[ITK-users] Undefined references to methods of template classes

[Francisco Lopez de la Franca]

Thanks to your previous answer the problem was solved, but another one has
come out. It occurs when linking to create the library. It gives an
undefined reference to itk::ExceptionObject::ExceptionObject... as you can
see below.
What it is strange to me is that before including explicit template
instantiation, I created the library without errors, and now that I include
that, I get this error.
I'll appreciate very much any help.

Linking CXX shared library libTFM_Features.dll
CMakeFiles\TFM_Features.dir/objects.a(TFM_Features.cpp.obj):TFM_Features.cpp:(.t
ext$_ZN3itk21MemoryAllocationErrorC1ERKSsjS2_S2_[_ZN3itk21MemoryAllocationErrorC
1ERKSsjS2_S2_]+0x35): undefined reference to
`itk::ExceptionObject::ExceptionObj
ect(std::string const&, unsigned int, std::string const&, std::string
const&)'
CMakeFiles\TFM_Features.dir/objects.a(TFM_Features.cpp.obj):TFM_Features.cpp:(.t
ext$_ZN3itk21MemoryAllocationErrorC1ERKSsjS2_S2_[_ZN3itk21MemoryAllocationErrorC
1ERKSsjS2_S2_]+0x40): undefined reference to `vtable for
itk::MemoryAllocationEr
ror'
C:/CV/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/4.8.2/../../../../x86_64-w64-min
gw32/bin/ld.exe:
CMakeFiles\TFM_Features.dir/objects.a(TFM_Features.cpp.obj): ba
d reloc address 0x40 in section
`.text$_ZN3itk21MemoryAllocationErrorC1ERKSsjS2_
S2_[_ZN3itk21MemoryAllocationErrorC1ERKSsjS2_S2_]'
collect2.exe: error: ld returned 1 exit status
SRC\CMakeFiles\TFM_Features.dir\build.make:219: recipe for target
'SRC/libTFM_Fe
atures.dll' failed
mingw32-make[2]: *** [SRC/libTFM_Features.dll] Error 1
CMakeFiles\Makefile2:77: recipe for target
'SRC/CMakeFiles/TFM_Features.dir/all'
 failed
mingw32-make[1]: *** [SRC/CMakeFiles/TFM_Features.dir/all] Error 2
Makefile:74: recipe for target 'all' failed
mingw32-make: *** [all] Error 2

2015-01-09 21:02 GMT+01:00 Matt McCormick <matt.mccormick at kitware.com>:

> Hi Francisco,
>
> In order for the templates to be available in the library, they must
> be explicitly instantiated [1].
>
> HTH,
> Matt
>
> [1] http://www.cplusplus.com/articles/1C75fSEw/
>
> On Fri, Jan 9, 2015 at 2:59 PM, Francisco Lopez de la Franca
> <franciscolopezdelafranca at gmail.com> wrote:
> > Hi.
> > I' like to create a library containing, for example, one template class
> with
> > a number of methods.
> > I've programmed a simple example and the compilation and generation of
> the
> > library goes fine. I use the cmake "add_library" command for generating
> the
> > library.
> >
> > The problem arises at the moment of testing the library. I get an
> undefined
> > reference for every method in the template class.
> >
> > I've downloaded a tool to look in the contents (functions) of dynamic
> > libraries, and there is no function in the library. If I add another
> class
> > (not a template class), then, this tool shows me only the functions in
> this
> > latter class.
> >
> > Has anyone ever come across with this problem?
> >
> > Thanks a lot in advance.
> > Regards
> > /Francisco
> >
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