Re: [avr-gcc-list] math linking problem even with -lm

[E. Weddington]

Andrew McNabb wrote:

> I'm using the math library for the first time, but the compiler doesn't
> seem to like what I'm doing.  I was smart enough to put "-lm" in the
> linker flags, and I even added "-L/usr/avr/lib" just in case, but that
> still didn't help.  /usr/avr/lib/libm.a definitely exists, and it
> includes sin.o.  I'm sure I'm still doing something dumb.  Does anyone
> know what could be happening?  Thanks in advance.
>
> avr-gcc -mmcu=atmega8 -lm -L/usr/avr/lib  sound1.o   -o sound1
> sound1.o: In function `__vector_8':
> sound1.c:(.text+0xac): undefined reference to `sin'
> make: *** [sound1] Error 1
>
>  

Did you try using MFile to generate a makefile for your project?:
<http://www.sax.de/~joerg/mfile/>

If you're using WinAVR, then MFile comes with it. Or you can use the 
WinAVR Makefile Template and modify it for your project.

The WinAVR Makefile Template and the Makefile generated by MFile (which 
uses the WinAVR Makefile Template) automatically setup a lot of these 
things for you including stuff like the math library.

HTH
Eric