Atmel Studio 6链接器导致多个定义错误

Question

我在Atmel Studio 6.1中遇到一个问题，由于多个定义错误而无法编译，这似乎是由链接器复制"Libraries/lib_mcu/ can /can_isp_protocol.o Libraries/lib_mcu/can/can_isp_protocol.o“引起的。有人知道为什么会这样做吗？下面是编译器输出的列表。

    Task "RunCompilerTask"
    C:\Program Files (x86)\Atmel\Atmel Studio 6.1\shellUtils\make.exe all 
    Building file: ../Libraries/lib_mcu/can/can_drv.c
    Invoking: AVR/GNU C Compiler : 3.4.2
    "C:\Program Files (x86)\Atmel\Atmel Toolchain\AVR8 GCC\Native\3.4.2.939\avr8-gnu-toolchain\bin\avr-gcc.exe"  -funsigned-char -funsigned-bitfields -DDEBUG  -I".." -I"../Libraries" -I"../Libraries/lib_board" -I"../Libraries/lib_mcu" -I"../Libraries/lib_mcu/can" -I"../Libraries/lib_mcu/eeprom" -I"../Libraries/lib_mcu/flash" -I"../Libraries/lib_module/isp"  -Os -ffunction-sections -fdata-sections -fpack-struct -fshort-enums -mrelax -g2 -Wall -mmcu=at90can128 -c -std=gnu99 -MD -MP -MF "Libraries/lib_mcu/can/can_drv.d" -MT"Libraries/lib_mcu/can/can_drv.d" -MT"Libraries/lib_mcu/can/can_drv.o"   -o "Libraries/lib_mcu/can/can_drv.o" "../Libraries/lib_mcu/can/can_drv.c"
    Finished building: ../Libraries/lib_mcu/can/can_drv.c
    Building file: ../Libraries/lib_mcu/can/can_isp_protocol.c
    Invoking: AVR/GNU C Compiler : 3.4.2
    "C:\Program Files (x86)\Atmel\Atmel Toolchain\AVR8 GCC\Native\3.4.2.939\avr8-gnu-toolchain\bin\avr-gcc.exe"  -funsigned-char -funsigned-bitfields -DDEBUG  -I".." -I"../Libraries" -I"../Libraries/lib_board" -I"../Libraries/lib_mcu" -I"../Libraries/lib_mcu/can" -I"../Libraries/lib_mcu/eeprom" -I"../Libraries/lib_mcu/flash" -I"../Libraries/lib_module/isp"  -Os -ffunction-sections -fdata-sections -fpack-struct -fshort-enums -mrelax -g2 -Wall -mmcu=at90can128 -c -std=gnu99 -MD -MP -MF "Libraries/lib_mcu/can/can_isp_protocol.d" -MT"Libraries/lib_mcu/can/can_isp_protocol.d" -MT"Libraries/lib_mcu/can/can_isp_protocol.o"   -o "Libraries/lib_mcu/can/can_isp_protocol.o" "../Libraries/lib_mcu/can/can_isp_protocol.c"
    Finished building: ../Libraries/lib_mcu/can/can_isp_protocol.c
    Building file: ../Libraries/lib_mcu/can/reduced_can_lib.c
    Invoking: AVR/GNU C Compiler : 3.4.2
    "C:\Program Files (x86)\Atmel\Atmel Toolchain\AVR8 GCC\Native\3.4.2.939\avr8-gnu-toolchain\bin\avr-gcc.exe"  -funsigned-char -funsigned-bitfields -DDEBUG  -I".." -I"../Libraries" -I"../Libraries/lib_board" -I"../Libraries/lib_mcu" -I"../Libraries/lib_mcu/can" -I"../Libraries/lib_mcu/eeprom" -I"../Libraries/lib_mcu/flash" -I"../Libraries/lib_module/isp"  -Os -ffunction-sections -fdata-sections -fpack-struct -fshort-enums -mrelax -g2 -Wall -mmcu=at90can128 -c -std=gnu99 -MD -MP -MF "Libraries/lib_mcu/can/reduced_can_lib.d" -MT"Libraries/lib_mcu/can/reduced_can_lib.d" -MT"Libraries/lib_mcu/can/reduced_can_lib.o"   -o "Libraries/lib_mcu/can/reduced_can_lib.o" "../Libraries/lib_mcu/can/reduced_can_lib.c"
    Finished building: ../Libraries/lib_mcu/can/reduced_can_lib.c
    Building file: ../Libraries/lib_mcu/eeprom/eeprom_lib.c
    Invoking: AVR/GNU C Compiler : 3.4.2
    "C:\Program Files (x86)\Atmel\Atmel Toolchain\AVR8 GCC\Native\3.4.2.939\avr8-gnu-toolchain\bin\avr-gcc.exe"  -funsigned-char -funsigned-bitfields -DDEBUG  -I".." -I"../Libraries" -I"../Libraries/lib_board" -I"../Libraries/lib_mcu" -I"../Libraries/lib_mcu/can" -I"../Libraries/lib_mcu/eeprom" -I"../Libraries/lib_mcu/flash" -I"../Libraries/lib_module/isp"  -Os -ffunction-sections -fdata-sections -fpack-struct -fshort-enums -mrelax -g2 -Wall -mmcu=at90can128 -c -std=gnu99 -MD -MP -MF "Libraries/lib_mcu/eeprom/eeprom_lib.d" -MT"Libraries/lib_mcu/eeprom/eeprom_lib.d" -MT"Libraries/lib_mcu/eeprom/eeprom_lib.o"   -o "Libraries/lib_mcu/eeprom/eeprom_lib.o" "../Libraries/lib_mcu/eeprom/eeprom_lib.c"
    Finished building: ../Libraries/lib_mcu/eeprom/eeprom_lib.c
    Building file: ../Libraries/lib_mcu/flash/flash_boot_drv.c
    Invoking: AVR/GNU C Compiler : 3.4.2
    "C:\Program Files (x86)\Atmel\Atmel Toolchain\AVR8 GCC\Native\3.4.2.939\avr8-gnu-toolchain\bin\avr-gcc.exe"  -funsigned-char -funsigned-bitfields -DDEBUG  -I".." -I"../Libraries" -I"../Libraries/lib_board" -I"../Libraries/lib_mcu" -I"../Libraries/lib_mcu/can" -I"../Libraries/lib_mcu/eeprom" -I"../Libraries/lib_mcu/flash" -I"../Libraries/lib_module/isp"  -Os -ffunction-sections -fdata-sections -fpack-struct -fshort-enums -mrelax -g2 -Wall -mmcu=at90can128 -c -std=gnu99 -MD -MP -MF "Libraries/lib_mcu/flash/flash_boot_drv.d" -MT"Libraries/lib_mcu/flash/flash_boot_drv.d" -MT"Libraries/lib_mcu/flash/flash_boot_drv.o"   -o "Libraries/lib_mcu/flash/flash_boot_drv.o" "../Libraries/lib_mcu/flash/flash_boot_drv.c"
    Finished building: ../Libraries/lib_mcu/flash/flash_boot_drv.c
    Building file: ../Libraries/lib_mcu/flash/flash_boot_lib.c
    Invoking: AVR/GNU C Compiler : 3.4.2
    "C:\Program Files (x86)\Atmel\Atmel Toolchain\AVR8 GCC\Native\3.4.2.939\avr8-gnu-toolchain\bin\avr-gcc.exe"  -funsigned-char -funsigned-bitfields -DDEBUG  -I".." -I"../Libraries" -I"../Libraries/lib_board" -I"../Libraries/lib_mcu" -I"../Libraries/lib_mcu/can" -I"../Libraries/lib_mcu/eeprom" -I"../Libraries/lib_mcu/flash" -I"../Libraries/lib_module/isp"  -Os -ffunction-sections -fdata-sections -fpack-struct -fshort-enums -mrelax -g2 -Wall -mmcu=at90can128 -c -std=gnu99 -MD -MP -MF "Libraries/lib_mcu/flash/flash_boot_lib.d" -MT"Libraries/lib_mcu/flash/flash_boot_lib.d" -MT"Libraries/lib_mcu/flash/flash_boot_lib.o"   -o "Libraries/lib_mcu/flash/flash_boot_lib.o" "../Libraries/lib_mcu/flash/flash_boot_lib.c"
    Finished building: ../Libraries/lib_mcu/flash/flash_boot_lib.c
    Building file: ../Libraries/lib_module/isp/isp_lib.c
    Invoking: AVR/GNU C Compiler : 3.4.2
    "C:\Program Files (x86)\Atmel\Atmel Toolchain\AVR8 GCC\Native\3.4.2.939\avr8-gnu-toolchain\bin\avr-gcc.exe"  -funsigned-char -funsigned-bitfields -DDEBUG  -I".." -I"../Libraries" -I"../Libraries/lib_board" -I"../Libraries/lib_mcu" -I"../Libraries/lib_mcu/can" -I"../Libraries/lib_mcu/eeprom" -I"../Libraries/lib_mcu/flash" -I"../Libraries/lib_module/isp"  -Os -ffunction-sections -fdata-sections -fpack-struct -fshort-enums -mrelax -g2 -Wall -mmcu=at90can128 -c -std=gnu99 -MD -MP -MF "Libraries/lib_module/isp/isp_lib.d" -MT"Libraries/lib_module/isp/isp_lib.d" -MT"Libraries/lib_module/isp/isp_lib.o"   -o "Libraries/lib_module/isp/isp_lib.o" "../Libraries/lib_module/isp/isp_lib.c"
    Finished building: ../Libraries/lib_module/isp/isp_lib.c
    Building file: .././main_can_bootloader_example.c
    Invoking: AVR/GNU C Compiler : 3.4.2
    "C:\Program Files (x86)\Atmel\Atmel Toolchain\AVR8 GCC\Native\3.4.2.939\avr8-gnu-toolchain\bin\avr-gcc.exe"  -funsigned-char -funsigned-bitfields -DDEBUG  -I".." -I"../Libraries" -I"../Libraries/lib_board" -I"../Libraries/lib_mcu" -I"../Libraries/lib_mcu/can" -I"../Libraries/lib_mcu/eeprom" -I"../Libraries/lib_mcu/flash" -I"../Libraries/lib_module/isp"  -Os -ffunction-sections -fdata-sections -fpack-struct -fshort-enums -mrelax -g2 -Wall -mmcu=at90can128 -c -std=gnu99 -MD -MP -MF "main_can_bootloader_example.d" -MT"main_can_bootloader_example.d" -MT"main_can_bootloader_example.o"   -o "main_can_bootloader_example.o" ".././main_can_bootloader_example.c"
    Finished building: .././main_can_bootloader_example.c
    Building target: CAN-Bootloader.elf
    Invoking: AVR/GNU Linker : 3.4.2
    "C:\Program Files (x86)\Atmel\Atmel Toolchain\AVR8 GCC\Native\3.4.2.939\avr8-gnu-toolchain\bin\avr-gcc.exe" -o CAN-Bootloader.elf  Libraries/lib_mcu/can/can_drv.o Libraries/lib_mcu/can/can_isp_protocol.o Libraries/lib_mcu/can/can_isp_protocol.o Libraries/lib_mcu/can/reduced_can_lib.o Libraries/lib_mcu/eeprom/eeprom_lib.o Libraries/lib_mcu/flash/flash_boot_drv.o Libraries/lib_mcu/flash/flash_boot_lib.o Libraries/lib_module/isp/isp_lib.o Libraries/lib_module/isp/isp_lib.o main_can_bootloader_example.o   -Wl,-Map="CAN-Bootloader.map" -Wl,--start-group -Wl,-lm  -Wl,--end-group -Wl,--gc-sections -mrelax -Wl,-section-start=.text=0x1e000  -mmcu=at90can128 

Answer 1

链接器在其命令行上有两次Libraries/lib_mcu/can/can_isp_protocol.o。由于定义重复，链接失败。

由于我使用的不是Atmel Studio 6，因此无法描述删除重复项的确切步骤。

1. 您可能已经向项目中添加了两次can_isp_protocol.c。检查项目中的文件列表。检查项目选项中的链接器设置。
2. 它可能会在(生成/手动创建的)Makefile中显示两倍:搜索OBJECTS或OBJS (通常情况下，搜索can_isp_protocol，不带扩展名)，可能如下所示：

OBJECTS = can_isp_protocol.o can_isp_protocol.o x.o y.o