C programming - undefined reference to `sqrt'

I am about to start work on mathematical software with Leap 15.1using C. I ran into the following (elementary?!) problem: Compilation of the following C-program test.c

include <stdio.h>

include <math.h>

int main()
{
double x = 4.0;
double y;

y = sqrt(x);
printf("Wurzel von %lf: %lf\n", x, y);

return;
}
using command "gcc -ansi -pedantic test.c -o test.exe" results in the error message
"/usr/lib64/gcc/x86_64-suse-linux/7/../../../../x86_64-suse-linux/bin/ld: /tmp/ccGo2pR5.o: in function main': test.c:(.text+0x23): undefined reference tosqrt'
collect2: error: ld returned 1 exit status
fjp@Tuxedo:~/ExponentialApproximation/EXPFJP/Programm>"
What can I do to correct this situation? The issue seems to the header file math.h.
My Leap 15.1 installation was done with yast2
Thanks in advance!

Franz Polster

Comments

  • malcolmlewismalcolmlewis Knowledge Partner
    edited August 18

    Hi and welcome to the Forum :)
    Unfortunately you have landed in the Enterprise forum rather than the openSUSE Community forum at https://forums.opensuse.org
    Since your here though, you have missed the linker flag (to math), compile with;

    gcc -ansi -pedantic test.c -o test.exe -lm
    
  • Thanks for the "-lm", everything works fine now!
    My intention was to join openSUSE Community, obviously I chose the wrong button at page de.opensuse.org/Portal:......., IMHO a confusing, not really helpful page. I will try (i.e. register) again using the link given in your response, thanks for that too!
    Franz Polster

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