[ITK] [ITK-users] Problems with writing filter using Xcode

Matt McCormick matt.mccormick at kitware.com
Fri Jul 3 07:22:24 EDT 2015 

Hi Vikash,

It depends on the content of your project files, but it does sound like it
was a templated class.  A templated class needs to be either defined in a
header or it needs to be explicitly instantiated over all the types it will
be used with in a .cxx file to avoid link errors.  ITK usually puts the
declaration in a .h files, then #include's the definition in a .hxx if
manual instantiation is not used [1].

HTH,
Matt

[1]
https://github.com/InsightSoftwareConsortium/ITK/blob/master/Modules/Core/Common/include/itkImage.h#L297-L299

On Fri, Jul 3, 2015 at 5:59 AM, Vikash Gupta <vikash.gupta at inria.fr> wrote:

> Hey Matt,
> Here is the extract from the CMakeLists.txt
>
> ADD_EXECUTABLE(testMapping testMapping.cxx)
>
> TARGET_LINK_LIBRARIES(testMapping ${ITK_LIBRARIES})
>
>
> And the  filter MapLR2HR is called from TestMapping.cxx. It used to work
> on a Linux system.
>
> Here is a stackexchange answer I found
>
>
>
> http://stackoverflow.com/questions/20230412/undefined-symbols-for-architecture-x86-64-shared-util-library-build-with-cmake
>
>
> So when I defined the function in the .h file itself the error
> disappeared. However, why this should happen for one particular function
> and not all the others. It should be consistent. So I am not able to figure
> that out.
>
>
> Thanks for all the help
>
>
> Vikash
>
>
>
> ------------------------------
>
> *From: *"Matt McCormick" <matt.mccormick at kitware.com>
> *To: *"Vikash Gupta" <vikash.gupta at inria.fr>
> *Cc: *"Sean McBride" <sean at rogue-research.com>, "insight-users at itk org" <
> insight-users at itk.org>
> *Sent: *Friday, July 3, 2015 2:41:49 AM
>
> *Subject: *Re: [ITK-users] Problems with writing filter using Xcode
>
> Hi Vikash,
>
> What does your CMakeLists.txt look like?  Are all executables created
> added in the CMakeLists.txt file with the add_executable and
> target_link_libraries command?
>
> Thanks,
> Matt
>
> On Fri, Jul 3, 2015 at 3:51 AM, Vikash Gupta <vikash.gupta at inria.fr>
> wrote:
>
>> Hey guys,
>> So, I moved to a different IDE (Eclipse). I am still getting similar
>> error.
>>
>> Here is the error
>>
>> Undefined symbols for architecture x86_64:
>>   "itk::MapLR2HRFilter<itk::Image<float, 3u>
>> >::SetTransform(itk::SmartPointer<itk::AffineTransform<double, 3u> >)",
>> referenced from:
>>       _main in testMapping.o
>> ld: symbol(s) not found for architecture x86_64
>> clang: error: linker command failed with exit code 1 (use -v to see
>> invocation)
>>
>> After some googling i figured its a problem with OS X. I wonder if anyone
>> knows how to fix it.
>>
>>
>> Thanks
>> Vikash
>>
>> ----- Original Message -----
>> > From: "Vikash Gupta" <vikash.gupta at inria.fr>
>> > To: "Sean McBride" <sean at rogue-research.com>
>> > Cc: "insight-users at itk org" <insight-users at itk.org>
>> > Sent: Thursday, July 2, 2015 1:19:21 PM
>> > Subject: Re: [ITK-users] Problems with writing filter using Xcode
>> >
>> > Ok I am updating it ...
>> >
>> > ----- Original Message -----
>> > > From: "Vikash Gupta" <vikash.gupta at inria.fr>
>> > > To: "Sean McBride" <sean at rogue-research.com>
>> > > Cc: "insight-users at itk org" <insight-users at itk.org>
>> > > Sent: Thursday, July 2, 2015 1:16:44 PM
>> > > Subject: Re: [ITK-users] Problems with writing filter using Xcode
>> > >
>> > > Or maybe I am doing something wrong.. Here is what I am doing step by
>> step
>> > >
>> > > 1. Build ITK as I would normally considering a UNIX machine
>> > > 2. Use a text editor to make the CMakeLists.txt and arrange my
>> directories
>> > > 3. use ccmake -GXcode to generate my xcode project
>> > > 4. Open the Xcode project and write the filters I need.
>> > >
>> > >
>> > > Vikash
>> > >
>> > > ----- Original Message -----
>> > > > From: "Vikash Gupta" <vikash.gupta at inria.fr>
>> > > > To: "Sean McBride" <sean at rogue-research.com>
>> > > > Cc: "insight-users at itk org" <insight-users at itk.org>
>> > > > Sent: Thursday, July 2, 2015 1:09:00 PM
>> > > > Subject: Re: [ITK-users] Problems with writing filter using Xcode
>> > > >
>> > > > Hi Sean,
>> > > > Yes I was using Xcode 6.xx But then I read on stackexchange that
>> there is
>> > > > some bug with the xcode 6.xx so rolled back to 5.xx . Also I was
>> > > > wondering
>> > > > if the .txx is a good extension for the counterpart to the .h file.
>> > > >
>> > > > Vikash
>> > > >
>> > > > ----- Original Message -----
>> > > > > From: "Sean McBride" <sean at rogue-research.com>
>> > > > > To: "Vikash Gupta" <vikash.gupta at inria.fr>, "insight-users at itk
>> org"
>> > > > > <insight-users at itk.org>
>> > > > > Sent: Thursday, July 2, 2015 1:05:04 PM
>> > > > > Subject: Re: [ITK-users] Problems with writing filter using Xcode
>> > > > >
>> > > > > On Thu, 2 Jul 2015 21:18:41 +0200, Vikash Gupta said:
>> > > > >
>> > > > > >I am using Mac OS X 10.10.3 and Xcode 5.1.1
>> > > > >
>> > > > > Maybe not the cause of your problem, but note that that's not a
>> valid
>> > > > > combination.  OS X 10.10.x requires Xcode 6.x (I forget exactly
>> which).
>> > > > >
>> > > > > 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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