Re: [Gumstix-users] Trigonometric functions in OE

[Bill G. <bg...@bi...>]

Jim F wrote:
> Hi,
> 
> I've been playing with the Gumstix OE implementation and have had good
> luck so far, compiling packages and my own code.  I am trying now to
> compute an FFT - so I need to be able to perform trigonometric functions
> such as sine and cosine - and I'm having trouble.  I've tried compiling
> using glibc and uclibc (where do I set USE_C99_MATH btw, not sure if
> that's right or not), and in both cases I get the following error:
> 
> | NOTE: make -e MAKEFLAGS=
> | arm-angstrom-linux-uclibcgnueabi-gcc -march=armv5te -mtune=xscale
> -L/home/friel/gumstix/gumstix-oe/tmp/staging/arm-angstrom-linux-uclibcgnueabi/lib
> -Wl,-rpath-link,/home/friel/gumstix/gumstix-oe/tmp/staging/arm-angstrom-linux-uclibcgnueabi/lib
> -Wl,-O1 fft_example.c fft.c print_to_file.c -o fft_example
> | /tmp/ccPh6qL8.o: In function `fft':
> | fft.c:(.text+0x2c8): undefined reference to `cos'
> | fft.c:(.text+0x300): undefined reference to `sin'
> | collect2: ld returned 1 exit status
> | make: *** [fft_example] Error 1
> | FATAL: oe_runmake failed

Try linking with -lm, it looks like you are missing libm.


b.g.
-- 
Bill Gatliff
bg...@bi...