Just because it was super-easy for me to fix:

https://github.com/apple/swift-corelibs-foundation/pull/587

That should allow C++ to be built if desired into CoreFoundation. However round 
tripping that into the Darwin version of CoreFoundation may be a bit cagey.

> On Aug 23, 2016, at 4:53 PM, Henry Betts <henry.be...@btconnect.com> wrote:
> 
> 
>> On 23 Aug 2016, at 16:58, Philippe Hausler <phaus...@apple.com> wrote:
>> 
>> Is there a specific version of ICU that we need to pick that functionality 
>> up? As it stands we don’t have a upper version limit on ICU but if we had a 
>> portion of the ICU source in CF it would probably mean that we would get 
>> symbolic conflicts when linking against versions that already had that.
> 
> 
> Looks like the C++ MeasureFormat (and friends) have existed since ICU 3.0, 
> although they have not yet got around to implementing a C interface. I don’t 
> think symbolic conflicts would occur, since, if ICU did eventually introduce 
> the C interface, I assume that it would use just a “u” prefix rather than 
> “ua”. Not sure if that’s what you meant.
> 
> Alternatively, I suppose we could just bypass uameasureformat, and interact 
> with the c++ api directly in CF, since it looks like it’s going to have to be 
> setup to compile c++ anyway.
> 
> Henry

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