[Mesa-dev] Can we use anonymous unions?

[Kenneth Graunke]

Hey,

I was thinking about using an anonymous union.  Specifically, something
like:

struct shader {
   ...
   union {
      struct geometry_shader_info gs;
      struct tess_eval_shader_info tes;
      ...
   };
};

Are those acceptable in Mesa?  I don't think we've traditionally used
them, but I'm not sure why.  Apparently they're part of C11, though not
part of C99.  However, GCC allows them, presumably Clang, and it looks
like MSVC 2005 supports them in C:

https://msdn.microsoft.com/en-us/library/y9zewe0d%28v=vs.80%29.aspx

We might be able to use these to avoid some of our fun
thing->base.Base.base.program.Base.base shenanigans...

--Ken
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