1 说明
由于keil 软件需要收费，故有许多公司或者个人希望能够使用makefile 实现编译功能。如此一来，就可以脱离了keil 公司的限制，自由开发。
2 开发环境
（1） windows 操作系统的PC一台。
（2）arm-gcc windows端交叉编译工具链（个人使用版本：gcc-arm-none-eabi-4_7）。
如需下载，可到本人的上传链接下载：
http://download.csdn.net/download/xhoufei2010/10223874
（3） gd32f10x （cortex-m3内核）开发板一块。
3 编写对应的代码
本人的keil 安装目录为D:\develop\keil\，采用makefile 实现编译，操作步骤如下。
3.1 修改启动汇编文件 gd32f10x.s
gd32f10x.s 为系统的启动汇编文件，参考keil 软件安装之后标准的gcc编译器汇编文件修改而来，如果想了解标准源码，可查看keil 的安装目录：D:\develop\keil\ARM\Device\ARM\ARMCM3\Source\GCC\startup_ARMCM3.S
startup_ARMCM3.S 为cortex-m3的启动汇编文件，用于加载向量表等信息，设置环境，让程序可以正常跳转到C代码的main函数。
代码如下：
/* File: startup_ARMCM3.S
* Purpose: startup file for Cortex-M3 devices. Should use with
* GCC for ARM Embedded Processors
* Version: V1.3
* Date: 08 Feb 2012
*
* Copyright (c) 2012, ARM Limited
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of the ARM Limited nor the
names of its contributors may be used to endorse or promote products
derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL ARM LIMITED BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
.syntax unified
.arch armv7-m
.section .stack
.align 3
#ifdef __STACK_SIZE
.equ Stack_Size, __STACK_SIZE
#else
.equ Stack_Size, 0x400
#endif
.globl __StackTop
.globl __StackLimit
__StackLimit:
.space Stack_Size
.size __StackLimit, . - __StackLimit
__StackTop:
.size __StackTop, . - __StackTop
.section .heap
.align 3
#ifdef __HEAP_SIZE
.equ Heap_Size, __HEAP_SIZE
#else
.equ Heap_Size, 0x200
#endif
.globl __HeapBase
.globl __HeapLimit
__HeapBase:
.if Heap_Size
.space Heap_Size
.endif
.size __HeapBase, . - __HeapBase
__HeapLimit:
.size __HeapLimit, . - __HeapLimit
.section .isr_vector
.align 2
.globl __isr_vector
__isr_vector:
.long __StackTop /* Top of Stack */
.long Reset_Handler /* Reset Handler */
.long NMI_Handler /* NMI Handler */
.long HardFault_Handler /* Hard Fault Handler */
.long MemManage_Handler /* MPU Fault Handler */
.long BusFault_Handler /* Bus Fault Handler */
.long UsageFault_Handler /* Usage Fault Handler */
.long 0 /* Reserved */
.long 0 /* Reserved */
.long 0 /* Reserved */
.long 0 /* Reserved */
.long SVC_Handler /* SVCall Handler */
.long DebugMon_Handler /* Debug Monitor Handler */
.long 0 /* Reserved */
.long PendSV_Handler /* PendSV Handler */
.long SysTick_Handler /* SysTick Handler */
/* External interrupts */
.long WWDG_IRQHandler @; Vector Number 16,Window Watchdog
.long LVD_IRQHandler @; Vector Number 17,LVD through EXTI Line detect
.long TAMPER_IRQHandler @; Vector Number 18,Tamper Interrupt
.long RTC_IRQHandler @; Vector Number 19,RTC through EXTI Line
.long FMC_IRQHandler @; Vector Number 20,FMC
.long RCC_IRQHandler @; Vector Number 21,RCC
.long EXTI0_IRQHandler @; Vector Number 22,EXTI Line 0
.long EXTI1_IRQHandler @; Vector Number 23,EXTI Line 1
.long EXTI2_IRQHandler @; Vector Number 24,EXTI Line 2
.long EXTI3_IRQHandler @; Vector Number 25,EXTI Line 3
.long EXTI4_IRQHandler @; Vector Number 26,EXTI Line 4
.long DMA1_Channel1_IRQHandler @; Vector Number 27,DMA1 Channel 1
.long DMA1_Channel2_IRQHandler @; Vector Number 28,DMA1 Channel 2
.long DMA1_Channel3_IRQHandler @; Vector Number 29,DMA1 Channel 3
.long DMA1_Channel4_IRQHandler @; Vector Number 30,DMA1 Channel 4
.long DMA1_Channel5_IRQHandler @; Vector Number 31,DMA1 Channel 5
.long DMA1_Channel6_IRQHandler @; Vector Number 32,DMA1 Channel 6
.long DMA1_Channel7_IRQHandler @; Vector Number 33,DMA1 Channel 7
.long ADC1_2_IRQHandler @; Vector Number 34,ADC1 and ADC2
.long USB_HP_CAN1_TX_IRQHandler @; Vector Number 35,USB Device High Priority or CAN1 TX
.long USB_LP_CAN1_RX0_IRQHandler @; Vector Number 36,USB Device Low Priority or CAN1 RX0
.long CAN1_RX1_IRQHandler @; Vector Number 37,CAN1 RX1
.long CAN1_SCE_IRQHandler @; Vector Number 38,CAN1 SCE
.long EXTI9_5_IRQHandler @; Vector Number 39,EXTI Line 9..5
.long TIMER1_BRK_IRQHandler @; Vector Number 40,TIMER1 Break
.long TIMER1_UP_IRQHandler @; Vector Number 41,TIMER1 Update
.long TIMER1_TRG_COM_IRQHandler @; Vector Number 42,TIMER1 Break, Update, Trigger and Commutation
.long TIMER1_CC_IRQHandler @; Vector Number 43,TIMER1 Capture Compare
.long TIMER2_IRQHandler @; Vector Number 44,TIMER2
.long TIMER3_IRQHandler @; Vector Number 45,TIMER3
.long TIMER4_IRQHandler @; Vector Number 46,TIMER4
.long I2C1_EV_IRQHandler @; Vector Number 47,I2C1 Event
.long I2C1_ER_IRQHandler @; Vector Number 48,I2C1 Error
.long I2C2_EV_IRQHandler @; Vector Number 49,I2C2 Event
.long I2C2_ER_IRQHandler @; Vector Number 50,I2C1 Error
.long SPI1_IRQHandler @; Vector Number 51,SPI1
.long SPI2_IRQHandler @; Vector Number 52,SPI2
.long USART1_IRQHandler @; Vector Number 53,USART1
.long USART2_IRQHandler @; Vector Number 54,USART2
.long USART3_IRQHandler @; Vector Number 55,USART3
.long EXTI15_10_IRQHandler @; Vector Number 56,External Line[15:10]
.long RTCAlarm_IRQHandler @; Vector Number 57,RTC Alarm through EXTI Line
.long USBWakeUp_IRQHandler @; Vector Number 58,USB Device WakeUp from suspend through EXTI Line
.long TIMER8_BRK_IRQHandler @; Vector Number 59,TIMER8 Break
.long TIMER8_UP_IRQHandler @; Vector Number 60,TIMER8 Update
.long TIMER8_TRG_COM_IRQHandler @; Vector Number 61,TIMER8 Trigger and Commutation
.long TIMER8_CC_IRQHandler @; Vector Number 62,TIMER8 Capture Compare
.long ADC3_IRQHandler @; Vector Number 63,ADC3
.long EXMC_IRQHandler @; Vector Number 64,EXMC
.long SDIO_IRQHandler @; Vector Number 65,SDIO
.long TIMER5_IRQHandler @; Vector Number 66,TIMER5
.long SPI3_IRQHandler @; Vector Number 67,SPI3
.long UART4_IRQHandler @; Vector Number 68,UART4
.long UART5_IRQHandler @; Vector Number 69,UART5
.long TIMER6_IRQHandler @; Vector Number 70,TIMER6
.long TIMER7_IRQHandler @; Vector Number 71,TIMER7
.long DMA2_Channel1_IRQHandler @; Vector Number 72,DMA2 Channel1
.long DMA2_Channel2_IRQHandler @; Vector Number 73,DMA2 Channel2
.long DMA2_Channel3_IRQHandler @; Vector Number 74,DMA2 Channel3
.long DMA2_Channel4_5_IRQHandler @; Vector Number 75,DMA2 Channel4 and Channel5
.size __isr_vector, . - __isr_vector
.text
.thumb
.thumb_func
.align 2
.globl Reset_Handler
.type Reset_Handler, %function
Reset_Handler:
/* Loop to copy data from read only memory to RAM. The ranges
* of copy from/to are specified by following symbols evaluated in
* linker script.
* __etext: End of code section, i.e., begin of data sections to copy from.
* __data_start__/__data_end__: RAM address range that data should be
* copied to. Both must be aligned to 4 bytes boundary. */
ldr r1, =__etext
ldr r2, =__data_start__
ldr r3, =__data_end__
#if 1
/* Here are two copies of loop implemenations. First one favors code size
* and the second one favors performance. Default uses the first one.
* Change to "#if 0" to use the second one */
.flash_to_ram_loop:
cmp r2, r3
ittt lt
ldrlt r0, [r1], #4
strlt r0, [r2], #4
blt .flash_to_ram_loop
#else
subs r3, r2
ble .flash_to_ram_loop_end
.flash_to_ram_loop:
subs r3, #4
ldr r0, [r1, r3]
str r0, [r2, r3]
bgt .flash_to_ram_loop
.flash_to_ram_loop_end:
#endif
#ifndef __NO_SYSTEM_INIT
ldr r0, =SystemInit
blx r0
#endif
ldr r0, =_start
bx r0
.pool
.size Reset_Handler, . - Reset_Handler
/* Macro to define default handlers. Default handler
* will be weak symbol and just dead loops. They can be
* overwritten by other handlers */
.macro def_irq_handler handler_name
.align 1
.thumb_func
.weak \handler_name
.type \handler_name, %function
\handler_name :
b .
.size \handler_name, . - \handler_name
.endm
/* Dummy Exception Handlers (infinite loops which can be modified) */
def_irq_handler NMI_Handler
def_irq_handler HardFault_Handler
def_irq_handler MemManage_Handler
def_irq_handler BusFault_Handler
def_irq_handler UsageFault_Handler
def_irq_handler SVC_Handler
def_irq_handler DebugMon_Handler
def_irq_handler PendSV_Handler
def_irq_handler SysTick_Handler
def_irq_handler Default_Handler
/* ToDo: Add here the export definition for the device specific external interrupts handler */
def_irq_handler WWDG_IRQHandler
def_irq_handler LVD_IRQHandler
def_irq_handler TAMPER_IRQHandler
def_irq_handler RTC_IRQHandler
def_irq_handler FMC_IRQHandler
def_irq_handler RCC_IRQHandler
def_irq_handler EXTI0_IRQHandler
def_irq_handler EXTI1_IRQHandler
def_irq_handler EXTI2_IRQHandler
def_irq_handler EXTI3_IRQHandler
def_irq_handler EXTI4_IRQHandler
def_irq_handler DMA1_Channel1_IRQHandler
def_irq_handler DMA1_Channel2_IRQHandler
def_irq_handler DMA1_Channel3_IRQHandler
def_irq_handler DMA1_Channel4_IRQHandler
def_irq_handler DMA1_Channel5_IRQHandler
def_irq_handler DMA1_Channel6_IRQHandler
def_irq_handler DMA1_Channel7_IRQHandler
def_irq_handler ADC1_2_IRQHandler
def_irq_handler USB_HP_CAN1_TX_IRQHandler
def_irq_handler USB_LP_CAN1_RX0_IRQHandler
def_irq_handler CAN1_RX1_IRQHandler
def_irq_handler CAN1_SCE_IRQHandler
def_irq_handler EXTI9_5_IRQHandler
def_irq_handler TIMER1_BRK_IRQHandler
def_irq_handler TIMER1_UP_IRQHandler
def_irq_handler TIMER1_TRG_COM_IRQHandler
def_irq_handler TIMER1_CC_IRQHandler
def_irq_handler TIMER2_IRQHandler
def_irq_handler TIMER3_IRQHandler
def_irq_handler TIMER4_IRQHandler
def_irq_handler I2C1_EV_IRQHandler
def_irq_handler I2C1_ER_IRQHandler
def_irq_handler I2C2_EV_IRQHandler
def_irq_handler I2C2_ER_IRQHandler
def_irq_handler SPI1_IRQHandler
def_irq_handler SPI2_IRQHandler
def_irq_handler USART1_IRQHandler
def_irq_handler USART2_IRQHandler
def_irq_handler USART3_IRQHandler
def_irq_handler EXTI15_10_IRQHandler
def_irq_handler RTCAlarm_IRQHandler
def_irq_handler USBWakeUp_IRQHandler
def_irq_handler TIMER8_BRK_IRQHandler
def_irq_handler TIMER8_UP_IRQHandler
def_irq_handler TIMER8_TRG_COM_IRQHandler
def_irq_handler TIMER8_CC_IRQHandler
def_irq_handler ADC3_IRQHandler
def_irq_handler EXMC_IRQHandler
def_irq_handler SDIO_IRQHandler
def_irq_handler TIMER5_IRQHandler
def_irq_handler SPI3_IRQHandler
def_irq_handler UART4_IRQHandler
def_irq_handler UART5_IRQHandler
def_irq_handler TIMER6_IRQHandler
def_irq_handler TIMER7_IRQHandler
def_irq_handler DMA2_Channel1_IRQHandler
def_irq_handler DMA2_Channel2_IRQHandler
def_irq_handler DMA2_Channel3_IRQHandler
def_irq_handler DMA2_Channel4_5_IRQHandler
.end
3.2 编写链接文件gd32f10x.ld
gd32f10x.ld 为链接文件，用于确定设备堆栈起始地址和FLASH大小配置等。
gd32f10x.ld 为参考keil安装目录下D:\develop\keil\ARM\Device\ARM\ARMCM3\Source\GCC\gcc_arm.ld 修改地址得到，用于确定设备堆栈起始地址和FLASH大小配置等。其中的地址，可以查看datasheet 了解，或者打开keil 的标准工程查看，如下图所示。
图 3-1 工程 rom、ram 地址配置图
修改后的gd32f10x.ld 代码如下
/* Linker script to configure memory regions. */
MEMORY
{
FLASH (rx) : ORIGIN = 0x08000000, LENGTH = 0x8000 /* 32k */
RAM (rwx) : ORIGIN = 0x20000000, LENGTH = 0x5000 /* 20k */
}
/* Library configurations */
GROUP(libgcc.a libc.a libm.a libnosys.a)
/* Linker script to place sections and symbol values. Should be used together
* with other linker script that defines memory regions FLASH and RAM.
* It references following symbols, which must be defined in code:
* Reset_Handler : Entry of reset handler
*
* It defines following symbols, which code can use without definition:
* __exidx_start
* __exidx_end
* __etext
* __data_start__
* __preinit_array_start
* __preinit_array_end
* __init_array_start
* __init_array_end
* __fini_array_start
* __fini_array_end
* __data_end__
* __bss_start__
* __bss_end__
* __end__
* end
* __HeapLimit
* __StackLimit
* __StackTop
* __stack
*/
ENTRY(Reset_Handler)
SECTIONS
{
.text :
{
KEEP(*(.isr_vector))
*(.text*)
KEEP(*(.init))
KEEP(*(.fini))
/* .ctors */
*crtbegin.o(.ctors)
*crtbegin?.o(.ctors)
*(EXCLUDE_FILE(*crtend?.o *crtend.o) .ctors)
*(SORT(.ctors.*))
*(.ctors)
/* .dtors */
*crtbegin.o(.dtors)
*crtbegin?.o(.dtors)
*(EXCLUDE_FILE(*crtend?.o *crtend.o) .dtors)
*(SORT(.dtors.*))
*(.dtors)
*(.rodata*)
KEEP(*(.eh_frame*))
} > FLASH
.ARM.extab :
{
*(.ARM.extab* .gnu.linkonce.armextab.*)
} > FLASH
__exidx_start = .;
.ARM.exidx :
{
*(.ARM.exidx* .gnu.linkonce.armexidx.*)
} > FLASH
__exidx_end = .;
__etext = .;
.data : AT (__etext)
{
__data_start__ = .;
*(vtable)
*(.data*)
. = ALIGN(4);
/* preinit data */
PROVIDE_HIDDEN (__preinit_array_start = .);
KEEP(*(.preinit_array))
PROVIDE_HIDDEN (__preinit_array_end = .);
. = ALIGN(4);
/* init data */
PROVIDE_HIDDEN (__init_array_start = .);
KEEP(*(SORT(.init_array.*)))
KEEP(*(.init_array))
PROVIDE_HIDDEN (__init_array_end = .);
. = ALIGN(4);
/* finit data */
PROVIDE_HIDDEN (__fini_array_start = .);
KEEP(*(SORT(.fini_array.*)))
KEEP(*(.fini_array))
PROVIDE_HIDDEN (__fini_array_end = .);
. = ALIGN(4);
/* All data end */
__data_end__ = .;
} > RAM
.bss :
{
__bss_start__ = .;
*(.bss*)
*(COMMON)
__bss_end__ = .;
} > RAM
.heap :
{
__end__ = .;
end = __end__;
*(.heap*)
__HeapLimit = .;
} > RAM
/* .stack_dummy section doesn't contains any symbols. It is only
* used for linker to calculate size of stack sections, and assign
* values to stack symbols later */
.stack_dummy :
{
*(.stack)
} > RAM
/* Set stack top to end of RAM, and stack limit move down by
* size of stack_dummy section */
__StackTop = ORIGIN(RAM) + LENGTH(RAM);
__StackLimit = __StackTop - SIZEOF(.stack_dummy);
PROVIDE(__stack = __StackTop);
/* Check if data + heap + stack exceeds RAM limit */
ASSERT(__StackLimit >= __HeapLimit, "region RAM overflowed with stack")
}
3.3 编写makefile
makefile 中，根据自己的需要增加和修改内容。
INCDIR += -I $(ROOTDIR)/System_file/include该文件夹的内容，为keil 安装目录下的一些头文件拷贝过来，大家可根据需要，去自己的keil 安装目录下拷贝，如果缺少对应的代码，可能会编译报错。本人的keil 安装目录为D:\develop\keil\
故需要从如下几个目录拷贝源码至$(ROOTDIR)/System_file/include
D:\develop\keil\ARM\RV31\INC
D:\develop\keil\ARM\CMSIS\Include
D:\develop\keil\ARM\Inc\GD\GD32F10x makefile 的内容如下：
BIN = bin
OBJ = obj
OUTPUT = $(BIN)/$(TARGET)
ROOTDIR = .
# Compiler & Linker
CROSS_COMPILE=arm-none-eabi-
CC=$(CROSS_COMPILE)gcc
CXX=$(CROSS_COMPILE)g++
AS=$(CROSS_COMPILE)as
AR=$(CROSS_COMPILE)ar
LD=$(CROSS_COMPILE)ld
OBJDUMP=$(CROSS_COMPILE)objdump
OBJCOPY=$(CROSS_COMPILE)objcopy
STRIP=$(CROSS_COMPILE)strip
############# CFLAGS ##############
# Options for specific architecture
ARCH_FLAGS= -mthumb -mcpu=cortex-m3
DEFS += -DUSE_STDPERIPH_DRIVER
DEFS += -DUSE_GD32F103C_EVAL
DEFS += -DGD32F10X_HD
CFLAGS=$(ARCH_FLAGS) $(DEFS) $(INCDIR) -ffunction-sections -g -Os -std=gnu99 \
############# LFLAGS ##############
LFLAGS =
LFLAGS += -T gd32f10x.ld -Wl,-Map=$(OUTPUT).map -mthumb -mcpu=cortex-m3 -Wl,--gc-sections -lm
####################
LIBS =
##########
VPATH = $(wildcard $(ROOTDIR)/*) $(wildcard $(ROOTDIR)/*/*) $(wildcard $(ROOTDIR)/*/*/*) \
$(wildcard $(ROOTDIR)/*/*/*/*) $(wildcard $(ROOTDIR)/*/*/*/*/*) $(wildcard $(ROOTDIR)/*/*/*/*/*/*) \
$(wildcard $(ROOTDIR)/*/*/*/*/*/*/*) \
############# include ##############
INCDIR =
INCDIR += -I $(ROOTDIR)/Examples/USB_IAP/inc
INCDIR += -I $(ROOTDIR)/Firmware/CMSIS
INCDIR += -I $(ROOTDIR)/Firmware/GD32F10x_StdPeriph_Driver/inc
INCDIR += -I $(ROOTDIR)/Firmware/GD32_USB_Device_Driver/inc
INCDIR += -I $(ROOTDIR)/Firmware/GD32_USB_Device_Library/Class/IAP/inc
INCDIR += -I $(ROOTDIR)/Firmware/GD32_USB_Device_Library/Core/inc
INCDIR += -I $(ROOTDIR)/Utilities/GD32_EVAL/GD32103C_EVAL
INCDIR += -I $(ROOTDIR)/Utilities/GD32_EVAL/Common
INCDIR += -I $(ROOTDIR)/Examples/USB_IAP/Pax/pax_inc
INCDIR += -I $(ROOTDIR)/System_file/include
############# source ##############
ASM_OBJECTS = gd32f10x_init.o
C_OBJECTS = main.o \
system_gd32f10x.o
###############################
ASM_OBJECTS_DDR = $(addprefix $(OBJ)/, $(ASM_OBJECTS))
C_OBJECTS_DDR = $(addprefix $(OBJ)/, $(C_OBJECTS))
############# build ##############
all: $(OUTPUT).elf
$(OUTPUT).elf: $(ASM_OBJECTS_DDR) $(C_OBJECTS_DDR)
$(CC) -o $(OUTPUT).elf $^ $(LIBS) $(LFLAGS)
$(OBJDUMP) -D $(OUTPUT).elf > $(BIN)/asm.txt
$(OBJCOPY) -O binary $(OUTPUT).elf $(OUTPUT).bin
$(OBJCOPY) -O ihex $(OUTPUT).elf $(OUTPUT).hex
$(C_OBJECTS_DDR): $(OBJ)/%.o: %.c
echo CC $<
$(CC) $(CFLAGS) -c -o $@ $<
$(ASM_OBJECTS_DDR): $(OBJ)/%.o: %.S
echo CC $<
$(CC) $(CFLAGS) -c -o $@ $<
############# clean ##############
clean:
-rm -f $(OBJ)/*.* $(BIN)/*.*
注意，其中system_gd32f10x.o为工程的源码，其中有SystemInit 函数，用于初始化时钟，如果没有该system_gd32f10x.o，编译过程中，会提示SystemInit 函数没有定义，报错。
注意：有些项目的源码由于优化等级的问题，会导致无法运行正常，这时候需要修改优化等级，如-Os修改为-O1
CFLAGS=$(ARCH_FLAGS) $(DEFS) $(INCDIR) -ffunction-sections -g -O1 -std=gnu993.4 SystemInit 没有定义问题
如果没有system_gd32f10x.o，编译过程中，会提示SystemInit 函数没有定义，报错。解决方案3选1：
（1）找到对应的system_gd32f10x.c和system_gd32f10x.h 源码添加至makefile编译。其中system_gd32f10x.c 里面包含了SystemInit 函数。
（2）自己编写一个文件，文件中包含了SystemInit 函数申明，函数内容留空，这样也可以解决问题。
（3） 注释掉gd32f10x_init.S 中的SystemInit 部分代码。
/*
#ifndef __NO_SYSTEM_INIT
ldr r0, =SystemInit
blx r0
#endif
*/3.5 编写bat 编译脚本
由于gcc编译器为 windows端，则编写bat脚本，用于执行makefile，脚本名称为Build_Debug.bat
set PATH=../../tools/gcc-arm-none-eabi-4_7/bin;C:\make381;C:\cygwin\bin;
Set DATETIME=%date:~0,4%%date:~5,2%%date:~8,2%
set MON_VER=1.11
rm -f ./bin/*.elf ./bin/*.hex ./bin/*.map ./bin/*.bin ./bin/*.txt
set USE_AREA=C
set TARGET=GD32_Debug
make -B all
其中，set PATH=../../tools/gcc-arm-none-eabi-4_7/bin，用于设置gcc的工具链路径，跟进自己的路径进行修改。
3.6 增加编译文件夹
在目录下，新建 bin、obj 两个文件夹，用于保存编译的文件，不然编译过程中会提示找不到文件夹。
3.7 编译
1、在window 端进入dos命令行
2、进入到自己的代码目录
e:
cd E:\Project\gd32\test\3、准备好编译文件后，进行编译
其中，该目录下有 makefile、Build_Debug.bat、gd32f10x.ld、gd32f10x_init.S、obj文件夹、bin文件夹、需要编译的 .C 和 .H 源代码
运行编译脚本，进行编译
E:\Project\gd32\test>Build_Debug.bat