[Libvir] PATCH: make debug builds quiet by default

[Richard W.M. Jones]

Daniel P. Berrange wrote:
> How about this patch. I define VIR_DEBUG in src/internal.c. Each module
> which wants to output debug messages adds
> 
>   #define DEBUG(fmt,...) VIR_DEBUG("driver", fmt, __VA_ARGS__)
>   #define DEBUG0(msg) VIR_DEBUG("driver", "%s", msg)
> 
> Changing 'driver' to whatever their module name wants to be. All log
> messages get the function name included

+1, the patch looks fine to me.

> If we want to take this further to allow apps to turn it on/off via their
> own 'debug' flag instead of an env variable, then we need a logging API
> and a way for applications to register a callback to receive log messages.

I wouldn't bother making it too complicated.

Rich.

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