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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