Two problems. First, your link flags are in the wrong order (see Q3.12
in the FFTW FAQ). Second, you are calling functions from FFTW 2.x but
are linking FFTW 3.x, which has a different API.
Steven G. Johnson
Reply by ●March 27, 20062006-03-27
I have been trying to compile fftw on my linux computer but I get
fftw_complex in[N], out[N];
p = fftw_create_plan(N, FFTW_FORWARD, FFTW_ESTIMATE);
fftw_one(p, in, out);
> linux:~ # gcc -lfftw3 -o fft fft.c
> /tmp/ccz658bq.o(.text+0x7d): In function `main\':
> fft.c: undefined reference to `fftw_create_plan\'
> /tmp/ccz658bq.o(.text+0x90):fft.c: undefined reference to `fftw_one\'
> /tmp/ccz658bq.o(.text+0x9e):fft.c: undefined reference to
> collect2: ld returned 1 exit status
> My e-mail address is firstname.lastname@example.org
> The reason I wrote my e mail address is
> I don't know how to check reply on this forum.
> Thanks in anticipation.