Re: [Qemu-devel] [PATCH v4 4/8] Use libuuid if available.

[Andreas Färber]

Am 01.09.2008 um 17:30 schrieb Jamie Lokier:

> Andreas Färber wrote:
> > > +static int generate_uuid;
> >
> > Does C99 ensure that generate_uuid gets initialized to zero? Afaik in
> > ANSI C it was undefined and needed an explicit assignment.
>
> This is wrong.
>
> In ANSI C (C89) and K&R before it, it is initialised to zero:
>
>   http://c-faq.com/decl/initval.html
>
> You might have seen compiler environments where the explicit
> assignment is needed.  They certainly exist, on some 'embedded' things
> like set-top boxes.  They are not standard C, but a useful variant.

Thanks to all of you for the answers. I wasn't aware there was a  
difference between global/static and non-static local variables in  
that aspect. The latter are not guaranteed to be initialized to zero,  
according to the link.

(Jamie: We had used MSP430 based sensor nodes in our C lecture back  
then.)

Andreas