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[bugs:#1185] configure.ac script changes for fftw3

Status: open
Group: v0.46
Created: Mon Jan 19, 2015 02:00 AM UTC by Anonymous
Last Updated: Mon Jan 19, 2015 02:00 AM UTC
Owner: nobody

This patch updates the configure.ac file to check the library for 32-bit floating point fftw3.

The function fftwf_execute occurs in pd and in fftw3 but not in fftw2. In the 64-bit version of fftw, the function occurs as "fftw_execute" instead.

So it's safe to check against, and precision specific. The autoconfigure test will write a short program declaring the function header:
char fftwf_execute();

and testing that the program links correctly with the fftw library

--- pd-0.45-4.orig/configure.ac 2013-11-22 10:43:24.000000000 -0600
+++ pd-0.45-4/configure.ac 2015-01-18 19:43:06.378612708 -0600
@@ -212,13 +212,13 @@
AM_CONDITIONAL(PORTMIDI, test x$portmidi = xyes)
if test x$portmidi = xyes; then echo Using included portmidi; fi

-dnl fftw v2
+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(fftw, fftw_one, [LIBS="$LIBS -lfftw"],
+ AC_CHECK_LIB(fftw3f, fftwf_execute, [LIBS="$LIBS -lfftw3f"],
[AC_MSG_NOTICE([fftw package not found - using built-in FFT]); fftw=no])
fi
AM_CONDITIONAL(FFTW, test x$fftw = xyes)

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