BOUNCE rtl@rtlinux.org: Approval required: Non-member submissionfrom ["Jonas Persson" <jonas.persson@comsys.se>] (fwd)

[Der Herr Hofrat <der.herr@hofr.at>]

>From owner-rtl Mon May 28 01:37:13 2001
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From: "Jonas Persson" <jonas.persson@comsys.se>
To: <rtl@fsmlabs.com>
Subject: SV: [rtl] unresolved symbol __udivdi3 and __umoddi3
Date: Mon, 28 May 2001 09:29:51 +0200
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I have also had problems with __udivdi3. I got rid of the problem by typecasting to float, the math processor can do 64 bit division.

Regards,
Jonas

______________________________________________________________________
 Jonas Persson                    E-mail: jonas.persson@comsys.se
 Project Manager, M.Sc C.Sc&E     http://www.comsys.se/
 Comsys AB                        Phone: +46-(0)46-286 3051
 Forskningsbyn IDEON              Fax: +46-(0)46-286 3505
 S-223 70 Lund, Sweden


-----Ursprungligt meddelande-----
Fran: owner-rtl@fsmlabs.com [mailto:owner-rtl@fsmlabs.com]For Tony
Denault
Skickat: den 25 maj 2001 20:01
Till: rtl@fsmlabs.com
Amne: Re: [rtl] unresolved symbol __udivdi3 and __umoddi3




On Thu, 24 May 2001, Christopher D. Carothers wrote:

> 	Hi Havard --
>
> 	You need to link in the libgcc.a which is located at:
> /usr/lib/gcc-lib/i386-redhat-linux/egcs-2.91.66/libgcc.a
>
> > When I insert ahrs.o as a module (insmod ahrs.o) I get these errors:
> >
> > ahrs.o: unresolved symbol __udivdi3
> > ahrs.o: unresolved symbol __umoddi3
> >
> > I have no idea where the __udivdi3 and __umoddi3 are comming from and
> > what their purpose is. So any suggestions are welcome.

I had a similar problem but with __divdi3(). Linking in the libgcc.a
resolved the problem because the compiler is generating a reference to
this library.

I found out the __divdi3() is needed to do 64 bit division. Later I got
rid of my 64bit division, and didn't need to reference libgcc.a.
I suspect you are doing a divid & mod on a long long type.
Are you doing math on hrtime_t? hrtime_t is a long long.

To check, you can us the -S option in gcc to produce the assemble code
intermediate file. Then you can see were and why these function are needed
by the compiler.

Tony

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