Re: [avr-gcc-list] Optimization problems

[Joerg Wunsch]

"Tvrtko A. Ursulin" <address@hidden> wrote:

> I wrote a small kernel for a exercise. Mostly in C with small asm
> parts.  Everything works ok when compiled without -O, but with any
> -O tested (-Os, -O, -O2, -O9) it fails to store global variable back
> to RAM after manipulating it.

This is a FAQ, it's basically /the/ FAQ :), and therefore the very
first entry in the official avr-libc FAQ:

http://savannah.nongnu.org/download/avr-libc/doc/avr-libc-user-manual/FAQ.html

-- 
J"org Wunsch                                           Unix support engineer
address@hidden        http://www.interface-systems.de/~j/
avr-gcc-list at http://avr1.org