[libvirt] [PATCH] libvirt-domain: Drop virDomainMigrateCheckNotLocal attribute
pkrempa at redhat.com
Tue Oct 13 11:17:12 UTC 2015
On Mon, Oct 12, 2015 at 17:19:18 +0200, Michal Privoznik wrote:
> On 12.10.2015 17:06, Laine Stump wrote:
> > On 10/12/2015 10:41 AM, Michal Privoznik wrote:
> > (I have a fairly low opinion of ATTRIBUTE_NONNULL - at first glance it
> > *appears* that it should be doing something to guarantee that passed
> > args are non-null, but instead it is really just a hint to the
> > compiler's optimizer (and to static checkers like coverity) that the
> > programmer *thinks* there are no instances of NULL being passed in this
> > argument. This can result in useful checks (at runtime and during a
> > coverity run) being skipped. I don't remember the details, but have a
> > vague memory of a bug I was having trouble tracking down, and it ended
> > up being due to an ATTRIBUTE_NONNULL placed on an arg that *wasn't*
> > always non-NULL.)
> Yes, that was my recollection too when writing the commit message, but
> was just too lazy to dig out the commit you're talking about.
> Nevertheless, ATTRIBUTE_NONNULL over an attribute will make compiler
> skip check for NULL, i.e. if (!var) reportError(); will be totally
> dropped during compilation.
That's the exact reason why ATTRIBUTE_NONNULL was macroed out as a no-op
if you don't do static analysis builds.
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