Re: [avr-gcc-list] How to reserve registers

[Georg-Johann Lay]

Omar Choudary schrieb:
> Any ideas how to force GCC into not using r2-r5 at all?

Have a look at the -ffixed compiler option. You can write

-ffixed-2 -ffixed-3 -ffixed-4 -ffixed-5

Notice, however, that this only affects code generated by the compiler 
and not pre-compiled library code from your installation like libgcc, 
avr-libc or whatever.