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

[Lowekamp, Bradley (NIH/NLM/LHC) [C]]

Hello,

I presume you are compiling ITK with shared libraries?

Would you happen to have a minimal example of “MyOwnCode.cxx” that reproduces this warning?

Thanks,
Brad

> On 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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