Ivan Wagner wrote:
> Hi all,
>
> I'm trying to compile a small program (IIR oscillator) and want to use
> atan, cos and sin functions including the math.h library. The compiler
> doesn't complain about not finding the math.h file, indeed he finds it.
>
> But:
>
> he@so:~/codec$ sh3-linux-gcc -I /usr/sh3-linux/include codec.c
> /tmp/ccUqutnQ.o: In function `main':
> /tmp/ccUqutnQ.o(.text+0x180): undefined reference to `atan'
> /tmp/ccUqutnQ.o(.text+0x19c): undefined reference to `cos'
> /tmp/ccUqutnQ.o(.text+0x1a0): undefined reference to `sin'
> collect2: ld returned 1 exit status
>
> What's wrong?
>
> Thank you.
>
> Ivan.
>

you need -lm in your build command line to tell the linker to use the
math library.

Oh yeah you're right... It's long time since I did this last time...



Thank you,

Ivan.



Tim Keck wrote:
> Ivan Wagner wrote:
> > Hi all,
> >
> > I'm trying to compile a small program (IIR oscillator) and want to use
> > atan, cos and sin functions including the math.h library. The compiler
> > doesn't complain about not finding the math.h file, indeed he finds it.
> >
> > But:
> >
> > he@so:~/codec$ sh3-linux-gcc -I /usr/sh3-linux/include codec.c
> > /tmp/ccUqutnQ.o: In function `main':
> > /tmp/ccUqutnQ.o(.text+0x180): undefined reference to `atan'
> > /tmp/ccUqutnQ.o(.text+0x19c): undefined reference to `cos'
> > /tmp/ccUqutnQ.o(.text+0x1a0): undefined reference to `sin'
> > collect2: ld returned 1 exit status
> >
> > What's wrong?
> >
> > Thank you.
> >
> > Ivan.
> >
>
> you need -lm in your build command line to tell the linker to use the
> math library.