From: Karthik Vishwanath <karthik@northstar.dartmouth.edu>
To: "Theo. Sean Schulze" <tschulze@teamfinders.org>
Cc: linux-c-programming@vger.kernel.org
Subject: Re: undefined sqrt()
Date: Thu, 24 Oct 2002 17:50:25 -0400 [thread overview]
Message-ID: <Pine.SGI.4.05.10210241744210.34469-100000@angstrom.dartmouth.edu> (raw)
In-Reply-To: <20021024205042.GA3766@teamfinders.org>
from the gcc man page:
"
... The linker handles an archive file by scan-
ning through it for members which define symbols
that have so far been referenced but not defined.
"
The funtion sqrt() is defined in the libm.a and declared in <math.h>. To
use the function, you need the "real code" (which is in libm.a). Thats the
way I think about it. I'll let the gurus on this list clarify, if anything
is misleading/ misrepresented here.
-K
On Thu, 24 Oct 2002, Theo. Sean Schulze wrote:
> Thanks. The "-lm" did it. Why? I see from the gcc man page that the
> "-l" is a linker option. Am I right that the linker then searches for
> "libm.a"? Again, why, if I am right, would it need to after I
> included math.h? Isn't sqrt() in math.h?
>
> Thanks,
> Sean
>
> On Thu, Oct 24, 2002 at 04:17:27PM -0400, Karthik Vishwanath hunted and pecked out:
> > Try:
> >
> > gcc -Wall -lm -o glide glide.c
> >
> > -K
> >
next prev parent reply other threads:[~2002-10-24 21:50 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-24 20:06 undefined sqrt() Theo. Sean Schulze
2002-10-24 20:17 ` Karthik Vishwanath
2002-10-24 20:50 ` Theo. Sean Schulze
2002-10-24 21:50 ` Karthik Vishwanath [this message]
2002-10-25 8:17 ` Glynn Clements
2002-10-25 17:27 ` Theo. Sean Schulze
2002-10-25 19:29 ` Glynn Clements
2002-10-24 20:28 ` Steven Smith
-- strict thread matches above, loose matches on Subject: below --
2002-10-26 10:07 Ruslan U. Zakirov
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