How to install and configure FFTW-3.3.3 that can be compiled by "nios2-linux-gcc"

Hello,

I want to use fftw-3.3.3 in my nios2-uclinux , I install it follow "fftw installation user manual"：

(1)first, verify whether it works well on linux (centos-6.4)

[root@localhost fftw-3.3.3]# ./configure

[root@localhost fftw-3.3.3]# make

[root@localhost fftw-3.3.3]# make install

Edit the PATH:

export path=$path: /root/opt/nios2/bin:/usr/local/bin

export c_include_path=/usrlocal/include

export library_path=/usr/local/lib

After that, I write and compile a testfft.c:

[root@localhost root]# gcc testfft.c -lm -lfftw3 -i/usr/local/bin

[root@localhost root]# ./a.out

--the output is correct! it can work on my linux:).

(2) change to "nios2-linux-gcc"

[root@localhost root]# nios2-linux-gcc -v

--the version is 3.4.6, it's ok.

[root@localhost fftw-3.3.3]# make clean

--clean fftw pre-install

[root@localhost fftw-3.3.3]# ./configure cc="nios2-linux-gcc" --host=nios2

[root@localhost fftw-3.3.3]# make

[root@localhost fftw-3.3.3]# make install

........install........

then copy the "fftw3.f , fftw3.f03 , fftw3.h , fftw3l.f03 ,fftw3q.f03" from " /usr/local/include" folder to nios2 toolchain folder ".../nios2/include"

copy the the "fftw-wisedom, fftw-wisdom-to-conf" from "/usr/local/bin" to nios2 toolchain ".../nios2/bin"folder.

copy the "libfftw3.a, libfftw3.la" from "/usr/local/lib" to nios2 toolchain ".../nios2/lib"

(3) compile testfft.c again:

[root@localhost root]# nios2-linux-gcc testfft.c -lm -lfftw3 -i/usr/local/bin

/root/opt/nios2/bin/../lib/gcc/nios2-linux-uclibc/3.4.6/../../../../nios2-linux-uclibc/lib/libfftw3.a(mapflags.o)(.text+0x49c): in function `fftw_mapflags':

: undefined reference to `log'

/root/opt/nios2/bin/../lib/gcc/nios2-linux-uclibc/3.4.6/../../../../nios2-linux-uclibc/lib/libfftw3.a(mapflags.o)(.text+0x4b8): in function `fftw_mapflags':

: undefined reference to `log'

/root/opt/nios2/bin/../lib/gcc/nios2-linux-uclibc/3.4.6/../../../../nios2-linux-uclibc/lib/libfftw3.a(trig.o)(.text+0xf0): in function `real_cexp':

: undefined reference to `cos'

/root/opt/nios2/bin/../lib/gcc/nios2-linux-uclibc/3.4.6/../../../../nios2-linux-uclibc/lib/libfftw3.a(trig.o)(.text+0x10c): in function `real_cexp':

: undefined reference to `sin'

collect2: ld returned 1 exit status

--something is wrong, "nios2-linux-gcc" can't compile it .:confused:

the nios2-linux is "nios2-linux-20090929.tar"

the nios2gcc is "nios2gcc-20080203.tar.bz2"

--the nios2-linux is ok, i have verified it on my fpga hardware.

maybe the configuration is wrong, so would somebody give me some suggestions?

thank you very much!