[LLVMdev] simulating c style unions in LLVM

[Andrew Lenharth]

On Tue, Jun 30, 2009 at 3:41 AM, Talin<viridia at gmail.com> wrote:
> Eli Friedman wrote:
>> On Tue, Jun 30, 2009 at 12:16 AM, Carter Cheng<carter_cheng at yahoo.com> wrote:
>>
>>> Since pointer sizes are platform dependent if I am trying to use the union in question with an extern C function is it possible to make write the single definition in a platform independent way?
>>>
>>
>> Not really; there's some discussion of that in the thread starting at
>> http://lists.cs.uiuc.edu/pipermail/llvmdev/2009-May/022132.html .
>>
> And it is something I still want to pursue, but last time I was unable
> to get a consensus on the implementation approach, so I put it off and
> worked on other things in the mean time.
>
> As far as the behavior and syntax, I think that's mostly settled - Chris
> suggested the struct syntax with a 'u' prefix, and I am fine with that.

Initial implementation discussions began with a patch I posted here:

http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20090511/077443.html

Andrew