首先明白編譯的目標文件是啥，搞單片機一般要用到的就是.hex,.bin,.elf. 而有了.elf就能轉換成*.hex和*.bin.
所以目標是生成*.elf文件，而elf文件是由*.o文件鏈接而成，.o文件是由.c，*.cpp, .s等文件生成。*

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再了解一下makefile的簡單語法
如
AXX = BXX，就是聲明AXX并賦值為BXX
AXX = BXX CXX DXX 就是聲明AXX并賦值為BXX CXX DXX
EXX = $(AXX) 就是聲明EXX并引用AXX所包含的內容，沿用上面的話EXX就是BXX CXX DXX，而不是AXX

要生成*.o文件的話就要找到所有的頭文件路徑

# Working directories # 根目錄 ROOT := $(patsubst %/,%,$(dir $(lastword $(MAKEFILE_LIST))))# 工程目錄 TARGET_INCLUDE_DIR = $(ROOT)/cores # 庫目錄 SYSTEM_INC = $(ROOT)/system/inc # 全部目錄 INCLUDES = $(SYSTEM_INC) $(TARGET_INCLUDE_DIR) $(TARGET_STARTUP_DIR)

以及所有源文件

#查找所有c文件 SYSTEM_SRC = $(wildcard $(SYSTEM_DIR)/*.c) TARGET_SRC = $(wildcard $(TARGET_SRC_DIR)/*.c) #還有啟動文件 TARGET_STARTUP_SRC = $(ROOT)/variants/$(TARGET)/$(TARGET)_STARTUP.s

然后定義編譯工具

# Tool names ARM_SDK_PREFIX ?= arm-none-eabi- CROSS_CC := $(ARM_SDK_PREFIX)gcc CROSS_CXX := $(ARM_SDK_PREFIX)g++ OBJCOPY := $(ARM_SDK_PREFIX)objcopy SIZE := $(ARM_SDK_PREFIX)size AR := $(ARM_SDK_PREFIX)ar

再定義編譯的選項，要根據各自單片機的需要加上去（‘\’的意思是內容沒有結束，接下一行）

#build flags ARCH_FLAGS = -mthumb -mcpu=cortex-m4 CFLAGS = \$(ARCH_FLAGS) \$(addprefix -I,$(INCLUDES)) \-c \-O2 \-g \-ffast-math \-std=gnu11 \-Wall \-ffunction-sections \-fdata-sections \-fsingle-precision-constant \-Wdouble-promotion \-Wunsafe-loop-optimizations \-save-temps=obj \-MMD \-MP \ ASFLAGS = $(ARCH_FLAGS) \-x assembler-with-cpp \$(addprefix -I,$(INCLUDES)) \-MMD -MP

準備開始生成了，定義好要生成的目標
makefile的第一個xxxx : yyyy格式的內容會自動成為makefile的最終目標,xxxx為目標，yyyy為生成目標所需的依賴，makefile會自動尋找目標所需的全部依賴，包含依賴的依賴

#獲取當前系統時間 DATE_TIME = $(shell date +"%Y-%M-%d-%H:%M:%S") #要輸出的目標，不列出來可能不輸出 OUTPUT: $(TARGET_BIN) $(TARGET_HEX)

下面是各個依賴的生成
格式就是各個工具的使用方式
加@會隱藏編譯過程中的指令
$<是指依賴的第一個
$@是指目標

#command tips visible V1 = @ #command visible V0 = @ $(TARGET_BIN): $(TARGET_ELF)$(V0) echo "$(DATE_TIME) Generating binFile ... $@"$(V1) $(OBJCOPY) -O binary $< $@$(TARGET_HEX): $(TARGET_ELF)$(V0) echo "$(DATE_TIME) Generating hexFile ... $@"$(V1) $(OBJCOPY) -O ihex $< $@ $(TARGET_ELF): $(TARGET_OBJS)$(V0) echo "$(DATE_TIME) Linking everyting together... $@"$(V1)$(CROSS_CC) -o $@ $^ $(LDFLAGS)$(V0) $(SIZE) $(TARGET_ELF)$(TARGET_LIB): $(TARGET_LIB_OBJS)$(V0) echo "$(DATE_TIME) Linking static library... $@"$(V1) $(AR) -rc $@ $^$(OBJECT_DIR)/$(TARGET)/%.o: %.c $(V0) echo "$(DATE_TIME) compiling... $<"$(V1) mkdir -p $(dir $@)$(V1) $(CROSS_CC) -c -o $@ $(CFLAGS)$< $(OBJECT_DIR)/$(TARGET)/%.o: %.s $(V0) echo "$(DATE_TIME) Assembling... $<"$(V1) mkdir -p $(dir $@)$(V1) $(CROSS_CC) -c -o $@ $(ASFLAGS) $<$(OBJECT_DIR)/$(TARGET)/%.o: %.S $(V0) echo "$(DATE_TIME) Assembling... $<"$(V1) mkdir -p $(dir $@)$(V1) $(CROSS_CC) -c -o $@ $(ASFLAGS) $< clean:$(V0) echo "Cleaning $(TARGET)"$(V0) rm -f $(CLEAN_ARTIFACTS)$(V0) rm -rf $(OBJECT_DIR)$(V0) rm -rf $(OBJECT_DIR)/$(TARGET)$(V0) echo "Cleaning $(TARGET) succeeded."

總結

以上是生活随笔為你收集整理的怎么写CORTEX在windows用arm-none-eabi-gcc编译时的makefile的全部內容，希望文章能夠幫你解決所遇到的問題。

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