[lug] OT: cc question

[Chan Kar Heng]

I'm answering this offhand... try this instead:

cc simple.c -lm

At 2003-12-03 04:58 PM, you wrote:
>If I enter the following simple program
>
>#include <math.h>
>#include <stdio.h>
>
>int main()
>{
>       double results;
>
>       results=sqrt(4);
>       printf ("%f\n", results);
>
>       return 0;
>}
>
>and compile it with the following on the command line
>
>cc simple.c
>
>I get the following error
>
>/tmp/cc40XqaS.o(.text+0x1b): In function `main':
>: undefined reference to `sqrt'
>collect2: ld returned 1 exit status
>
>If I then use the following command to compile it, it works correctly.
>cc simple.c -O2
>
>This is true on debian and slackware. Does anyone know of an explaination?