For those interested in the solution, here's how to do it:
Open the project in Atmel Studio 6 Go to the solution explorer and right-click on the project. Select "Upload Project". Now the project should be grayed out. Right-click on the project and select "Modify."
You will see the xml code from the configuration and project settings.
50 o :
<Language>C</Language>
<ToolchainName>com.Atmel.AVRGCC32.C</ToolchainName>
, :
<Language>CPP</Language>
<ToolchainName>com.Atmel.AVRGCC32.CPP</ToolchainName>
.
, (CTRL + F7), Toolchain.
C ++.