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undefined reference to `sin' [message #1853449]

Sat, 02 July 2022 16:30

Kurt Struevy

Messages: 45
Registered: May 2016

Member

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 16:31]

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

Sat, 02 July 2022 18:45

Tauno Voipio

Messages: 742
Registered: August 2014

Senior Member

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).

--

Tauno Voipio

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

Sun, 03 July 2022 09:46

Kurt Struevy

Messages: 45
Registered: May 2016

Member

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

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