error LNK2019 when trying to use C++ program of CurveLab-2.1.3

Hello everyone,

I am working with CurveLab2.1.3 downloaded from this website and I am trying now to generate 'mexw64' file using mex command in Matlab,

I've got this link error after running this command:

mex -largeArrayDims fdct3d_forward_mex.cpp -llibfftw3-3 -llibfftw3f-3 -llibfftw3l-3 -L"C:\fftw-3.3.4-dll64" libfdct3d.a libfftw.a

   Création de la bibliothèque C:\Users\mariam\AppData\Local\Temp\mex_pfrp1Y\templib.x et de l'objet C:\Users\mariam\AppData\Local\Temp\mex_pfrp1Y\templib.exp 
fdct3d_forward_mex.obj : error LNK2019: symbole externe non résolu "int __cdecl fdct3d_forward(int,int,int,int,int,int,class NumTns<class std::complex<double> > &,class std::vector<class std::vector<class NumTns<class std::complex<double> >,class std::allocator<class NumTns<class std::complex<double> > > >,class std::allocator<class std::vector<class NumTns<class std::complex<double> >,class std::allocator<class NumTns<class std::complex<double> > > > > > &)" (?fdct3d_forward@@YAHHHHHHHAEAV?$NumTns@V?$complex@N@std@@@@AEAV?$vector@V?$vector@V?$NumTns@V?$complex@N@std@@@@V?$allocator@V?$NumTns@V?$complex@N@std@@@@@std@@@std@@V?$allocator@V?$vector@V?$NumTns@V?$complex@N@std@@@@V?$allocator@V?$NumTns@V?$complex@N@std@@@@@std@@@std@@@2@@std@@@Z) référencé dans la fonction mexFunction 
fdct3d_forward_mex.mexw64 : fatal error LNK1120: 1 externes non résolus 

C:\PROGRA~1\MATLAB\R2013A\BIN\MEX.PL: Error: Link of 'fdct3d_forward_mex.mexw64' failed.

Error using mex (line 206) Unable to complete successfully.

I would appreciate your help Thank you in advance

[Geoff Hayes]

Mariem - the error message is telling you that it can't find the definition for the function with the signature

 fdct3d_forward(int,int,int,int,int,int,class NumTns<class std::complex<double> > &,class std::vector<class std::vector<class NumTns<class std::complex<double> >,class std::allocator<class NumTns<class std::complex<double> > > >,class std::allocator<class std::vector<class NumTns<class std::complex<double> >,class std::allocator<class NumTns<class std::complex<double> > > > > > &)

which is being called in the fdct3d_forward_mex function. Did the download of this toolbox come with other libraries that you need to include in your MEX build? Did you call make lib to build supporting (?) libraries before building the MEX functions with make matab (that is how you are trying to build the MEX function, correct?).

[Mariem ZAOUALI]

Thank you Geoff for your answer.

I've successfully run make lib and this message was shown after I launched make matlab.

[Geoff Hayes]

Is there an h file that has the signature for fdct3d_forward? Have you tried contacting the authors of the code?

[Mariem ZAOUALI]

This file uses fdct3d.h. And for emailing the authors, not yet, I thought it was a simple problem .. Thank you again Geoff for your kindness and help

[Walter Roberson]

With respect to compiling Curvelab, see also http://uk.mathworks.com/matlabcentral/answers/263252-how-to-use-mex-files-in-matlab#comment_334471 -- you might need to expand the comments to see it.

Answer 1

[Mariem ZAOUALI]

I am writing this time to notify that I found a solution to this problem and this is thanks to you Geoff.

I was using Matlab on Windows. I moved on Ubuntu, I compiled my FFTW using

      ./configure --disable-shared
      make
      make install

then, I turned to Curvelab project under matlab, and I ran make and make matlab . and my program is successfully running!

Best regards

Answer 2

[Geoff Hayes]

Mariem - I think that the problem has to do with the libfdct3d.a. The command that was used to generate the same MEX file on my computer (R2014a, OS X 10.8.5) is

 mex fdct3d_forward_mex.cpp -I/Users/geoff/Development/fftw-2.1.5/fftw libfftw.a libfdct3d.a

which is a much simplified version of the command that your built script (via make matlab) is running (I'm not sure why, but probably has to do with the OS and/or MATLAB version).

Now, if I re-run the command without the libfdct3d.a as

 mex fdct3d_forward_mex.cpp -I/Users/geoff/Development/fftw-2.1.5/fftw libfftw.a

I observe an error similar to yours

 Undefined symbols for architecture x86_64:
  "fdct3d_forward(int, int, int, int, int, int, NumTns<std::complex<double> >&, std::vector<std::vector<NumTns<std::complex<double> >, std::allocator<NumTns<std::complex<double> > > >, std::allocator<std::vector<NumTns<std::complex<double> >, std::allocator<NumTns<std::complex<double> > > > > >&)", referenced from:
      _mexFunction in fdct3d_forward_mex.o
ld: symbol(s) not found for architecture x86_64

Can you verify that the libfdct3d.a library has been created? A copy of it should be in the ../CurveLab-2.1.3/fdct3d/src folder.