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

From: Andreas Färber
Subject: Re: [Qemu-devel] [PATCH v4 4/8] Use libuuid if available.
Date: Mon, 1 Sep 2008 18:32:55 +0200

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:


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.)


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