[llvm-commits] RFC: initial union syntax support

[Frits van Bommel]

Nick Lewycky wrote:
> Duncan Sands wrote:
>> another possibility is to not introduce new union types, but instead
>> to enhance the alloca instruction to take a list of types : it would
>> then allocate enough memory for all of the types in the list.  The
>> return type could be that of the first type in the list.
> 
> That's only good for stack variables. It doesn't work for globals.

Or unions that are struct members...