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 Forum index » House Training » Users ( For the regulars )
problem with gcc compiler and math functions
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gemera

Joined: 17 Feb 2012
Posts: 14
PostPosted: Thu 04 Oct 2012, 12:59    Post subject:  problem with gcc compiler and math functions  
I've compiled tons of c programs in Puppy using Geany and the gcc compiler without any problems.

But for the first time I have used one of the math functions defined in the <math.h> header and get an error which I just can't solve.

Since I am learning c for both Windows and Linux I know the program works in the gcc compiler in Codeblocks for Windows.

Code:


#include <math.h>
#include <stdio.h>

int main(void)
{
      double x,y;

      x = 5;

      y = sqrt(x);

      return 0;
}



the error message is

Code:


/tmp/ccr0Yo3k.o: In function `main':
/root/test.c:11:undefined reference to `sqrt'
collect2: ld returned 1 exit status
make: ***[all] Error 1



btw I can use ANY of the math functions and get the same error.
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SFR


Joined: 26 Oct 2011
Posts: 1634
PostPosted: Thu 04 Oct 2012, 13:41    Post subject:  
Hey Gemera

Although I don't know C at all (high time to learn it at last...), but I think this will shed some light on the problem:
https://bbs.archlinux.org/viewtopic.php?id=47461

I've compiled your example with -lm and it seems to be ok...

Greetings!
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gemera

Joined: 17 Feb 2012
Posts: 14
PostPosted: Thu 04 Oct 2012, 14:13    Post subject:  
thanks for the heads up sdk.

really appreciated!
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Karl Godt


Joined: 20 Jun 2010
Posts: 4208
Location: Kiel,Germany
PostPosted: Thu 04 Oct 2012, 17:52    Post subject:  
This is with newer gcc i think . Had similar on Puppy Precise .
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