On Wed, Jul 11, 2012 at 08:36:10AM -0600, Eric Blake wrote:
> On 07/11/2012 04:40 AM, Hu Tao wrote:
> > When building with --disable-debug, VIR_DEBUG expands to a nop.
> > But parameters to VIR_DEBUG can be variables that are passed only
> > to VIR_DEBUG. In the case the building system complains about unused
> > variables.
> > ---
> > cfg.mk | 2 ++
> > src/util/logging.h | 8 +++++++-
> > 2 files changed, 9 insertions(+), 1 deletion(-)
>
> > # else
> > +/**
> > + * virLogEatParam:
> > + *
> > + * Do nothing but eat parameters.
> > + */
> > +static inline void virLogEatParam(void *unused ATTRIBUTE_UNUSED, ...) {}
>
> Can't we do:
>
> static inline void virLogEatParam(void *dummy, ...) { dummy = dummy; }
>
> to avoid even needing the ATTRIBUTE_UNUSED, and the syntax check exemption?
Good.
>
> > # define VIR_DEBUG_INT(category, f, l, ...) \
> > - do { } while (0)
> > + virLogEatParam((void*)category, f, l, __VA_ARGS__)
>
> Any reason we have to use a cast, instead of just creating our eat
> function with the correct type parameter in the first place?
I just wanted to make the function more generic.
--
Thanks,
Hu Tao
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