undefined reference help

**Joe Estock** · Dec 5 '05, 12:05 AM

Re: undefined reference help

none wrote:[color=blue]
> 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!
>[/color]
[snip newsfeeds.com appendage]

[OT]
link with -lmath
[/OT]

Joe

**Mark McIntyre** · Dec 5 '05, 12:15 AM

Re: undefined reference help

On Sun, 04 Dec 2005 18:49:39 -0500, in comp.lang.c , none <none@all>
wrote:[color=blue]
>
>i get 'undefined reference to cos'. it happens with any
>function in math.h.[/color]

This is a FAQ. Please read it.
--
Mark McIntyre
CLC FAQ <http://www.eskimo.com/~scs/C-faq/top.html>
CLC readme: <http://www.ungerhu.com/jxh/clc.welcome.txt >

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**Keith Thompson** · Dec 5 '05, 06:05 AM

Re: undefined reference help

Joe Estock <jestock@NOSPAM nutextonline.co m> writes:[color=blue]
> none wrote:[color=green]
>> 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.[/color][/color]
[...][color=blue]
> [OT]
> link with -lmath
> [/OT][/color]

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

--
Keith Thompson (The_Other_Keit h) kst-u@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <*> <http://users.sdsc.edu/~kst>
We must do something. This is something. Therefore, we must do this.

**Martin Ambuhl** · Dec 5 '05, 06:35 AM

Re: undefined reference help

none wrote:
[...][color=blue]
> i get 'undefined reference to cos'. it happens with any function in math.h.
>
> what to do?[/color]

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

**Joe Estock** · Dec 5 '05, 09:15 AM

Re: undefined reference help

Keith Thompson wrote:[color=blue]
> Joe Estock <jestock@NOSPAM nutextonline.co m> writes:
>[color=green]
>>none wrote:
>>[color=darkred]
>>>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.[/color][/color]
>
> [...]
>[color=green]
>>[OT]
>>link with -lmath
>>[/OT][/color]
>
>
> [OT]
> -lm, not -lmath.
> C FAQ 14.3 <http://www.eskimo.com/~scs/C-faq/faq.html>
> [/OT]
>[/color]

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

Joe

**none** · Dec 5 '05, 09:05 PM

Re: undefined reference help

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

Martin Ambuhl wrote:[color=blue]
> none wrote:
> [...]
>[color=green]
>> i get 'undefined reference to cos'. it happens with any function in
>> math.h.
>>
>> what to do?[/color]
>
>
> Here's how a civilized human being would do it: check the FAQ before
> posting questions. The answer is there.[/color]

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**Martin Ambuhl** · Dec 5 '05, 10:25 PM

Re: undefined reference help

none wrote:[color=blue]
> 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[/color]

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

**Keith Thompson** · Dec 5 '05, 10:55 PM

Re: undefined reference help

Martin Ambuhl <mambuhl@earthl ink.net> writes:[color=blue]
> none wrote:[color=green]
>> 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[/color]
>
> The biggest space wasters are the folks who post questions already
> answered in the FAQ. Buy a mirror.[/color]

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>

--
Keith Thompson (The_Other_Keit h) kst-u@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <*> <http://users.sdsc.edu/~kst>
We must do something. This is something. Therefore, we must do this.

**Mark McIntyre** · Dec 5 '05, 11:35 PM

Re: undefined reference help

On Mon, 05 Dec 2005 16:03:13 -0500, in comp.lang.c , none <none@all>
wrote:
[color=blue]
>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[/color]

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

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**Joe Wright** · Dec 6 '05, 02:55 AM

Re: undefined reference help

Mark McIntyre wrote:[color=blue]
> On Mon, 05 Dec 2005 16:03:13 -0500, in comp.lang.c , none <none@all>
> wrote:
>
>[color=green]
>>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[/color]
>
>
> You needed to search for "undefined" and then you'd have found several
> useful sections. Patience is important by the way.
>[/color]

Dear God. Please give me patience. Now!

--
Joe Wright
"Everything should be made as simple as possible, but not simpler."
--- Albert Einstein ---

**Richard Heathfield** · Dec 6 '05, 04:25 AM

Re: undefined reference help

Joe Wright said:[color=blue]
> Mark McIntyre wrote:[color=green]
>> You needed to search for "undefined" and then you'd have found several
>> useful sections. Patience is important by the way.[/color]
>
> Dear God. Please give me patience. Now![/color]

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

--
Richard Heathfield
"Usenet is a strange place" - dmr 29/7/1999

http://www.cpax.org.uk

email: rjh at above domain (but drop the www, obviously)

**Randy Howard** · Dec 6 '05, 07:05 AM

Re: undefined reference help

Richard Heathfield wrote
(in article
<dn3357$4nb$1@n wrdmz02.dmz.ncs .ea.ibs-infra.bt.com>):
[color=blue]
> Uh-oh. You know what happens when you ask God for more patience? He sends
> you more children.[/color]

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

--
Randy Howard (2reply remove FOOBAR)
"The power of accurate observation is called cynicism by those
who have not got it." - George Bernard Shaw

**Richard Bos** · Dec 6 '05, 08:15 AM

Re: undefined reference help

Richard Heathfield <invalid@invali d.invalid> wrote:
[color=blue]
> Joe Wright said:[color=green]
> > Mark McIntyre wrote:[color=darkred]
> >> You needed to search for "undefined" and then you'd have found several
> >> useful sections. Patience is important by the way.[/color]
> >
> > Dear God. Please give me patience. Now![/color]
>
> Uh-oh. You know what happens when you ask God for more patience? He sends
> you more children.[/color]

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

Richard

**Mark McIntyre** · Dec 6 '05, 09:25 AM

Re: undefined reference help

On Tue, 6 Dec 2005 04:13:27 +0000 (UTC), in comp.lang.c , Richard
Heathfield <invalid@invali d.invalid> wrote:
[color=blue]
>Uh-oh. You know what happens when you ask God for more patience? He sends
>you more children.[/color]

You mean, trial by ordeal...

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

gd&r

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undefined reference help

undefined reference help

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