To successfully compile GRASS on 64bit platforms, the required
FFTW2 library has to be compiled with -fPIC flag:#applies to FFTW2, not GRASS:
cd fftw-2.1.5/
CFLAGS="-fPIC" ./configure
make
make install
Now we (theoretically) can compile GRASS with TclTk 8.4, maybe someone
who knows how can help to bring FFTW into the modern era as well, i.e.
to use fftw3 not fftw2.
#ifdef 's to remain backwards compat with v.2 ?
Hamish
Hamish wrote:
> To successfully compile GRASS on 64bit platforms, the required
> FFTW2 library has to be compiled with -fPIC flag:
>
> #applies to FFTW2, not GRASS:
> cd fftw-2.1.5/
> CFLAGS="-fPIC" ./configure
> make
> make install
This is true on any platform if FFTW is a static library and the GRASS
libraries (specifically libgrass_gmath) are dynamic libraries. In
practice, the safest option is to always use -fPIC for both static and
shared libraries. Static libraries compiled without -fPIC can only be
used directly by executables, and not by shared libraries.
Now we (theoretically) can compile GRASS with TclTk 8.4, maybe someone
who knows how can help to bring FFTW into the modern era as well, i.e.
to use fftw3 not fftw2.#ifdef 's to remain backwards compat with v.2 ?
If we don't care about supporting FFTW 2.x, the changes to
lib/gmath/fft.c to use 3.x instead are trivial.
Supporting both 2.x and 3.x would be quite a bit more work due to the
necessary configure.in changes.
--
Glynn Clements <glynn@gclements.plus.com>
> #ifdef 's to remain backwards compat with v.2 ?
If we don't care about supporting FFTW 2.x, the changes to
lib/gmath/fft.c to use 3.x instead are trivial.Supporting both 2.x and 3.x would be quite a bit more work due to the
necessary configure.in changes.
To help decide that from the "is GRASS the only one still using v2?" angle,
here's an informal poll of the Debian packages that use fftw2 and fftw3
currently. (Debian/Stable; thus may be slightly out of date)
FFTW3 wins the `wc -l` test, package relevance is more subjective.
# reverse dependancy check:
$ apt-cache rdepends fftw2
fftw2
Reverse Depends:
|libgrass
|grass
|tela
sfftw2
|rezound
|rezound
|python2.4-scipy
|python2.3-scipy
|python2.2-scipy
|pdl
p4fftwgel2
|mpb-mpi
|mpb
|linwsjt
|libwvstreams4.0-fft
|libsndobj2
|libgrass
k7fftwgel2
k6fftwgel2
|grass
|gramofile
|grace6
|grace
|gmfsk
|glfer
galan
fftw-docs
fftw-dev
|extace
|cassbeam
Note GRASS is listed twice as it exists both in the main archive and in
the DebianGIS repository.
# single precision version of FFTW2
$ apt-cache rdepends sfftw2
sfftw2
Reverse Depends:
sfftw-dev
|paul
k6fftwgel2
k7fftwgel2
|glame
k6fftwgel2
k7fftwgel2
|ams
k6fftwgel2
k7fftwgel2
$ apt-cache rdepends fftw3
fftw3
Reverse Depends:
octave-gpc
zynaddsubfx
wstools
tessa-mpi
tessa
swh-plugins
snd-gtk-alsa
snd-gtk
octave2.1
octave-statdataml
octave-sp
octave-plplot
octave-forge
nip2
mffm-fftw1
mffm-fftw-dev
linpsk
libvips10
libvips-tools
libgnuradio-core0
labplot
jamin
imms
gwc
gr-audio-oss
gkrellmss
freqtweak
fftw3-doc
fftw3-dev
ctsim-pentium4
ctsim-athlon
ctsim
brutefir
ale
Hamish