Re: [avr-gcc-list] Undefined reference - Why?

[Bernt Hustad Hembre]

On Sun, 4 Mar 2001, it was written:

> > It compiles without any errormessages...
> What do you expect ? You are compiling with -O3. If you comment out
> a_function(hoyde) the optimzer recognices that hoyde and trykk are
> calculated but _never_ used. So they will be optimized out. Compile this
> withou any optimization and you get what you expected. You can also try
> "return hoyde" instead of "return 0". 

Ok. I can see why the errormessage dissapairs. But the interesting
question (for me anyway) is why do the errormessage appair in the first
place?

I use pow() like this:

hoyde = pow(2,2);

Whats wrong with this?

math.h defines pow:
extern double pow (double, double) __ATTR_CONST__;

Where do avr-gcc assume to find the objectfile where pow() is included?


Bernie
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