[SOLVED]noob: can't access math function

[arca]

Hi,
when i try to compile this code:

#include <math.h>

int main (void) {
double x, y;
x = 2;
y = sqrt(x);
return 0;
}

With the command:

$ gcc test.c

I got this message:

/tmp/cc5QZmCN.o: In function 'main':
test.c:(.text+0x16): undefined reference to 'sqrt'
collect2: error: ld returned 1 exit status

Any help?

I tried this on a fresh jessie install.
I have the same problem on wheezy.

Thanks in advance.

[aicardi]

There's lots of stuff on this.
Here's one http://linux.die.net/man/3/sqrt

Code: Select all

gcc -o test test.c -lm

I do think you will want build-essential installed.

[arca]

It works with the -lm option! Great.
Thank you very much, it was really frustrating.