On Mon, Sep 30, 2013 at 7:45 PM, David Daney <[email protected]> wrote:
>> What about using __builtin_unreachable when we can but turn off warnings
>> and use do{}while(0) when __builtin_unreachable does not exist? This seems
>> the both worlds. Newer compilers produce better code with unreachable
>> anyways.
>>
>
> Simply not true.
>
> do{}while(0) is a NOP it is no more useful than an ';' statement. It
> doesn't serve as a magic uninitialized variable hiding mechanism.
You missed the "turn off warnings" part of the "and".
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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