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NNTP-Posting-Date: Fri, 18 Mar 2005 14:01:44 -0600
From: "Randy Brukardt" <randy@rrsoftware.com>
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 <877jk65a2f.fsf@insalien.org> <x7vekeciwtj.fsf@smaug.pushface.org>
Subject: Re: How to cache output of the compiler aka ccache
Date: Fri, 18 Mar 2005 14:04:04 -0600
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Date: 2005-03-18T14:04:04-06:00
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"Simon Wright" <simon@pushface.org> wrote in message
news:x7vekeciwtj.fsf@smaug.pushface.org...
...
> We had an interesting bug with 3.16a1 on Windows where compilations
> ran slower if the compiler had been installed in the winter months
> (outside daylight saving time) -- a feature involving the Windows
> installer, I think; the timestamps in the library were all one hour
> out.

This is a bizarre Windows "feature". When daylight saving time changes, all
of the time stamps on your existing files will change one hour. (If you
don't believe me, check it out when the time changes.)

If you have code the previously stored the time stamp somewhere (say in a
dependency file), it will suddenly be off an hour, and thus will mismatch.

Janus/Ada doesn't have the problem with the core runtime (since the source
isn't supplied), but sometimes a daylight saving time change will force a
rebuild of an entire project. I've never figured out a good solution, since
the behavior is so odd.

                           Randy.