Eric Blossom wrote:
On Thu, Sep 21, 2006 at 05:51:31PM -0500, Ron Shaffer wrote:
I'm trying to build with the latest svn source as of this past weekend
in FC 4. below is a snip of my configure and make outputs
... Can someone help me with this please - I'm getting unresolved
externals on FFTW -
..Ron
You don't have a version of FFTW installed that includes the single
precision versions.
The easiest way to fix it is to build fftw from source as described in
the README at the top of the gnuradio tree.
(3) FFTW 3.0 or later http://www.fftw.org
IMPORTANT!!! When building FFTW, you MUST use the --enable-single and
--enable-shared configure options. This builds the single precision
floating point version which we use. You should also use either the
--enable-3dnow or --enable-sse options if you're on an Athlon or Pentium
respectively.
The latter bits have a large impact on the speed so be sure and enable
the simd instruction codelets in FFTW. In fact, you can enable BOTH,
and FFTW will just do the right thing. I never trust that the default
included packages in the distro's have these flags turned on during the
compile. I always replace FFTW with my own compile from source in self
defense.
Eric
--
Robert W. McGwier, Ph.D.
Center for Communications Research
805 Bunn Drive
Princeton, NJ 08540
(609)-924-4600
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