我有以下 Makefile:
# Name: Makefile
# Author: <insert your name here>
# Copyright: <insert your copyright message here>
# License: <insert your license reference here>
# DEVICE ....... The AVR device you compile for
# CLOCK ........ Target AVR clock rate in Hertz
# OBJECTS ...... The object files created from your source files. This list is
# usually the same as the list of source files with suffix ".o".
# PROGRAMMER ... Options to avrdude which define the hardware you use for
# uploading to the AVR and the interface where this hardware
# is connected.
# FUSES ........ Parameters for avrdude to flash the fuses appropriately.
CSRC = main.c Sys_init.c BB_Timers.c SPI.c Radio_interface.c
DEVICE = atmega328p
MCU = m328p
CLOCK = 800000
PROGRAMMER = -c dragon_isp
PORT = -P usb
#PROGRAMMER = -c /dev/buspirate
OBJECTS = main.o
FUSES = -U efuse:w:0xff:m -U lfuse:w:0xe2:m -U hfuse:w:0xde:m
OBJECTS = $(CSRC:.c=.o) $(ASRC:.s=.o)
######################################################################
######################################################################
# Tune the lines below only if you know what you are doing:
AVRDUDE = avrdude $(PROGRAMMER) $(PORT) -p $(DEVICE) -vv
COMPILE = avr-gcc -Wall -Os -DF_CPU=$(CLOCK) -mmcu=$(DEVICE) # symbolic targets:
all: main.hex
.c.o:
$(COMPILE) -c $< -o $@
.S.o:
$(COMPILE) -x assembler-with-cpp -c $< -o $@
# "-x assembler-with-cpp" should not be necessary since this is the default
# file type for the .S (with capital S) extension. However, upper case
# characters are not always preserved on Windows. To ensure WinAVR
# compatibility define the file type manually.
.c.s:
$(COMPILE) -S $< -o $@
flash: all
$(AVRDUDE) -U flash:w:main.hex:i
fuse:
$(AVRDUDE) $(FUSES)
install: flash fuse
# if you use a bootloader, change the command below appropriately:
load: all
bootloadHID main.hex
clean:
rm -f main.hex main.elf $(OBJECTS)
# file targets:
main.elf: $(OBJECTS)
$(COMPILE) -o main.elf $(OBJECTS)
main.hex: main.elf
rm -f main.hex
avr-objcopy -j .text -j .data -O ihex main.elf main.hex
# If you have an EEPROM section, you must also create a hex file for the
# EEPROM and add it to the "flash" target.
# Targets for code debugging and analysis:
disasm: main.elf
avr-objdump -d main.elf
cpp:
$(COMPILE) -E main.c
当我使用 make
编译时,出现以下错误:
>> make
avr-gcc -Wall -Os -DF_CPU=800000 -mmcu=atmega328p -o main.elf main.o Sys_init.o BB_Timers.o SPI.o Radio_interface.o
Sys_init.o: In function `System_init':
Sys_init.c:(.text+0x0): undefined reference to `One'
Sys_init.c:(.text+0x2): undefined reference to `One'
BB_Timers.o: In function `__vector_14':
BB_Timers.c:(.text+0x2e): undefined reference to `One'
BB_Timers.c:(.text+0x30): undefined reference to `One'
collect2: error: ld returned 1 exit status
make: *** [Makefile:66: main.elf] Error 1
我尝试过调整 CSRC
的顺序,过去似乎有所作为,但这次却没有。但我觉得这是错误的,因为拥有许多源文件的人如何处理这个问题,比如说,一个大项目?一定有更好的方法。
最佳答案
总结一下对该问题的评论:
在 bb_system.h
的第 25 行中,您放置了以下语句:
extern struct bb_system One;
这意味着在编译文件中的某个位置必须有一个名为 One
且类型为 struct bb_system
的变量
在 Sys_init.c
的第 7 行中,您注释掉了该语句
// struct bb_system One;
它可能会解决这个问题。
修复该行
关于c - AVR-GCC Makefile 链接问题,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/40128462/