Chris Cason wrote:

> It would require the parser to track the deprecated
> status of each #declared item (passing up the state if a new declare
> inherits a deprecated declare, and so forth), which isn't as clean as
> I'd like it to be.

If the SDL could be changed to allow calling parameterless macros 
without parantheses, it might be possible to do something like

#declare I_Glass4_Deprecated =
     interior {
       ior 1.5
       fade_distance 2.0
       fade_power 1001
     }

#macro I_Glass4()
   #warning "I_Glass4 is deprecated"
   I_Glass4_Deprecated
#end

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