AVR Freaks

I'm just getting started with avr32-gcc and AVR32 Studio. To obtain some examples of assembly language code I often ask my compilers to provide me with a listing. From \usr\local\bin I can run avr32-gcc with a -S switch to produce an assembler file, and I can run avr32-as with -ahls and stdout redirected to .lst to get the listings I require. That is all well and good but I'm having trouble with the standard include files like io.h. I've tried various combinations of -march= and -mpart= to no avail. There is an error cascade from the standard header files that goes on for quite a while with a main() that contains a just while(1); in it and no other references.