AVR Studio 5: компиляция кода C++

при создании проекта в AVR Studio 5 он создает a .файл с следующим содержимым:

#include <avr/io.h>

int main(void)
{
    while(1)
    {
        //TODO:: Please write your application code 
    }
}

построение этой программы C работает просто отлично:

------ Rebuild All started: Project: AVRGCC2, Configuration: Debug AVR ------
Build started.
Project "AVRGCC2.avrgccproj" (ReBuild target(s)):
Target "PreBuildEvent" skipped, due to false condition; ('$(PreBuildEvent)'!='') was evaluated as (''!='').
Target "CoreRebuild" in file "C:ProgrammeAtmelAVR Studio 5.0VsAvrGCC.targets" from project "C:Dokumente und EinstellungentomEigene DateienAVRStudiotestAVRGCC2AVRGCC2AVRGCC2.avrgccproj" (target "ReBuild" depends on it):
    Task "RunAvrGCC"
        C:ProgrammeAtmelAVR Studio 5.0AVR ToolChainbinmake.exe clean all 
        rm -rf  AVRGCC2.o AVRGCC2.d   libAVRGCC2.a  AVRGCC2.hex  AVRGCC2.eep  AVRGCC2.lss AVRGCC2.map
AVRGCC2.c
        Invoking: AVR/GNU C Compiler
        "C:/Programme/Atmel/AVR Studio 5.0/AVR ToolChain/bin/avr-gcc.exe" -funsigned-char -funsigned-bitfields -O0 -fpack-struct -fshort-enums -g2 -Wall -c -std=gnu99  -mmcu=atmega328p   -MD -MP -MF"AVRGCC2.d" -MT"AVRGCC2.d" -o"AVRGCC2.o" ".././AVRGCC2.c"
        Finished building: .././AVRGCC2.c
        Building target: AVRGCC2.elf
        Invoking: AVR/GNU C/C++ Linker
        "C:/Programme/Atmel/AVR Studio 5.0/AVR ToolChain/bin/avr-gcc.exe"  -mmcu=atmega328p  -Wl,-Map=AVRGCC2.map -o AVRGCC2.elf  AVRGCC2.o  
        Finished building target: AVRGCC2.elf
        "C:/Programme/Atmel/AVR Studio 5.0/AVR ToolChain/bin/avr-objcopy.exe" -O ihex -R .eeprom -R .fuse -R .lock -R .signature  "AVRGCC2.elf" "AVRGCC2.hex"
        "C:/Programme/Atmel/AVR Studio 5.0/AVR ToolChain/bin/avr-objdump.exe" -h -S "AVRGCC2.elf" > "AVRGCC2.lss"
        "C:/Programme/Atmel/AVR Studio 5.0/AVR ToolChain/bin/avr-objcopy.exe" -j .eeprom --set-section-flags=.eeprom=alloc,load --change-section-lma .eeprom=0 --no-change-warnings -O ihex "AVRGCC2.elf" "AVRGCC2.eep" || exit 0
        AVR Memory Usage
        ----------------
        Device: atmega328p
        Program:     142 bytes (0.4% Full)
        (.text + .data + .bootloader)
        Data:          0 bytes (0.0% Full)
        (.data + .bss + .noinit)
    Done executing task "RunAvrGCC".
Done building target "CoreRebuild" in project "AVRGCC2.avrgccproj".
Target "PostBuildEvent" skipped, due to false condition; ('$(PostBuildEvent)' != '') was evaluated as ('' != '').
Target "ReBuild" in file "C:ProgrammeAtmelAVR Studio 5.0VsAvr.common.targets" from project "C:Dokumente und EinstellungentomEigene DateienAVRStudiotestAVRGCC2AVRGCC2AVRGCC2.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 ==========

но когда я меняю расширение файла на .cpp, сборка выдает предупреждение тип устройства не определен (что превратится в ошибку при попытке использовать любой регистр AVR):

------ 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:ProgrammeAtmelAVR Studio 5.0VsAvrGCC.targets" from project "C:Dokumente und EinstellungentomEigene DateienAVRStudiotestAVRGCC2AVRGCC2AVRGCC2.avrgccproj" (target "ReBuild" depends on it):
    Task "RunAvrGCC"
        C:ProgrammeAtmelAVR Studio 5.0AVR ToolChainbinmake.exe clean all 
        In file included from .././AVRGCC2.cpp:1:0:
c:programmeatmelavr studio 5.0avr toolchainbin../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:ProgrammeAtmelAVR Studio 5.0VsAvr.common.targets" from project "C:Dokumente und EinstellungentomEigene DateienAVRStudiotestAVRGCC2AVRGCC2AVRGCC2.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 ==========

сравнение обоих выходов показывает, что для C-кода он добавляет опцию -mmcu=atmega328p в avr-gcc.exe но для C++-кода это не так при выполнении avr-g++.exe. Аналогичная проблема у меня при использовании WinAVR. Как это решить?