undefined reference for sin, cos etc.

Bhagat R. (bhagats) OP 2010-09-20 09:32 #1863096

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Hi all !

I'm getting "undefined reference to sin" for a simple program:

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
int main ()
double a = 40.5;
double b = sin (a);
//printf("%f",b);
return 0;


The compiler is : arm-linux-gnueabi-gcc

Thanks in advance.

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Klaus W. (mfgkw) 2010-09-20 09:38 #1863102

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Perhaps the link option -lm helps?

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Bhagat R. (bhagats) OP 2010-09-20 18:42 #1863785

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Thanks a lot sir, It compiled straight away with that option. I was 
trying it for 2 days.

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alex Guest 2010-10-29 22:51 #1917114

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hello !
I have the same problem, but I have just started to program with C and I 
have not undestood your answer, insert -lm...

what I must do to compilate good my program ?

sorry for my bad english !!!

thank you

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Klaus W. (mfgkw) 2010-10-29 23:05 #1917131

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That depends on how you build your program (which IDE or a makefile?).