RE: [avr-libc-dev] bug in rand()/random()/do_rand()/do_random( )

[Mikal Hart]

Thanks much for the quick replies, Joerg and Eric,

Not being a Linux user myself, I forwarded your follow up questions to the
original thread and got some replies (see
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1227218077/52#52).

The most informative reply came from "Veronica" who reports that she sees
the failure with this configuration:

Ubuntu 8.10 (Intrepid Ibex)
avr-libc 1:1.6.2-1
avr-gcc 1:4.3.0-2
Maintainer: Ubuntu MOTU Developers
Linux main 2.6.27-11-generic #1 SMP Fri Dec 19 16:29:35 UTC 2008 x86_64
GNU/Linux

but when she installs the following files from debian sid, it fixes the
problem:

binutils-avr_2.18-4_amd64.deb
avr-libc_1.6.2.cvs20080610-2_all.deb
gcc-avr_4.3.2-1_amd64.deb

Answering other specific points and questions:

Eric, I understand that you should ordinarily seed to get reasonable
randomness, but I intentionally avoided doing so in this case to better
compare the behaviors of the varying implementations of rand() and random()

Joerg, I agree that it is quite interesting that the very first number
supplied by (unseeded) random() is 0.

Does it seem like it's a problem with the 4.3.0 compiler?  Would you still
recommend I file a bug report at savannah.nongnu.org?

Regards,

Mikal

-----Original Message-----
From: address@hidden
[mailto:address@hidden On Behalf Of
Weddington, Eric
Sent: Saturday, January 03, 2009 5:41 PM
To: Joerg Wunsch; address@hidden
Subject: RE: [avr-libc-dev] bug in rand()/random()/do_rand()/do_random( )

 

> -----Original Message-----
> From: 
> address@hidden 
> [mailto:address@hidden
> org] On Behalf Of Joerg Wunsch
> Sent: Saturday, January 03, 2009 4:22 PM
> To: address@hidden
> Subject: Re: [avr-libc-dev] bug in 
> rand()/random()/do_rand()/do_random( )
> 
> As Mikal Hart wrote:
> 
> 
> That would also be an indication that the issue has been fixed long
> since, but the Ubuntu users are apparently using a way old version of
> avr-libc (probably since their package maintainer lags quite a couple
> of years behind).
> 

In the arduino forum thread, a user reported using Suse with avr-libc 1.6.1:
<http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1227218077/15>

So it's not a terribly old version.


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