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当建立在AVR Studio的5项目，它将创建一个具有以下内容的.c文件：了AVR Studio 5：编译C++代码
#include <avr/io.h>
int main(void)
{
while(1)
{
//TODO:: Please write your application code
}
}
建设这个C程序工作得很好：
------ Rebuild All started: Project: AVRGCC2, Configuration: Debug AVR ------
Build started.
Project "AVRGCC2.avrgccproj" (ReBuild target(s)):
Target "PreBuildEvent" skipped, due to false condition; ('$(PreBuildEvent)'!='') was evaluated as (''!='').
Target "CoreRebuild" in file "C:\Programme\Atmel\AVR Studio 5.0\Vs\AvrGCC.targets" from project "C:\Dokumente und Einstellungen\tom\Eigene Dateien\AVRStudio\test\AVRGCC2\AVRGCC2\AVRGCC2.avrgccproj" (target "ReBuild" depends on it):
Task "RunAvrGCC"
C:\Programme\Atmel\AVR Studio 5.0\AVR ToolChain\bin\make.exe clean all
rm -rf AVRGCC2.o AVRGCC2.d libAVRGCC2.a AVRGCC2.hex AVRGCC2.eep AVRGCC2.lss AVRGCC2.map
AVRGCC2.c
Invoking: AVR/GNU C Compiler
"C:/Programme/Atmel/AVR Studio 5.0/AVR ToolChain/bin/avr-gcc.exe" -funsigned-char -funsigned-bitfields -O0 -fpack-struct -fshort-enums -g2 -Wall -c -std=gnu99 -mmcu=atmega328p -MD -MP -MF"AVRGCC2.d" -MT"AVRGCC2.d" -o"AVRGCC2.o" ".././AVRGCC2.c"
Finished building: .././AVRGCC2.c
Building target: AVRGCC2.elf
Invoking: AVR/GNU C/C++ Linker
"C:/Programme/Atmel/AVR Studio 5.0/AVR ToolChain/bin/avr-gcc.exe" -mmcu=atmega328p -Wl,-Map=AVRGCC2.map -o AVRGCC2.elf AVRGCC2.o
Finished building target: AVRGCC2.elf
"C:/Programme/Atmel/AVR Studio 5.0/AVR ToolChain/bin/avr-objcopy.exe" -O ihex -R .eeprom -R .fuse -R .lock -R .signature "AVRGCC2.elf" "AVRGCC2.hex"
"C:/Programme/Atmel/AVR Studio 5.0/AVR ToolChain/bin/avr-objdump.exe" -h -S "AVRGCC2.elf" > "AVRGCC2.lss"
"C:/Programme/Atmel/AVR Studio 5.0/AVR ToolChain/bin/avr-objcopy.exe" -j .eeprom --set-section-flags=.eeprom=alloc,load --change-section-lma .eeprom=0 --no-change-warnings -O ihex "AVRGCC2.elf" "AVRGCC2.eep" || exit 0
AVR Memory Usage
----------------
Device: atmega328p
Program: 142 bytes (0.4% Full)
(.text + .data + .bootloader)
Data: 0 bytes (0.0% Full)
(.data + .bss + .noinit)
Done executing task "RunAvrGCC".
Done building target "CoreRebuild" in project "AVRGCC2.avrgccproj".
Target "PostBuildEvent" skipped, due to false condition; ('$(PostBuildEvent)' != '') was evaluated as ('' != '').
Target "ReBuild" in file "C:\Programme\Atmel\AVR Studio 5.0\Vs\Avr.common.targets" from project "C:\Dokumente und Einstellungen\tom\Eigene Dateien\AVRStudio\test\AVRGCC2\AVRGCC2\AVRGCC2.avrgccproj" (entry point):
Done building target "ReBuild" in project "AVRGCC2.avrgccproj".
Done building project "AVRGCC2.avrgccproj".
Build succeeded.
========== Rebuild All: 1 succeeded, 0 failed, 0 skipped ==========
但是，当我将文件扩展名更改为.cpp时，版本会发出警告设备类型未定义（如果尝试使用任何AVR特定寄存器，将会变成错误）：
------ Rebuild All started: Project: AVRGCC2, Configuration: Debug AVR ------
Build started.
Project "AVRGCC2.avrgccproj" (ReBuild target(s)):
Target "PreBuildEvent" skipped, due to false condition; ('$(PreBuildEvent)'!='') was evaluated as (''!='').
Target "CoreRebuild" in file "C:\Programme\Atmel\AVR Studio 5.0\Vs\AvrGCC.targets" from project "C:\Dokumente und Einstellungen\tom\Eigene Dateien\AVRStudio\test\AVRGCC2\AVRGCC2\AVRGCC2.avrgccproj" (target "ReBuild" depends on it):
Task "RunAvrGCC"
C:\Programme\Atmel\AVR Studio 5.0\AVR ToolChain\bin\make.exe clean all
In file included from .././AVRGCC2.cpp:1:0:
c:\programme\atmel\avr studio 5.0\avr toolchain\bin\../lib/gcc/avr/4.5.1/../../../../avr/include/avr/io.h(446,6): #warning "device type not defined"
rm -rf AVRGCC2.o AVRGCC2.d libAVRGCC2.a AVRGCC2.hex AVRGCC2.eep AVRGCC2.lss AVRGCC2.map
AVRGCC2.cpp
Invoking: AVR/GNU CPP Compiler
"C:/Programme/Atmel/AVR Studio 5.0/AVR ToolChain/bin/avr-g++.exe" -MD -MP -MF"AVRGCC2.d" -MT"AVRGCC2.d" -o"AVRGCC2.o" ".././AVRGCC2.cpp"
Finished building: .././AVRGCC2.cpp
Building target: AVRGCC2.elf
Invoking: AVR/GNU C/C++ Linker
"C:/Programme/Atmel/AVR Studio 5.0/AVR ToolChain/bin/avr-gcc.exe" -mmcu=atmega328p -Wl,-Map=AVRGCC2.map -o AVRGCC2.elf AVRGCC2.o
Finished building target: AVRGCC2.elf
"C:/Programme/Atmel/AVR Studio 5.0/AVR ToolChain/bin/avr-objcopy.exe" -O ihex -R .eeprom -R .fuse -R .lock -R .signature "AVRGCC2.elf" "AVRGCC2.hex"
"C:/Programme/Atmel/AVR Studio 5.0/AVR ToolChain/bin/avr-objdump.exe" -h -S "AVRGCC2.elf" > "AVRGCC2.lss"
"C:/Programme/Atmel/AVR Studio 5.0/AVR ToolChain/bin/avr-objcopy.exe" -j .eeprom --set-section-flags=.eeprom=alloc,load --change-section-lma .eeprom=0 --no-change-warnings -O ihex "AVRGCC2.elf" "AVRGCC2.eep" || exit 0
AVR Memory Usage
----------------
Device: atmega328p
Program: 142 bytes (0.4% Full)
(.text + .data + .bootloader)
Data: 0 bytes (0.0% Full)
(.data + .bss + .noinit)
Done executing task "RunAvrGCC".
Done building target "CoreRebuild" in project "AVRGCC2.avrgccproj".
Target "PostBuildEvent" skipped, due to false condition; ('$(PostBuildEvent)' != '') was evaluated as ('' != '').
Target "ReBuild" in file "C:\Programme\Atmel\AVR Studio 5.0\Vs\Avr.common.targets" from project "C:\Dokumente und Einstellungen\tom\Eigene Dateien\AVRStudio\test\AVRGCC2\AVRGCC2\AVRGCC2.avrgccproj" (entry point):
Done building target "ReBuild" in project "AVRGCC2.avrgccproj".
Done building project "AVRGCC2.avrgccproj".
Build succeeded.
========== Rebuild All: 1 succeeded, 0 failed, 0 skipped ==========
比较两个输出表明，对于C代码，它将选项-mmcu=atmega328p添加到avr-gcc.exe，但是对于C++代码，它不会在执行avr-g++.exe时添加。我在使用WinAVR时遇到类似的问题。如何解决这个问题？
我找到了一种解决方法：将所有.cpp文件重命名为.c并定义以下编译器选项：'-x C++ -std = gnu ++ 98'。 – Mot
您能否将您的评论发布为答案并接受它？这样，问题就会停止显示为未答复。 –