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

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

You are right! I am surprised CMake does not generate warning about that.

Thank you for the suggestion:
https://github.com/SimpleITK/SimpleITK/pull/76

Brad


> On Nov 29, 2016, at 10:04 AM, Johnson, Hans J <hans-johnson at uiowa.edu> wrote:
> 
> Brad,
> 
> Is that command line correct?  
> 
> :BOOL=hidden  ?   Is that true, or false, or should it be :STRING=hidden ?
> 
> Hans
> 
> 
> -- 
> 
> 
> On 11/29/16, 8:19 AM, "Insight-developers on behalf of Lowekamp, Bradley (NIH/NLM/LHC) [C]" <insight-developers-bounces at itk.org on behalf of blowekamp at mail.nih.gov> wrote:
> 
>    Thanks for the update, and the work to narrow your problem down.
> 
>    Just to let you know, another alternative to managing the flags is to use CMake preset property variables. When I build ITK for SimpleITK I apply (depending on the configuration) the following CMake options:
> 
>    -DCMAKE_C_VISIBILITY_PRESET:BOOL=hidden
>    -DCMAKE_CXX_VISIBILITY_PRESET:BOOL=hidden
>    -DCMAKE_VISIBILITY_INLINES_HIDDEN:BOOL=ON
> 
>    This seems to work well now. And CMake appears to append the option after on the programatic manipulation of the standard flag variables.
> 
>    HTH,
>    Brad
> 
>> On Nov 28, 2016, at 4:59 PM, Sean McBride <sean at rogue-research.com> wrote:
>> 
>> On Fri, 25 Nov 2016 20:55:31 +0000, Lowekamp, Bradley (NIH/NLM/LHC) [C] said:
>> 
>>> I presume you are compiling ITK with shared libraries?
>> 
>> No, as static libraries.
>> 
>>> Would you happen to have a minimal example of “MyOwnCode.cxx” that
>>> reproduces this warning?
>> 
>> I reduced it to a very small Xcode project with only 1 source file.  Then I continued to reduce it to just a command line invocation of clang and it stopped reproducing. :(
>> 
>> I soon discovered that between Xcode 6.4 and 7.0 a bug seems to have been introduced where turning on "symbols hidden by default" in the GUI (aka "GCC_SYMBOLS_PRIVATE_EXTERN = YES") doesn't actually pass "-fvisibility=hidden" to clang!
>> 
>> So, for my particular case at least, there is no ITK issue here.  Sorry for the noise.
>> 
>> Cheers,
>> 
>> -- 
>> ____________________________________________________________
>> 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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