[ITK-dev] -fvisibility=hidden link warnings with GetMetaDataObjectTypeName()

[Isaiah Norton]

>
> It sorta reminds me of the 'dynamic_cast on Mac OSX' thread, is it related?


Yes. This is a symptom of the same issue: missing export annotations. Hans
emailed about the same warnings in April (the mailing list archive is
currently down so I can't provide a link, but I can find it in my gmail
folder for insight-dev with a search for "global weak symbol").

On Fri, Nov 25, 2016 at 3:47 PM, Sean McBride <sean at rogue-research.com>
wrote:

> Hi all,
>
> I'm trying to rebuild my app and all its C++ libraries with
> -fvisibility=hidden -fvisibility-inlines-hidden.  It all builds, but I get
> 3 very similar link warnings building my app; the first is:
>
> ld: warning: direct access in function 'itk::MetaDataObject<itk::Array<double>
> >::GetMetaDataObjectTypeName() const' from file 'libITKCommon.a(itkMetaDataObject.cxx.o)'
> to global weak symbol 'typeinfo for itk::Array<double>' from file
> 'MyOwnCode.o' means the weak symbol cannot be overridden at runtime. This
> was likely caused by different translation units being compiled with
> different visibility settings.
>
> I'm using ITK 4.10.1 on OS X 10.11.6 with Xcode 7.3.1 (AppleClang 7.3).
>
> I'm hoping one of you C++ wizards could help me decipher the problem.  :)
> It sorta reminds me of the 'dynamic_cast on Mac OSX' thread, is it related?
>
> Thanks,
>
> --
> ____________________________________________________________
> Sean McBride, B. Eng                 sean at rogue-research.com
> Rogue Research                        www.rogue-research.com
> Mac Software Developer              Montréal, Québec, Canada
>
>
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