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In message <818684416.3383@tecton2.demon.co.uk> you write:
> Hi,
> 
> When compiling I can't get at maths functions in math.h
> My programs have all worked so far but now I'm trying to use the
> cos function and gcc reports undefined symbol 'cos' when it's linking.
> I know math.h is being included because I've used the PI definition.
> 
> Any ideas on how I can sort this out?

Hi Lyndon,
	You need to add "-lm" to your final link line to tell it to link with
the maths library, eg:
	gcc foo.C -o foo -lm

	math.h contains the declarations for these functions, but the
definitions are in libm.so  (Most of the other functions in standard headers
are in libc.so, which is linked in by default).

Hope this helps,
Rusty.
--
Rusty.Russell@adelaide.maptek.com.au           "Engineer? So you drive trains?"
Lies, damned lies, and out-of-date documentation.        #include <stddisclm.h>