Re: [Qemu-devel] [RFC/RFA PATCH] qapi: detect extra members inside structs

[Paolo Bonzini]

Il 19/03/2012 20:34, Anthony Liguori ha scritto:
>>
>>     Is this acceptable or just wrong?
> 
> This is a feature.  The idea is that with QMP, old clients just ignore
> extra members in a structure.  I've never felt that comfortable with
> this as a semantic but this is how QMP was designed.

For old clients that could be fine.  But what about old servers? :)

Perhaps we need an argument to the QMPInputVisitor constructor to
control this.

> If you don't allow this semantic, then it's impossible to ever add a
> field to an existing type as that would break backwards compatibility.

Paolo