[ITK] [ITK-dev] FFTWForwardFFTImageFilter and FFTWInverseFFTImageFilter

[Bradley Lowekamp]

Hello,

One guess I have is that the Visual Studio version used to compile FFTW is different than the one you are using. This could cause linking problems due to the different versions. Just a guess though.

Brad

On Dec 9, 2014, at 2:01 PM, Tim Jackson <tj.jackson1226 at gmail.com> wrote:

> Hello,
> 
> I am currently writing a C++ program that I've called FTTC using VS2012 to compile.  I'm having problems including the FFTW libraries, which I downloaded v3.3.4 of the precompiled libraries for Windows, into ITK.  I reconfigured and rebuilt ITK v4.6.1, changing the variables in CMake to turn on ITK_USE_FFTWF and set the path for both FFTWF_LIB and FFTWF_THREADS_LIB to the downloaded version of libfftw3-3.lib.  I also set FFTW_INCLUDE_PATH to where all of the downloaded files for the FFTW are located.
> 
> ITK built without a problem, but when I now compile my program that uses the FFTWForwardFFTImageFilter and FFTWInverseFFTImageFilter, I get a whole host of linker error messages: 
> 
> fttc.obj : error LNK2019: unresolved external symbol __imp__fftwf_execute referenced in function "protected: virtual void __thiscall itk::FFTWInverseFFTImageFilter<class itk::Image<float,2>,class itk::Image<float,2> >::BeforeThreadedGenerateData(void)" (?BeforeThreadedGenerateData@?$FFTWInverseFFTImageFilter at V?$Image at M$01 at itk@@V12@@itk@@MAEXXZ)
> 
> fttc.obj : error LNK2019: unresolved external symbol __imp__fftwf_plan_dft_r2c referenced in function "public: static struct fftwf_plan_s * __cdecl itk::fftw::Proxy<float>::Plan_dft_r2c(int,int const *,float *,float (*)[2],unsigned int,int,bool)" (?Plan_dft_r2c@?$Proxy at M@fftw at itk@@SAPAUfftwf_plan_s@@HPBHPAMPAY01MIH_N at Z)
> 
> fttc.obj : error LNK2019: unresolved external symbol __imp__fftwf_plan_dft_c2r referenced in function "public: static struct fftwf_plan_s * __cdecl itk::fftw::Proxy<float>::Plan_dft_c2r(int,int const *,float (*)[2],float *,unsigned int,int,bool)" (?Plan_dft_c2r@?$Proxy at M@fftw at itk@@SAPAUfftwf_plan_s@@HPBHPAY01MPAMIH_N at Z)
> 
> fttc.obj : error LNK2019: unresolved external symbol __imp__fftwf_destroy_plan referenced in function "protected: virtual void __thiscall itk::FFTWInverseFFTImageFilter<class itk::Image<float,2>,class itk::Image<float,2> >::BeforeThreadedGenerateData(void)" (?BeforeThreadedGenerateData@?$FFTWInverseFFTImageFilter at V?$Image at M$01 at itk@@V12@@itk@@MAEXXZ)
> 
> fttc.obj : error LNK2019: unresolved external symbol __imp__fftwf_plan_with_nthreads referenced in function "public: static struct fftwf_plan_s * __cdecl itk::fftw::Proxy<float>::Plan_dft_c2r(int,int const *,float (*)[2],float *,unsigned int,int,bool)" (?Plan_dft_c2r@?$Proxy at M@fftw at itk@@SAPAUfftwf_plan_s@@HPBHPAY01MPAMIH_N at Z)
> 
> ITKFFT-4.6.lib(itkFFTWGlobalConfiguration.obj) : error LNK2019: unresolved external symbol __imp__fftwf_cleanup referenced in function "private: virtual __thiscall itk::FFTWGlobalConfiguration::~FFTWGlobalConfiguration(void)" (??1FFTWGlobalConfiguration at itk@@EAE at XZ)
> 
> ITKFFT-4.6.lib(itkFFTWGlobalConfiguration.obj) : error LNK2019: unresolved external symbol __imp__fftwf_init_threads referenced in function __catch$??0FFTWGlobalConfiguration at itk@@AAE at XZ$0
> 
> ITKFFT-4.6.lib(itkFFTWGlobalConfiguration.obj) : error LNK2019: unresolved external symbol __imp__fftwf_cleanup_threads referenced in function "private: virtual __thiscall itk::FFTWGlobalConfiguration::~FFTWGlobalConfiguration(void)" (??1FFTWGlobalConfiguration at itk@@EAE at XZ)
> 
> ITKFFT-4.6.lib(itkFFTWGlobalConfiguration.obj) : error LNK2019: unresolved external symbol __imp__fftwf_import_system_wisdom referenced in function __catch$??0FFTWGlobalConfiguration at itk@@AAE at XZ$0
> 
> ITKFFT-4.6.lib(itkFFTWGlobalConfiguration.obj) : error LNK2019: unresolved external symbol __imp__fftwf_import_wisdom_from_file referenced in function "public: static bool __cdecl itk::FFTWGlobalConfiguration::ExportWisdomFileFloat(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?ExportWisdomFileFloat at FFTWGlobalConfiguration@itk@@SA_NABV?$basic_string at DU?$char_traits at D@std@@V?$allocator at D@2@@std@@@Z)
> 
> C:\MIIA\FTTCBin\Release\FTTC.exe : fatal error LNK1120: 10 unresolved externals
> 
> 
> I've spent a long time searching the help forums and looked for ways to resolve this, but to no avail.  Does anyone know what I may be doing wrong?  I'm guessing I did something wrong when setting variables in CMake, but haven't been able to find any information on how to set them correctly.
> 
> Thanks for your time and assistance!
> 
> Best,
> Tim
> 
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