求高手详解一下这个makefile
## 需要修改的地方 ##
#单片机类型
MCU = atmega16
#工作频率
CPU_FREQ = 14745600UL
#生成文件名
TARGET = demo
#要包含的路径(本用例包含add sub mul 三个目录)
VPATH = ./add:./sub:./mul
#优化等级
OPTIMIZATION = 0
#编译器路径(不一定要指定，如果用20060119版本的，需要指定)
#GCC_PATH = c:/winavr
############# 以下均不需要修改 ###################
## 编译器参数设置 ##
TCHAIN = avr
CC = $(TCHAIN)-gcc
C++ = $(TCHAIN)-g++
OBJCOPY = $(TCHAIN)-objcopy
OBJDUMP = $(TCHAIN)-objdump
SIZE = $(TCHAIN)-size
MKDIR = mkdir
RMDIR = rmdir
RM = rm -f
#定义输出目录名
OUTPUT_PATH=output
EXE_PATH = $(OUTPUT_PATH)/exe
LST_PATH = $(OUTPUT_PATH)/lst
OBJ_PATH = $(OUTPUT_PATH)/obj
EXT_EXE_PATH = ./$(EXE_PATH)/
EXT_LST_PATH = ./$(LST_PATH)/
EXT_OBJ_PATH = ./$(OBJ_PATH)/
#定义文件类型
C_SUFFIX = *.c
CPP_SUFFIX = *.cpp
ASM_SUFFIX = *.s
#能否详细说明一下以下一段具体是什么意思？
C_SUF = $(suffix $(C_SUFFIX))
CPP_SUF = $(suffix $(CPP_SUFFIX))
ASM_SUF = $(suffix $(ASM_SUFFIX))
CSRC = $(notdir $(wildcard $(C_SUFFIX) $(addsuffix /$(C_SUFFIX),$(subst :, ,$(VPATH)))))
ASRC = $(notdir $(wildcard $(ASM_SUFFIX) $(addsuffix /$(ASM_SUFFIX),$(subst :, ,$(VPATH)))))
CPPSRC = $(notdir $(wildcard $(CPP_SUFFIX) $(addsuffix /$(CPP_SUFFIX),$(subst :, ,$(VPATH)))))
ELF = $(addprefix $(EXT_EXE_PATH),$(TARGET).elf)
HEX = $(addprefix $(EXT_EXE_PATH),$(TARGET).hex)
EEP = $(addprefix $(EXT_EXE_PATH),$(TARGET)_eeprom.hex)
LST = $(addprefix $(EXT_LST_PATH),$(TARGET).lst)
OBJS = $(addprefix $(EXT_OBJ_PATH),$(CSRC:$(C_SUF)=.o))
OBJS += $(addprefix $(EXT_OBJ_PATH),$(ASRC:$(ASM_SUF)=.o))
OBJS += $(addprefix $(EXT_OBJ_PATH),$(CPPSRC:$(CPP_SUF)=.o))
ASM = $(addprefix $(EXT_LST_PATH),$(CSRC:$(C_SUF)=$(ASM_SUF)))
ASM += $(addprefix $(EXT_LST_PATH),$(CPPSRC:$(CPP_SUF)=$(ASM_SUF)))
#能否详细说明一下以上一段具体是什么意思？
COMMON_FLAGS = -I. -I$(GCC_PATH)/avr/include
COMMON_FLAGS += -mmcu=$(MCU)
COMMON_FLAGS += -O$(OPTIMIZATION)
COMMON_FLAGS += -Wall
COMMON_FLAGS += -funsigned-char
COMMON_FLAGS += -funsigned-bitfields
COMMON_FLAGS += -fpack-struct
COMMON_FLAGS += -fshort-enums
COMMON_FLAGS += -Wstrict-prototypes
COMMON_FLAGS += -DF_CPU=$(CPU_FREQ)
COMMON_FLAGS += -std=gnu99
COMPILE_FLAGS = $(COMMON_FLAGS) -g
ASSEMBLER_FLAGS = $(COMMON_FLAGS) -g -assembler-with-cpp
FLASH_FLAGS = -j .text -j .data
#EEPROM_FLAGS = -j .eeprom --change-section-lma .eeprom=0
EEPROM_FLAGS = -R .eeprom
EEPROM_FLAGS = -j .eeprom
EEPROM_FLAGS += --set-section-flags=.eeprom="alloc,load"
EEPROM_FLAGS += --change-section-lma .eeprom=0 --no-change-warnings
all: CreatePath $(ASM) $(ELF) $(HEX) $(EEP) $(LST) size
no_eeprom: CreatePath $(ASM) $(ELF) $(HEX) $(LST) size
$(ELF): $(OBJS)
$(CC) $(COMPILE_FLAGS) $(OBJS) -o $@
$(HEX): $(ELF)
$(OBJCOPY) $(FLASH_FLAGS) -O ihex $< $@
$(EEP): $(ELF)
-$(OBJCOPY) $(EEPROM_FLAGS) -O ihex $< $@ || exit
$(LST): $(ELF)
$(OBJDUMP) -h -S $^ > $@
size: $(ELF)
@$(SIZE) $<
@$(SIZE) -A $<
@echo
##将cpp文件编译成目标文件(.o)##
$(EXT_OBJ_PATH)%.o : %$(suffix $(CPP_SUFFIX))
$(CC) $(COMPILE_FLAGS) -c $< -o $@
##将c文件编译成目标文件(.o)##
$(EXT_OBJ_PATH)%.o : %$(suffix $(C_SUFFIX))
$(CC) $(COMPILE_FLAGS) -c $< -o $@
##将s文件编译成目标文件(.o)##
$(EXT_OBJ_PATH)%.o : %$(suffix $(ASM_SUFFIX))
$(CC) $(ASSEMBLER_FLAGS) -c $< -o $@
##将c文件编译成汇编文件(.s)##
$(EXT_LST_PATH)%$(ASM_SUF) : %$(suffix $(C_SUFFIX))
$(CC) $(COMPILE_FLAGS) -S $< -o $@
##将cpp文件编译成汇编文件(.s)##
$(EXT_LST_PATH)%$(ASM_SUF) : %$(suffix $(CPP_SUFFIX))
$(CC) $(COMPILE_FLAGS) -S $< -o $@
CreatePath:
@if test -d $(OUTPUT_PATH);then echo >nul; else $(MKDIR) $(OUTPUT_PATH);fi
@if test -d $(OBJ_PATH); then echo >nul; else $(MKDIR) $(OBJ_PATH);fi
@if test -d $(EXE_PATH); then echo >nul; else $(MKDIR) $(EXE_PATH);fi
@if test -d $(LST_PATH); then echo >nul; else $(MKDIR) $(LST_PATH);fi
clean:
@if test -d $(OBJ_PATH); then $(RM) $(EXT_OBJ_PATH)*.*;
$(RMDIR) $(OBJ_PATH); else echo >nul; fi
@if test -d $(EXE_PATH); then $(RM) $(EXT_EXE_PATH)*.*;
$(RMDIR) $(EXE_PATH); else echo >nul; fi
@if test -d $(LST_PATH); then $(RM) $(EXT_LST_PATH)*.*;
$(RMDIR) $(LST_PATH); else echo >nul; fi
@if test -d $(OUTPUT_PATH); then $(RM) $(OUTPUT_PATH)*.*;
$(RMDIR) $(OUTPUT_PATH); else echo >nul; fi
.PHONY: all clean CreatePath size
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