[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: C problem



Hi

Itamar S.-T. wrote:
> 
> Compiling the following example program:
> 	#include <math.h>
> 
> 	int main(void) {
>         	double x = sqrt(2.0);
>         	return 1;
> 	}
> 
> Gives me the following error:
> 	[itamar@porthos hashtest]$ gcc math.c 
> 	/tmp/cc1Mfpzc.o: In function `main':
> 	/tmp/cc1Mfpzc.o(.text+0xe): undefined reference to `sqrt'
> 	collect2: ld returned 1 exit status

You need to link it with libm, e.g.
gcc file.c -lm
(or better gcc -c file.c; gcc file.o -lm)

> 
> What is the problem here?  I'm getting such an error any time I try to use
> functions from math.h.  This is RH6 (glibc 2.1, egcs 1.1.2).

This is really an FAQ, look for any C book (or GCC FAQ, or whatever).

> 
> -- 
> Itamar - itamars@ibm.net
> 
> =================================================================
> To unsubscribe, send mail to linux-il-request@linux.org.il with
> the word "unsubscribe" in the message body, e.g., run the command
> echo unsubscribe | mail linux-il-request@linux.org.il
> 

	didi

=================================================================
To unsubscribe, send mail to linux-il-request@linux.org.il with
the word "unsubscribe" in the message body, e.g., run the command
echo unsubscribe | mail linux-il-request@linux.org.il