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Re: [avr-gcc-list] clock skew detected

From: Jack Valmadre
Subject: Re: [avr-gcc-list] clock skew detected
Date: Tue, 30 Sep 2003 17:51:17 +1000

I'm using Windows XP, and I haven't seen this error on my old Windows 98
Should I just not worry about it, or could it be affecting my programs?

Also, for my application (RoboCup Junior soccer) I need to optimise my code
for speed, without having to worry much about space (32kB on the ATMega32).
Which optimisation setting should I specify in the makefile?


(sorry David if you get this twice)

----- Original Message ----- 
From: "David Brown" <address@hidden>
To: <address@hidden>
Sent: Tuesday, September 30, 2003 4:53 PM
Subject: Re: [avr-gcc-list] clock skew detected

> > On Tue, Sep 30, 2003 at 11:01:40AM +1000, Jack Valmadre wrote:
> > > I've just switched from using AVRStudio with AVRGCC 2.3 to using
> > > Programmers Notepad with WinAVR. When I compile the project,
> > > everything works fine except at the end I get a line saying: make: ***
> > > Warning: Clock skew detected.  Your build may be incomplete. Is this a
> > > problem? How can I fix it?
> >
> >    Clock skew can be detected on networked development machines, if
> > sharing build files between hosts, and the (time & date) clocks are not
> > synchronised. When the compiling host lags the fileserver, the generated
> > files are "older" than their inputs, which is a logical impossibility.
> > This makes make's decision making problematical, hence the warning.
> >
> >    When this last happened here, a few years back, I synchronised date &
> > time, effecting an immediate cure.
> >
> >    It is not easy to imagine a way for this to happen on a single host,
> > without something being seriously broken. (Perhaps my lack of experience
> > with anything but various unices limits my imagination, though. :-)
> >
> Clock skew can happen by itself on Win9x machines - it has to do with the
> low resolution of time stamps on FAT32 and the mechanisms used to fake a
> real time stamp.
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