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

From: David Brown
Subject: Re: [avr-gcc-list] clock skew detected
Date: Tue, 30 Sep 2003 08:53:54 +0200

> 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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