garbage collector
# at all. No idea why. The fix is to dissallow the common section, which subsequently
# places all unitialized global variables in the .bss section and enables the
# garbage collector to analyze the variables.
CFLAGS += -fno-common
CFLAGS += -fshort-enums -fomit-frame-pointer -fno-builtin

LDFLAGS += -mthumb -mlittle-endian

OBJDUMP_FLAGS += --disassemble --source --disassembler-options=force-thumb

### Are we building with code size optimisations?
SMALL ?= 1
ifeq ($(SMALL),1)
  CFLAGS += -Os
else
  CFLAGS += -O0
endif

### Use CMSIS and the existing dbg-io from arch/cpu/arm/common
CONTIKI_ARM_DIRS += .
CONTIKI_ARM_DIRS += ../common/dbg-io
CONTIKI_CPU_DIRS += $(realpath $(addprefix $(BASE_DIR)/, $(CONTIKI_ARM_DIRS)))

### CPU-dependent cleanup files
CLEAN += *.elf *.bin *.lst *.hex *.i16hex

### Don't treat the following files as intermediate
.PRECIOUS: %.elf %.hex %.bin

%.i16hex: %.elf
	$(OBJCOPY) -O ihex $< $@

%.hex: %.i16hex
	$(SREC_CAT) $< -intel -o $@ -intel

%.bin: %.elf
	$(OBJCOPY) -O binary $(OBJCOPY_FLAGS) $< $@

%.lst: %.elf
	$(OBJDUMP) $(OBJDUMP_FLAGS) $< > $@

### We don't really need the .hex and .bin for the .$(TARGET) but let's make
### sure they get built
%.$(TARGET): %.elf %.hex %.bin
	cp $< $@