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Date:	Thu, 6 Mar 2014 13:17:10 +0100
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Subject:	Fwd: struct tm problem
From:	Irfan Adilovic <irfanadilovic AT gmail DOT com>
To:	cygwin AT cygwin DOT com
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On Wed, Mar 5, 2014 at 3:05 PM, Corinna Vinschen wrote:
> On Mar  5 06:52, Eric Blake wrote:
>> On 03/05/2014 03:45 AM, Irfan Adilovic wrote:
>> > If it is recognized that the executable was compiled against a
>> > different sized struct tm, how would you instruct cygwin1.dll code not
>> > to write to tm_gmtoff?
>>
>> Linker magic, the same as how we converted to 64-bit stat, and the same
>> as what we will eventually have to do if we want to convert to 64-bit
>> time_t.  Basically, we add a new entry point, and alias the public name
>> to the new entry point.  Any old program is still linked to the old
>> name, where we know they use the smaller size.  Any new program is
>> linked to the new name, where we know they use the larger size.  New
>> programs cannot run against the old dll, but the new dll is able to
>> handle both old and new apps by virtue of dual entry points.
>
> Not in this case.  I just applied a patch which simply tests the API
> version of the executable and skips the code handling tm_offset and
> tm_zone, which are just a few lines anyway.

Can you point me to the patch in CVS? I'd like to see the code --
being curious, as I already said.

-- Irfan

> What you describe above is what we would have to do if we change
> sizeof(time_t) from 4 to 8 on 32 bit, which is something I won't have on
> my plate any time soon.  I'm quite satisfied that the 64 bit version has
> a 8 byte time_t.  Not that I wouldn't appreciate patches...
>
>
> Corinna
>
>
>
> --
> Corinna Vinschen                  Please, send mails regarding Cygwin to
> Cygwin Maintainer                 cygwin AT cygwin DOT com
> Red Hat

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