undefined reference help

[none]

i have:

#include <math.h>

int main (void)
{
double i = 0.0;
double v = 0.0;

i = cos(v);

return 0;
}


i get 'undefined reference to cos'. it happens with any
function in math.h.

what to do?

btw using rh 8.0 3.2-7 gcc version 3.2

please & thanks!

 

[Joe Estock]

i have:

#include <math.h>

int main (void)
{
double i = 0.0;
double v = 0.0;

i = cos(v);

return 0;
}


i get 'undefined reference to cos'. it happens with any function in math.h.

what to do?

btw using rh 8.0 3.2-7 gcc version 3.2

please & thanks!

[snip newsfeeds.com appendage]

[OT]
link with -lmath
[/OT]

Joe

 

[Mark McIntyre]

i get 'undefined reference to cos'. it happens with any
function in math.h.

This is a FAQ. Please read it.

 

[Keith Thompson]

i have:
#include <math.h>
int main (void)
{
double i = 0.0;
double v = 0.0;
i = cos(v);
return 0;
}
i get 'undefined reference to cos'. it happens with any function in
math.h.

[...]
[OT]
link with -lmath
[/OT]

[OT]
-lm, not -lmath.
C FAQ 14.3 <http://www.eskimo.com/~scs/C-faq/faq.html>
[/OT]

 

[Martin Ambuhl]

none wrote:
[...]

i get 'undefined reference to cos'. it happens with any function in math.h.

what to do?

Here's how a civilized human being would do it: check the FAQ before
posting questions. The answer is there.

 

[Joe Estock]

i have:
#include <math.h>
int main (void)
{
double i = 0.0;
double v = 0.0;
i = cos(v);
return 0;
}
i get 'undefined reference to cos'. it happens with any function in
math.h.

[...]

[OT]
link with -lmath
[/OT]

[OT]
-lm, not -lmath.
C FAQ 14.3 <http://www.eskimo.com/~scs/C-faq/faq.html>
[/OT]

Thanks for the catch Keith. I've been up far too long and I'm running
low on coffee.

Joe

 

[none]

i can take one, but i'll answer this one, i did check the
faq. i clicked on 'all questions' & searched for 'undefined
reference'. i didn't get any hits. thanks to all esp. joe
who got me on the right track. so can't we all get along &
stop wasting space here? ty

none wrote:
[...]

i get 'undefined reference to cos'. it happens with any function in
math.h.

what to do?

Here's how a civilized human being would do it: check the FAQ before
posting questions. The answer is there.

 

[Martin Ambuhl]

i can take one, but i'll answer this one, i did check the faq. i clicked
on 'all questions' & searched for 'undefined reference'. i didn't get
any hits. thanks to all esp. joe who got me on the right track. so
can't we all get along & stop wasting space here? ty

The biggest space wasters are the folks who post questions already
answered in the FAQ. Buy a mirror.

 

[Keith Thompson]

The biggest space wasters are the folks who post questions already
answered in the FAQ. Buy a mirror.

In the OP's defense, that particular FAQ can be difficult to find if
you don't already know what you're looking for. The question is

I'm trying to do some simple trig, and I am #including <math.h>,
but I keep getting ``undefined: sin'' compilation errors.

A search for "undefined" or "math.h" would have found it, but it's
understandable that someone could miss it. (It usually takes me a
couple of tries to find that one myself, and I already know the
answer.)

I suggest that the only response needed for the original question was

C FAQ 14.3 <http://www.eskimo.com/~scs/C-faq/faq.html>

 

[Mark McIntyre]

i can take one, but i'll answer this one, i did check the
faq. i clicked on 'all questions' & searched for 'undefined
reference'. i didn't get any hits

You needed to search for "undefined" and then you'd have found several
useful sections. Patience is important by the way.

 

[Joe Wright]

You needed to search for "undefined" and then you'd have found several
useful sections. Patience is important by the way.

Dear God. Please give me patience. Now!

 

[Richard Heathfield]

Joe Wright said:

Dear God. Please give me patience. Now!

Uh-oh. You know what happens when you ask God for more patience? He sends
you more children.

 

[Randy Howard]

Richard Heathfield wrote
(in article

Uh-oh. You know what happens when you ask God for more patience? He sends
you more children.

D O E S N O T C O M P U T E

 

[Richard Bos]

Joe Wright said:

Uh-oh. You know what happens when you ask God for more patience? He sends
you more children.

That's a good thing, surely? Unless you're out of Andalouse.

Richard

 

[Mark McIntyre]

Uh-oh. You know what happens when you ask God for more patience? He sends
you more children.

You mean, trial by ordeal...

anyway, to get children you need to fork, and thats offtopic here....

gd&r