[ITK-dev] Static link "error LNK2005: png_get_uint_31 already defined in png.lib", missing #define in itk_png_mangle.h?

[Matt McCormick]

Hi Niels,

Thanks for discussing the issue. Yes, the addition is a good
improvement that should address the issue. Could you please submit a
patch?:

  https://itk.org/Wiki/ITK/Git/Develop

Thanks,
Matt

On Tue, Apr 11, 2017 at 9:11 AM, Niels Dekker <niels-xtk at xs4all.nl> wrote:
> When trying build our project, which links statically to both ITK and the
> Niftyreg library, my colleague Floris Berendsen and I encountered the
> following link error:
>
>   >itkpng-4.10.lib(pngrutil.obj) : error LNK2005: png_get_uint_31 already
> defined in png.lib(pngrutil.obj)
> [...\SuperElastix-build\Testing\Unit\selxAnyFileIOTest.vcxproj]
>   >...\SuperElastix-build\bin\Debug\selxAnyFileIOTest.exe : fatal error
> LNK1169: one or more multiply defined symbols found
> [...\SuperElastix-build\Testing\Unit\selxAnyFileIOTest.vcxproj]
>
> It appears that ITK and Niftyreg link to different versions of libpng.
> Fortunately, ITK has done name mangling for most of the libpng API
> functions, to avoid such linking errors, as we can see at
> Modules/ThirdParty/PNG/src/itkpng/itk_png_mangle.h  Now it appears that the
> function "png_get_uint_31" is also exported by libpng, but that function is
> not mangled by ITK! We could locally fix our link error by adding an extra
> #define to "itk_png_mangle.h":
>
>     #define png_get_uint_31 itk_png_get_uint_31
>
> Do you guys agree that that would be an appropriate fix? Could such a fix be
> added to the ITK code base?
>
>   Kind regards, Niels
>
> PS Our project, SuperElastix, can be found at
> https://github.com/SuperElastix/SuperElastix  (We tried to build the
> SuperBuild from the development branch.) The Nifty Reg library is from
> https://cmiclab.cs.ucl.ac.uk/mmodat/niftyreg
>
> --
> Niels Dekker
> Scientific programmer
> LKEB, Leiden University Medical Center, Netherlands
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