[PD-dev] fftw3 update to configure.am

Chris Clepper cgclepper at gmail.com
Sun Jan 18 21:15:19 CET 2015


fftw2 hasn't been updated since 1999!  I think it is safe to use fftw3
now...

On Sun, Jan 18, 2015 at 2:24 PM, Miller Puckette <msp at ucsd.edu> wrote:

> Hi Chuck -
>
> It looks like this would then no longer work with fftw2 - is this a
> problem, or is fftw3 widely enough distributed now that nobody will
> need fftw2 comatibility?
>
> thanks
> Miller
>
> On Sun, Jan 18, 2015 at 12:59:14PM -0600, Charles Z Henry wrote:
> > pd-0.45.4 has the right code for FFTW3 but has the wrong configure.ac
> > code to test for it.
> >
> > fftw_one is a function in FFTW2, which plans a 1D FFT.  The comparable
> > function in FFTW3 is fftw_plan_dft_1d
> >
> > To get this to configure properly, you only need to change the name of
> > the library and the function it looks for.  For the single precision
> > fftw3 library ( libfftw3f.so ) the function is named
> > sfftw_plan_dft_1d_ or sfftw_plan_dft_1d__
> >
> > Before filing a bug, I wanted to get another set of eyes on it.  Does
> > that function name look suspicious to anyone else?  I've confirmed the
> > symbol is the same in the system installed 3.3.3 version of the
> > library in ubuntu 14.04 and the custom compiled 3.3.4 version that I'm
> > using.
> >
> > To fix:
> >
> > This section of code in configure.ac:
> > dnl fftw v2
> > AC_ARG_ENABLE([fftw],
> >         [AS_HELP_STRING([--enable-fftw],
> >                 [use FFTW package])],
> >     [fftw=$enableval])
> > if test x$fftw = xyes; then
> >     AC_CHECK_LIB(fftw, fftw_one, [LIBS="$LIBS -lfftw"],
> >         [AC_MSG_NOTICE([fftw package not found - using built-in FFT]);
> fftw=no])
> > fi
> > AM_CONDITIONAL(FFTW, test x$fftw = xyes)
> >
> > becomes
> >
> > dnl fftw v3
> > AC_ARG_ENABLE([fftw],
> >         [AS_HELP_STRING([--enable-fftw],
> >                 [use FFTW package])],
> >     [fftw=$enableval])
> > if test x$fftw = xyes; then
> >     AC_CHECK_LIB(fftw3f, sfftw_plan_dft_1d_, [LIBS="$LIBS -lfftw3f"],
> >         [AC_MSG_NOTICE([fftw package not found - using built-in FFT]);
> fftw=no])
> > fi
> > AM_CONDITIONAL(FFTW, test x$fftw = xyes)
> >
> > Then, I run:
> > ./autogen.sh
> >
> > and
> >
> > ./configure --enable-jack --prefix=/home/chenry/pd-0.45.4
> > --enable-fftw CFLAGS=-I/home/chenry/linalg/include
> > LDFLAGS=-L/home/chenry/linalg/lib
> >
> > Chuck
> >
> > _______________________________________________
> > Pd-dev mailing list
> > Pd-dev at lists.iem.at
> > http://lists.puredata.info/listinfo/pd-dev
>
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