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Date:	Mon, 13 May 2013 18:57:12 +0200
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: mktime loop
Message-ID:	<20130513165712.GH8890@calimero.vinschen.de>
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References:	<5244063b734b165baf34bdebaff0aca5 AT denis-excoffier DOT org> <20130513153651 DOT GD5045 AT calimero DOT vinschen DOT de> <20130513154921 DOT GF8890 AT calimero DOT vinschen DOT de> <27BBE8FE-303A-432D-94AA-AF834124D125 AT Denis-Excoffier DOT org>
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On May 13 18:41, Denis Excoffier wrote:
> On 2013-05-13 17:49, Corinna Vinschen wrote:
> > Erm... hang on.  Is that really a problem?  2147483647 is 0x7fffffff,
> > which is the maximum you get with a 4 byte time_t (== signed long)
> > anyway.  If you switch the date to 2038-01-20, the value will be
> > negative, and therefore outside the scope of the 4 byte time_t.  So this
> > is a hard restriction of using 4 byte time_t.
> > 
> > The solution is:
> > 
> > - Either somebody changes 32 bit Cygwin to 8 byte time_t while keeping
> >  all the 4 byte time_t APIs intact to maintain compatibility with
> >  existing binaries(*),
> > 
> > - or, you switch to a 64 bit Windows and use 64 bit Cygwin ;)
> > 
> I understand.
> 
> I suppose you will however be willing to provide us a means to workaround
> the "autoconf mktime usability test failing" (see for example in
> gawk-4.1.0 where all the tm fields are set to 128). Now, instead of only
> failing (i presume), it hangs. Sorry, this specific point should have been
> noticed in my original post.
> 
> Or do we have to patch every impacted ./configure?

Good point.  I guess the right thing to do here is for mktime to
return -1 instead of hanging.  I look into that.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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