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Re: [avr-libc-dev] Deprecation policy [was: Re: [RFC][PATCH] Deprecate
From: |
Dmitry K. |
Subject: |
Re: [avr-libc-dev] Deprecation policy [was: Re: [RFC][PATCH] Deprecate inb / outb.] |
Date: |
Mon, 16 Jun 2003 13:22:14 +1100 |
User-agent: |
KMail/1.5 |
16 Jun 2003 11:45 Russell Shaw wrote:
> 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?
I shall specify, superfluous here only internal brackets. Removal
"do ... while" is undesirable, as, for example, it will be impossible to
write:
if (flag)
cbi_atomic(PORTB, 2); /* excess ';' */
else
==> parse error before "else"
- [avr-libc-dev] Deprecation policy [was: Re: [RFC][PATCH] Deprecate inb / outb.], eric, 2003/06/13
- Re: [avr-libc-dev] Deprecation policy [was: Re: [RFC][PATCH] Deprecate inb / outb.], Dmitry K., 2003/06/13
- Re: [avr-libc-dev] Deprecation policy [was: Re: [RFC][PATCH] Deprecate inb / outb.], Joerg Wunsch, 2003/06/14
- Re: [avr-libc-dev] Deprecation policy [was: Re: [RFC][PATCH] Deprecate inb / outb.], Dmitry K., 2003/06/15
- Re: [avr-libc-dev] Deprecation policy [was: Re: [RFC][PATCH] Deprecate inb / outb.], Joerg Wunsch, 2003/06/15
- Re: [avr-libc-dev] Deprecation policy [was: Re: [RFC][PATCH] Deprecate inb / outb.], Dmitry K., 2003/06/15
- Re: [avr-libc-dev] Deprecation policy [was: Re: [RFC][PATCH] Deprecate inb / outb.], Russell Shaw, 2003/06/15
- Re: [avr-libc-dev] Deprecation policy [was: Re: [RFC][PATCH] Deprecate inb / outb.], Dmitry K., 2003/06/15
- Re: [avr-libc-dev] Deprecation policy [was: Re: [RFC][PATCH] Deprecate inb / outb.],
Dmitry K. <=
- Re: [avr-libc-dev] Deprecation policy [was: Re: [RFC][PATCH] Deprecate inb / outb.], Russell Shaw, 2003/06/15
- Re: [avr-libc-dev] Deprecation policy [was: Re: [RFC][PATCH] Deprecate inb / outb.], Dmitry K., 2003/06/16
- Re: [avr-libc-dev] Deprecation policy [was: Re: [RFC][PATCH] Deprecate inb / outb.], Joerg Wunsch, 2003/06/18
- Re: [avr-libc-dev] Deprecation policy [was: Re: [RFC][PATCH] Deprecate inb / outb.], Dmitry K., 2003/06/18