Re: [avr-libc-dev] [bug #22878] eeprom_*_word/dword/block cause hang in ATmega256x

[Dmitry K.]

Hm...

Is avr-gcc for avr6 ready to use?

I have try avr-gcc 4.4-20080404 (4.3.0 does not support avr6)
with binutils 2.18.  In result the small program without any
EEPROM usage and without any inline functions gives incorrect
code:

/* avr-gcc 4.4-20080404 + binutils 2.18 produce incorrect code: the foo4()
   function stores 0 value to 'vp' variable.
   Options: -W -Wall -Os -mmcu=atmega2560
 */

#define BIGCODE()       asm volatile (".rept 30000\n\tnop\n\t.endr")

void (* volatile vp) (void);

__attribute__((noinline)) void foo1 (void)  { BIGCODE(); vp = foo1; }
__attribute__((noinline)) void foo2 (void)  { BIGCODE(); vp = foo2; }
__attribute__((noinline)) void foo3 (void)  { BIGCODE(); vp = foo3; }
__attribute__((noinline)) void foo4 (void)  { BIGCODE(); vp = foo4; }

int main ()
{
    foo1 ();
    foo2 ();
    foo3 ();
    foo4 ();
    return 0;
}


I will see the bug report later.

Dmitry.