[PATCH] D28005: Add a unit field to DIGlobalVariable, mirroring the design of DISubprogram.

[Adrian Prantl via llvm-commits]

> On Dec 20, 2016, at 4:31 PM, Mehdi Amini <mehdi.amini at apple.com> wrote:
>> On Dec 20, 2016, at 4:30 PM, Adrian Prantl <aprantl at apple.com> wrote:
>>> On Dec 20, 2016, at 4:24 PM, David Blaikie <dblaikie at gmail.com> wrote:
>>> 
>>> Based on the discussion about DISubprogram deduplication for inline functions in (all flavors of) LTO - could we make this unit link null for non-external (well, specifically globals that can be duplicated - linkonce_odr and the like) & just emit those into whichever CU references them first?
>>> This would avoid redundant descriptions (where all but one lacks any location description, etc) of deduplicable globals. Though perhaps it's a non-issue for globals, since they aren't inlined - but they could be reduced to a constant which is sort of the same.
>>> 
>>> I can explain/provide examples if I'm being vague/hand-wavy.
>> 
>> How do I generate linkonce_odr global variable with clang? I would like to experiment with this a bit before I can answer your question.
> 
> Any template instantiation.

Can you give me an example? I understand how to generate a linkonce_odr *function*, but it's not obvious to me how to do generate a global variable.

-- adrian