From:	Eric Rudd <rudd AT cyberoptics DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	"make" timeskew problem under Windows
Date:	Fri, 24 Apr 1998 13:05:59 -0500
Organization:	CyberOptics
Lines:	81
Message-ID:	<3540D487.CBD1559@cyberoptics.com>
Reply-To:	rudd AT cyberoptics DOT com
NNTP-Posting-Host:	rudd.cyberoptics.com
Mime-Version:	1.0
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

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Eli Zaretskii and I are attempting to track down some anomalies where
the DJGPP port of make v.3.76.1 reports a time skew under Windows.

The proximate cause of the problem is that "make" encounters a file
whose date is ahead of the system date, which is in turn caused by some
unknown clock anomaly under Windows.

Since the phenomenon appears to be dependent on the version of Windows
and the file system, we need to gather more data in order to make a
reliable patch to make.exe. Attached to this message is a short program
"makeskew.c", which opens a temporary file and dumps the file and system
times to stdout.

If you have experienced timeskew problems with "make", or if this
problem interests you, please compile the attached "makeskew.c" program
under DJGPP v2.01, and run it with output redirected to a file, e.g.

   makeskew >makeskew.dat

The program runs continuously; press any key to quit. The four columns
of output are, respectively, the system time, the file modification
time, the file modification time minus the system time, and the
high-resolution time from uclock(). Of particular interest is any
instance where the file time gets ahead of the system time.

In order for your results to be useful you should also report the
following:

1. The version of Windows that is running. You can find this by clicking
on Control Panel, System, General Properties under Win95. The version
will be something like 4.00.950 B. Note that this number may be
*different* from the one you get by typing in VER at the command prompt;
see

   http://www.compren.com/faq.html#Winver95

for more details.

2. The type of file system your computer uses (e.g. FAT16, FAT32, NTFS,
etc.) "makeskew" prints out this information, but is unable to
distinguish FAT16 from FAT32.

-Eric Rudd
rudd AT cyberoptics DOT com
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