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Re: [avr-gcc-list] Undefined reference - Why?
From: |
Bernt Hustad Hembre |
Subject: |
Re: [avr-gcc-list] Undefined reference - Why? |
Date: |
Sun, 4 Mar 2001 18:46:51 +0100 (CET) |
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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