problem with fftw (probaly easy to solve)

problem with fftw (probaly easy to solve)

[Olivier Ricordeau]

Hi all!

	I'm making a little DSP program that uses the FFTW librariy to do 
Fourier's transforms. I've made a #include <rfftw.h> in my C source code 
and when I try to compile here is what I get:

-----------------------------------------------------------------------

[olivier@localhost c]$ gcc -Wall -ansi -o wav2tab wav2tab.c
/home/olivier/tmp/ccphPEIZ.o: In function `main':
/home/olivier/tmp/ccphPEIZ.o(.text+0x27): undefined reference to 
`rfftw_create_plan'
/home/olivier/tmp/ccphPEIZ.o(.text+0x8e): undefined reference to 
`rfftw_destroy_plan'
/home/olivier/tmp/ccphPEIZ.o(.text+0x158): undefined reference to 
`rfftw_one'
/home/olivier/tmp/ccphPEIZ.o(.text+0x26d): undefined reference to 
`rfftw_destroy_plan'
collect2: ld returned 1 exit status
[olivier@localhost c]$

-----------------------------------------------------------------------

Could someone help me with this problem? It looks like the answer is 
pretty simple but I don't have it :-)

-- 
|   -=Olivier RICORDEAU=-  |   It is rumored that someone once asked   |
|        Info Spé C2       |Dr. Bellman how to tell the exercises apart|
|     EPITA Promo 2005     |from the research problems, and he replied,|
|olivier.ricordeau@epita.fr| "If you can solve it, it is an exercise;  |
|       ICQ: 65452304      |    otherwise it's a research problem."    |
|   Phone: 06-86-72-08-52  | D.Knuth, "The Art Of Computer Programming"|

Re: problem with fftw (probaly easy to solve)

[Claudio Bley]

>>>>> "Olivier" == Olivier Ricordeau <olivier.ricordeau@wanadoo.fr> writes:

    Olivier> Hi all!  I'm making a little DSP program that uses the
    Olivier> FFTW librariy to do Fourier's transforms. I've made a
    Olivier> #include <rfftw.h> in my C source code and when I try to
    Olivier> compile here is what I get:

    Olivier> -----------------------------------------------------------------------

    Olivier> [olivier@localhost c]$ gcc -Wall -ansi -o wav2tab
[snip]
    Olivier> Could someone help me with this problem? It looks like
    Olivier> the answer is pretty simple but I don't have it :-)

You also need to link with the fftw library:

gcc -Wall -ansi -o wav2tab wav2tab.c -lfftw

Claudio

Re: problem with fftw (probaly easy to solve)

[Olivier Ricordeau]

Claudio Bley wrote:

>>>>>>"Olivier" == Olivier Ricordeau <olivier.ricordeau@wanadoo.fr> writes:
>>>>>>
> 
>     Olivier> Hi all!  I'm making a little DSP program that uses the
>     Olivier> FFTW librariy to do Fourier's transforms. I've made a
>     Olivier> #include <rfftw.h> in my C source code and when I try to
>     Olivier> compile here is what I get:
> 
>     Olivier> -----------------------------------------------------------------------
> 
>     Olivier> [olivier@localhost c]$ gcc -Wall -ansi -o wav2tab
> [snip]
>     Olivier> Could someone help me with this problem? It looks like
>     Olivier> the answer is pretty simple but I don't have it :-)
> 
> You also need to link with the fftw library:
> 
> gcc -Wall -ansi -o wav2tab wav2tab.c -lfftw
> 
> Claudio
> 
> 



It gives the same result... (now I use gcc 3)


[olivier@localhost c]$ gcc-3.0.1 -Wall -ansi -o wav2tab wav2tab.c -lfftw
/home/olivier/tmp/ccuQJWCn.o: In function `main':
/home/olivier/tmp/ccuQJWCn.o(.text+0x2a): undefined reference to 
`rfftw_create_plan'
/home/olivier/tmp/ccuQJWCn.o(.text+0x91): undefined reference to 
`rfftw_destroy_plan'
/home/olivier/tmp/ccuQJWCn.o(.text+0x15d): undefined reference to 
`rfftw_one'
/home/olivier/tmp/ccuQJWCn.o(.text+0x278): undefined reference to 
`rfftw_destroy_plan'
collect2: ld returned 1 exit status
[olivier@localhost c]$


-------------------------------------------------------------------

I've also tried with -lrfftw and it's worse:

[olivier@localhost c]$ gcc-3.0.1 -Wall -ansi -o wav2tab wav2tab.c -lrfftw
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/../../../librfftw.so: 
undefined reference to `fftw_die'
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/../../../librfftw.so: 
undefined reference to `fftw_make_node_hc2hc'
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/../../../librfftw.so: 
undefined reference to `fftw_make_node_hc2real'
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/../../../librfftw.so: 
undefined reference to `fftwnd_work_size'
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/../../../librfftw.so: 
undefined reference to `fftw_destroy_plan_internal'
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/../../../librfftw.so: 
undefined reference to `fftwnd_create_plans_specific'
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/../../../librfftw.so: 
undefined reference to `fftw_make_empty_table'
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/../../../librfftw.so: 
undefined reference to `fftw_make_plan'
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/../../../librfftw.so: 
undefined reference to `fftw_free'
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/../../../librfftw.so: 
undefined reference to `fftw_fprint_plan'
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/../../../librfftw.so: 
undefined reference to `fftw_factor'
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/../../../librfftw.so: 
undefined reference to `fftw_complete_twiddle'
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/../../../librfftw.so: 
undefined reference to `fftw_malloc'
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/../../../librfftw.so: 
undefined reference to `fftwnd_destroy_plan'
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/../../../librfftw.so: 
undefined reference to `fftwnd_create_plan_aux'
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/../../../librfftw.so: 
undefined reference to `fftw_estimate_node'
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/../../../librfftw.so: 
undefined reference to `fftw_lookup'
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/../../../librfftw.so: 
undefined reference to `fftw_gettimeofday_get_time'
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/../../../librfftw.so: 
undefined reference to `fftw_destroy_table'
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/../../../librfftw.so: 
undefined reference to `fftwnd_create_plans_generic'
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/../../../librfftw.so: 
undefined reference to `fftw_wisdom_lookup'
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/../../../librfftw.so: 
undefined reference to `fftw_make_node_real2hc'
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/../../../librfftw.so: 
undefined reference to `fftw_reverse_int_array'
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/../../../librfftw.so: 
undefined reference to `fftw_pick_better'
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/../../../librfftw.so: 
undefined reference to `fftwnd_new_plan_array'
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/../../../librfftw.so: 
undefined reference to `fftw_make_node_rgeneric'
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/../../../librfftw.so: 
undefined reference to `fftw_wisdom_add'
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/../../../librfftw.so: 
undefined reference to `fftwnd_fprint_plan'
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/../../../librfftw.so: 
undefined reference to `fftw_gettimeofday_time_diff'
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/../../../librfftw.so: 
undefined reference to `fftw_use_plan'
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/../../../librfftw.so: 
undefined reference to `fftw_insert'
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/../../../librfftw.so: 
undefined reference to `fftw'
collect2: ld returned 1 exit status
[olivier@localhost c]$


Please help I'm a beginner in C and next week I have to present this 
program to my teachers...

-- 
|   -=Olivier RICORDEAU=-  |   It is rumored that someone once asked   |
|        Info Spé C2       |Dr. Bellman how to tell the exercises apart|
|     EPITA Promo 2005     |from the research problems, and he replied,|
|olivier.ricordeau@epita.fr| "If you can solve it, it is an exercise;  |
|       ICQ: 65452304      |    otherwise it's a research problem."    |
|   Phone: 06-86-72-08-52  | D.Knuth, "The Art Of Computer Programming"|

Re: problem with fftw (probaly easy to solve)

[Olivier Ricordeau]

I found!!!!

Here's the right compilation comand!:
gcc -Wall -ansi -o wav2tab wav2tab.c -lrfftw -lfftw -lm

Thanks to those who have tried to find the solution

PS: :-) :-) :-)

-- 
|   -=Olivier RICORDEAU=-  |   It is rumored that someone once asked   |
|        Info Spé C2       |Dr. Bellman how to tell the exercises apart|
|     EPITA Promo 2005     |from the research problems, and he replied,|
|olivier.ricordeau@epita.fr| "If you can solve it, it is an exercise;  |
|       ICQ: 65452304      |    otherwise it's a research problem."    |
|   Phone: 06-86-72-08-52  | D.Knuth, "The Art Of Computer Programming"|

Re: problem with fftw (probaly easy to solve)

[Claudio Bley]

>>>>> "Olivier" == Olivier Ricordeau <olivier.ricordeau@wanadoo.fr> writes:

    >> gcc -Wall -ansi -o wav2tab wav2tab.c -lfftw
    >> 
    >> Claudio

    Olivier> It gives the same result... (now I use gcc 3)

    Olivier> ------------------------------------------------------------

    Olivier> I've also tried with -lrfftw and it's worse:

    Olivier> Please help I'm a beginner in C and next week I have to
    Olivier> present this program to my teachers...

Okay, I couldn't try this at home because I haven't installed the fftw
library. But I found this FAQ entry at http://www.fftw.org/faq/:

,----
| Question 3.7. My program does not link (on Unix).
| 
| Please use the exact order in which libraries are specified by the
| FFTW manual (e.g. -lrfftw -lfftw -lm). Also, note that the libraries
| must be listed after your program sources/objects. (The general rule
| is that if A uses B, then A must be listed before B in the link
| command.). For example, switching the order to -lfftw -lrfftw -lm will
| fail.
`----

Claudio