Re: [avr-libc-dev] Deprecation policy [was: Re: [RFC][PATCH] Deprecate inb / outb.]

[Russell Shaw]

Dmitry K. wrote:
> 16 Jun 2003 06:18 Joerg Wunsch wrote:
>
> > Basically, it's now no longer (easily) possible to use one
> > of the SFRs as the target of an inline asm statement anyway (see bug
> > ID #2233, we need to update our inline asm docs accordingly).
>
>
> Examples of SFRs usage:
>
> //#define _SFR_ASM_COMPAT  1    /* needed for second example only       */
>
> #include <avr/io.h>
>
> /* Examples of SFRs as the target of an inline asm statements.
>    For qualitative realization it is necessary to add check:
>         if (__builtin_constant_p((port)))
>  */
> #define cbi_atomic(port,bit)    do {                    \
...
> } while (0)

What is the do{...} while(0) for?