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Re: [libvirt] [PATCH] libvirt, logging: cleanup VIR_DEBUG0() VIR_INFO0() VIR_WARN0() VIR_ERROR0()



On 05/09/2011 03:24 AM, Lai Jiangshan wrote:
> These VIR_XXXX0 APIs make us confused, use the non-0-suffix APIs instead.
> 
> How these coversions works? The magic is using ##.
> #define high_levle_api(fmt, ...) low_levle_api(fmt, ##__VA_ARGS__)
> When __VA_ARGS__ is empty, "##" will swallow the "," in "fmt," to avoid compile error.

##__VA_ARGS__ is a GNU extension; it does not work on all C99 compilers.

I'm worried that this is not portable.

-- 
Eric Blake   eblake redhat com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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