Инкрементная сборка с GCC и ручным сборочным файлом?

Я пишу код для Bluetooth-чипа NRF51822, в Eclipse с GCC и make-файлом, который я поддерживаю самостоятельно.

Моя проблема в том, что каждый раз, когда я нажимаю build, он компилирует все, что начинает занимать довольно много времени. Я не настолько опытен в создании и поддержке make-файлов, поэтому я понятия не имею, с чего начать, чтобы заставить его собирать incremtal?

Мой make-файл составлен так (я знаю, что есть много, и я не создал это сам — нашел его в учебнике, поэтому я не знаю, что актуально, а что нет :-)):

PROJECT_NAME := my_project

export OUTPUT_FILENAME
#MAKEFILE_NAME := $(CURDIR)/$(word $(words $(MAKEFILE_LIST)),$(MAKEFILE_LIST))
MAKEFILE_NAME := $(MAKEFILE_LIST)
MAKEFILE_DIR := $(dir $(MAKEFILE_NAME) )

TEMPLATE_PATH = nrf51_sdk/toolchain/gcc
ifeq ($(OS),Windows_NT)
include $(TEMPLATE_PATH)/Makefile.windows
else
include $(TEMPLATE_PATH)/Makefile.posix
endif

MK := mkdir
RM := rm -rf

#echo suspend
ifeq ("$(VERBOSE)","1")
NO_ECHO :=
else
NO_ECHO := @
endif

# Toolchain commands
CC              := "$(GNU_INSTALL_ROOT)/bin/$(GNU_PREFIX)-gcc"AS              := "$(GNU_INSTALL_ROOT)/bin/$(GNU_PREFIX)-as"AR              := "$(GNU_INSTALL_ROOT)/bin/$(GNU_PREFIX)-ar" -r
LD              := "$(GNU_INSTALL_ROOT)/bin/$(GNU_PREFIX)-ld"NM              := "$(GNU_INSTALL_ROOT)/bin/$(GNU_PREFIX)-nm"OBJDUMP         := "$(GNU_INSTALL_ROOT)/bin/$(GNU_PREFIX)-objdump"OBJCOPY         := "$(GNU_INSTALL_ROOT)/bin/$(GNU_PREFIX)-objcopy"SIZE            := "$(GNU_INSTALL_ROOT)/bin/$(GNU_PREFIX)-size"
#function for removing duplicates in a list
remduplicates = $(strip $(if $1,$(firstword $1) $(call remduplicates,$(filter-out $(firstword $1),$1))))

#source common to all targets
C_SOURCE_FILES += \
main.c \
file1.c \
file2.c \
file3.c \
file4.c \

#assembly files common to all targets
ASM_SOURCE_FILES  = nrf51_sdk/toolchain/gcc/gcc_startup_nrf51.s

#includes common to all targets
INC_PATHS  = -I Dir1/
INC_PATHS  = -I Dir2
INC_PATHS += -I Dir3
INC_PATHS += -I Dir4

OBJECT_DIRECTORY = _build
LISTING_DIRECTORY =$(OBJECT_DIRECTORY)
OUTPUT_BINARY_DIRECTORY =$(OBJECT_DIRECTORY)

# Sorting removes duplicates
BUILD_DIRECTORIES := $(sort $(OBJECT_DIRECTORY) $(OUTPUT_BINARY_DIRECTORY) $(LISTING_DIRECTORY) )

#flags common to all targets
CFLAGS  = -DSOFTDEVICE_PRESENT
CFLAGS += -DNRF51
CFLAGS += -DS110
CFLAGS += -DBOARD_PCA10028
CFLAGS += -DBLE_STACK_SUPPORT_REQD
CFLAGS += -mcpu=cortex-m0
CFLAGS += -mthumb -mabi=aapcs --std=gnu99
CFLAGS += -Wall -O0 -g3
CFLAGS += -mfloat-abi=soft
# keep every function in separate section. This will allow linker to dump unused functions
CFLAGS += -ffunction-sections -fdata-sections -fno-strict-aliasing
#CFLAGS += -flto -fno-builtin

# keep every function in separate section. This will allow linker to dump unused functions
LDFLAGS += -Xlinker -Map=$(LISTING_DIRECTORY)/$(OUTPUT_FILENAME).map
LDFLAGS += -mthumb -mabi=aapcs -L $(TEMPLATE_PATH) -T$(LINKER_SCRIPT)
LDFLAGS += -mcpu=cortex-m0
# let linker to dump unused sections
LDFLAGS += -Wl,--gc-sections
# use newlib in nano version
LDFLAGS += --specs=nano.specs -lc -lnosys

# Assembler flags
ASMFLAGS += -x assembler-with-cpp
ASMFLAGS += -DSOFTDEVICE_PRESENT
ASMFLAGS += -DNRF51
ASMFLAGS += -DS110
ASMFLAGS += -DBOARD_PCA10028
ASMFLAGS += -DBLE_STACK_SUPPORT_REQD
#default target - first one defined
default: clean nrf51422_xxac_s110

#building all targets
all: clean
$(NO_ECHO)$(MAKE) -f $(MAKEFILE_NAME) -C $(MAKEFILE_DIR) -e cleanobj
$(NO_ECHO)$(MAKE) -f $(MAKEFILE_NAME) -C $(MAKEFILE_DIR) -e nrf51422_xxac_s110

#target for printing all targets
help:
@echo following targets are available:
@echo   nrf51422_xxac_s110
@echo   flash_softdeviceC_SOURCE_FILE_NAMES = $(notdir $(C_SOURCE_FILES))
C_PATHS = $(call remduplicates, $(dir $(C_SOURCE_FILES) ) )
C_OBJECTS = $(addprefix $(OBJECT_DIRECTORY)/, $(C_SOURCE_FILE_NAMES:.c=.o) )

ASM_SOURCE_FILE_NAMES = $(notdir $(ASM_SOURCE_FILES))
ASM_PATHS = $(call remduplicates, $(dir $(ASM_SOURCE_FILES) ))
ASM_OBJECTS = $(addprefix $(OBJECT_DIRECTORY)/, $(ASM_SOURCE_FILE_NAMES:.s=.o) )

vpath %.c $(C_PATHS)
vpath %.s $(ASM_PATHS)

OBJECTS = $(C_OBJECTS) $(ASM_OBJECTS)

nrf51422_xxac_s110: OUTPUT_FILENAME := nrf51422_xxac_s110
nrf51422_xxac_s110: LINKER_SCRIPT=ble_app_hrs_gcc_nrf51.ld
nrf51422_xxac_s110: $(BUILD_DIRECTORIES) $(OBJECTS)
@echo Linking target: $(OUTPUT_FILENAME).out
$(NO_ECHO)$(CC) $(LDFLAGS) $(OBJECTS) $(LIBS) -o $(OUTPUT_BINARY_DIRECTORY)/$(OUTPUT_FILENAME).out
$(NO_ECHO)$(MAKE) -f $(MAKEFILE_NAME) -C $(MAKEFILE_DIR) -e finalize

## Create build directories
$(BUILD_DIRECTORIES):
echo $(MAKEFILE_NAME)
$(MK) $@

# Create objects from C SRC files
$(OBJECT_DIRECTORY)/%.o: %.c
@echo Compiling file: $(notdir $<)
@echo arm-none-eabi-gcc $(CFLAGS) $(INC_PATHS) -c -o $@ $<
$(NO_ECHO)$(CC) $(CFLAGS) $(INC_PATHS) -c -o $@ $<

# Assemble files
$(OBJECT_DIRECTORY)/%.o: %.s
@echo Compiling file: $(notdir $<)
$(NO_ECHO)$(CC) $(ASMFLAGS) $(INC_PATHS) -c -o $@ $<# Link
$(OUTPUT_BINARY_DIRECTORY)/$(OUTPUT_FILENAME).out: $(BUILD_DIRECTORIES) $(OBJECTS)
@echo Linking target: $(OUTPUT_FILENAME).out
$(NO_ECHO)$(CC) $(LDFLAGS) $(OBJECTS) $(LIBS) -o $(OUTPUT_BINARY_DIRECTORY)/$(OUTPUT_FILENAME).out## Create binary .bin file from the .out file
$(OUTPUT_BINARY_DIRECTORY)/$(OUTPUT_FILENAME).bin: $(OUTPUT_BINARY_DIRECTORY)/$(OUTPUT_FILENAME).out
@echo Preparing: $(OUTPUT_FILENAME).bin
$(NO_ECHO)$(OBJCOPY) -O binary $(OUTPUT_BINARY_DIRECTORY)/$(OUTPUT_FILENAME).out $(OUTPUT_BINARY_DIRECTORY)/$(OUTPUT_FILENAME).bin

## Create binary .hex file from the .out file
$(OUTPUT_BINARY_DIRECTORY)/$(OUTPUT_FILENAME).hex: $(OUTPUT_BINARY_DIRECTORY)/$(OUTPUT_FILENAME).out
@echo Preparing: $(OUTPUT_FILENAME).hex
$(NO_ECHO)$(OBJCOPY) -O ihex $(OUTPUT_BINARY_DIRECTORY)/$(OUTPUT_FILENAME).out $(OUTPUT_BINARY_DIRECTORY)/$(OUTPUT_FILENAME).hex

finalize: genbin genhex echosize

genbin:
@echo Preparing: $(OUTPUT_FILENAME).bin
$(NO_ECHO)$(OBJCOPY) -O binary $(OUTPUT_BINARY_DIRECTORY)/$(OUTPUT_FILENAME).out $(OUTPUT_BINARY_DIRECTORY)/$(OUTPUT_FILENAME).bin

## Create binary .hex file from the .out file
genhex:
@echo Preparing: $(OUTPUT_FILENAME).hex
$(NO_ECHO)$(OBJCOPY) -O ihex $(OUTPUT_BINARY_DIRECTORY)/$(OUTPUT_FILENAME).out $(OUTPUT_BINARY_DIRECTORY)/$(OUTPUT_FILENAME).hex

echosize:
-@echo ""$(NO_ECHO)$(SIZE) $(OUTPUT_BINARY_DIRECTORY)/$(OUTPUT_FILENAME).out
-@echo ""
clean:
$(RM) $(BUILD_DIRECTORIES)

cleanobj:
$(RM) $(BUILD_DIRECTORIES)/*.o

flash: $(MAKECMDGOALS)
@echo Flashing: $(OUTPUT_BINARY_DIRECTORY)/$<.hex
nrfjprog --reset --program $(OUTPUT_BINARY_DIRECTORY)/$<.hex)

## Flash softdevice
flash_softdevice:
@echo Flashing: s110_softdevice.hex
nrfjprog --reset --program nrf51_sdk/softdevice/s110/hex/s110_softdevice.hex