compiler problem???

hegdeshashi · 03-06-2007, 11:40 PM

Hi,

When I compiled my program,I am getting a strange error like..
============

gcc -o a a.c
---------------
a.c: In function ‘main’:
a.c:6: warning: incompatible implicit declaration of built-in function ‘printf’
/tmp/ccKpEN5H.o(.text+0x1b): In function `main':
: undefined reference to `sin'
collect2: ld returned 1 exit status
======================

can any one tell me solution...

rocket357 · 03-06-2007, 11:44 PM

Well, given that error, it would appear you're trying to overload the "printf" function. You should rename the function that's causing the problem.

hegdeshashi · 03-06-2007, 11:56 PM

here is my program
==============
#include<math.h>
#include<stdio.h>
main()
{

printf("%d\n",sin(2));
}
===================

output
================
gcc -o a a.c

/tmp/ccJvnKLV.o(.text+0x1b): In function `main':
: undefined reference to `sin'
collect2: ld returned 1 exit status
=====================

now,what is the problem????

rocket357 · 03-07-2007, 12:01 AM

You need to fully qualify sin(), I would think.

hegdeshashi · 03-07-2007, 12:12 AM

what do u mean...!!!!!!!!!!

My problem is on.....
collect2: ld returned 1 exit status

this,,,,
I mean .. linking problem..

I am having all header files ,but it is not able to link.

PerpetualNewbie · 03-07-2007, 04:29 PM

Just after doing a quickie Google search, I'd suggest trying the two following things:
1) Instead of using "sin(2)", declare a variable (such as double x) and assign 2.0 to it, then use the variable in the sin function like this:
double x = 2.0;
...
printf("%d\n", sin(x));

2) Link the math library using the command -lm
So your compile command would look like this:
gcc a.c -o a -lm

I really hope this helps, I'm really kind of a n00b programmer

Good luck!

hegdeshashi · 03-07-2007, 10:54 PM

Thx..PerpetualNewbie.

I got it...

Now ,one more problem,
When I run my shared memory programs,I am getting same linking error.

Is there any solution to overcome this linking?