Re: [Xen-devel] Re: [PATCH] Fix __XEN_INTERFACE_VERSION__ old config breakage

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 7 Apr 2006, at 10:10, Magnus Damm wrote:

> I'm afraid that I know too little about xen to say something about how
> multiple interface versions are supposed to work, but I think your
> plan of failing instead of building an inconsistent kernel sounds
> good.
>
> My main concern was that the code didn't build with my old config
> file, and the error message produced by the c-compiler was far from
> user friendly. If the kernel build should fail then I would prefer
> some see some kind of #error message.
>
> Thanks!
Yes, that would be nice and preferably generated from within 
xen-compat.h so the check is not specific to Linux. But I'm not sure 
whether it's possible to detect an empty macro definition from CPP?
 -- Keir


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