Re: [avr-gcc-list] Confusing volatile behaviour with 4.6.2

[Georg-Johann Lay]

Andy Warner schrieb:

> Here is what the preprocessor produced for this code:
>
> $ avr-gcc -mmcu=atmega128 -Wall -O2 -g -E test.c
> ...
> void __vector_18 (void) __attribute__ ((signal,used,
> externally_visible)) ; void __vector_18 (void)
> {
>  unsigned char status = (*(volatile uint8_t *)((0x0B) + 0x20));
>  unsigned char data = (*(volatile uint8_t *)((0x0C) + 0x20));
>  volatile static int slot = (-2);
>
>  if (status & 0x10) {
>   if (slot == (-2)) {
>    slot++;
>   } else {
>    goto search;
>   }
>  } else {
>   if ((slot < (-1)) || (++slot > (512))) {
>    goto search;
>   }
> ...

You are kidding.  The preprocessor does not introcude ... for extra 
obfuscation ;-)

Johann