I have code I had written under atmel studio 4 a few years ago (but never debugged) and have created a new project under atmel studio 7 and copied all the files into the solution (they are added to the solution). Problem is, these sources will not ever build using atmels assembler because its is lacking functionality that is absolutely required for this project. I therefore need to switch to the GNU tool-chain. When I go into my project properties and select the tool-chain tab the ONLY option is the avr assembler. That is literally the only item in the list.
Why is the GNU assembler not an option here? How do I enable it as an option?