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undefined reference to `sin' [message #1853449]

Sat, 02 July 2022 12:30

Eclipse User

Hello,
I think this is just a little problem:
I try to calculate a sinus value.
The relevant code is:

#include <math.h>
...
double angle, clearance;
....
clearance = sin(angle*M_PI/180.)*5.0;

here I get a linker error:
undefined reference to `sin'
What may be the problem?
Thanks a lot in advance.
Kurt

[Updated on: Sat, 02 July 2022 12:31] by Moderator

Re: undefined reference to `sin' [message #1853458 is a reply to message #1853449]

Sat, 02 July 2022 14:45

Eclipse User

You did tell the compiler how the sine function can be called, by including the header file.

Obviously you did not tell the linker to add the math library (-lm on linker command line).

Re: undefined reference to `sin' [message #1853463 is a reply to message #1853458]

Sun, 03 July 2022 05:46

Eclipse User

Hi Tauno Voipio,
thanks for your answer. IT was very helpful.
Now it works perfect.

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