[petsc-users] How to build FFTW3 interface?

[Mark Adams]

On Thu, Apr 11, 2019 at 7:51 PM Sajid Ali via petsc-users <
petsc-users at mcs.anl.gov> wrote:

> Hi PETSc Developers,
>
> To run an example that involves the petsc-fftw interface, I loaded both
> petsc and fftw modules (linked of course to the same mpi) but the compiler
> complains of having no knowledge of functions like MatCreateVecsFFTW which
> happens to be defined at (in the source repo)
> petsc/src/mat/impls/fft/fftw.c. I don't see a corresponding definition in
> the install folder (I may be wrong, but i just did a simple grep to find
> the definition of the function I'm looking for and didn't find it while it
> was present in the header and example files).
>
> From previous threads on this list-serv I see that the developers asked
> users to use --download-fftw at configure time, but for users that already
> have an fftw installed, is there an option to ask petsc to build the
> interfaces as well (I didn't see any such option listed either here:
> https://www.mcs.anl.gov/petsc/documentation/installation.html or a
> variant in spack) ?
>

Your PETSc needs to be configured with something like --with-fftw-dir=/....
or --download-fftw


>
> Also, could the fftw version to download be bumped to 3.3.8 (here :
> petsc/config/BuildSystem/config/packages/fftw.py) since 3.3.7 gives
> erroneous results with gcc-8.
>
> Bug in fftw-3.3.7+gcc-8 :
> https://github.com/FFTW/fftw3/commit/19eeeca592f63413698f23dd02b9961f22581803
>
>
> Thank You,
> Sajid Ali
> Applied Physics
> Northwestern University
>
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