gcc do not find the library

[Sigmund Skjelnes]

Tried to compile this little program:
/* sqrt-number.c */

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

int main( int argc, char **argv ){

double f = 9.0;
printf("Kvadratroten av %f er %f\n", f, sqrt(f) );
}

Got this result:
sigmund@sigmund-desktop:~/csrc$ gcc -lm -o sqrt-number sqrt-number.c
/tmp/ccb750CF.o: In function `main':
sqrt-number.c:(.text+0x2f): undefined reference to `sqrt'
collect2: ld returned 1 exit status

Thought maybe libm is missing, it shold be in the package ( for Ubuntu 12.04 ) libc6, and that package is installed.

Tried to find some file which has the name libm.* and got /usr/lib/i386-linux-gnu/libm.so Then I'd tried to set the path to where gcc finds the libraries:

gcc -L/usr/lib/i386-linux-gnu -lm -o sqrt-number sqrt-number.c
again, undefined reference to 'sqrt'

Read somewhere that libraries that neeeded to be linked to the program need only to be listed in the arguments to gcc:
sigmund@sigmund-desktop:~/csrc$ gcc -o sqrt-number /usr/lib/i386-linux-gnu/libm.so sqrt-number.c
/tmp/ccLOlOSu.o: In function `main':
sqrt-number.c:(.text+0x2f): undefined reference to `sqrt'
collect2: ld returned 1 exit status

Obviously gcc cannot find the library, what am I doing wrong here?

Cincerely, Sigmund

[FÖLDY Lajos]

Move -lm to the end. And Google gcc libraries link order.

regards,
Lajos

[Sigmund Skjelnes]

-lm as the last argument to gcc did it. Thanks.