[brlcad-tracker] [Google Code-in 2012] New comment on Research offset macro consolidation

[<no-...@go...>]

Hi,


Sean has left the following comment at Research offset macro consolidation  
http://www.google-melange.com/gci/task/view/google/gci2012/8172202:


not quite


Conveniently, Leffler in that reply thread provides the exact language from  
one of the standards (presumably C89, but possibly C99). Your example would  
only be valid if that's the offset to the structure member. The standard  
does say what, just not how.

All that means is that our code can finally start to make some assumptions  
(if it's C89). Our implementation far predates standardization and all of  
the issues I'm aware of were on pre-C89 K&R compilers that did some really  
wonky things.

Yes, we should see breakage -- hard runtime crashes -- for a compiler that  
doesn't actually provide a sane offset value. All the more reason to close  
out this research and take steps towards simplifying code.


Greetings,
The Google Open Source Programs Team


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