Did you check their documentation, or use a Microsoft tool such as dumpbin, to see whether the 32-bit library uses an obsolete ABI such as Compaq Fortran or VC6 compatible? Do you have the 32-bit library on PATH? Current Intel compilers include a compiled FFTW which is compatible with current conventions.
Could you please explain me how to check whether the 32-bit library uses an obsolet API?
The path should be configured correctly, I have two different folders for the 32-bit and 64-bit libraries, and I set the correct one in both projects.
The reason why I don't use the MKL routines for FFTW is because I was not able to make them work, do you know if there is some example code out there with Fortran calling these routines?
Thank you,
Alessandro