bug#37974: eww produces "error in process filter: Specified time is not representable"

[A.C.]

OK, so it *is* a 32-bit problem. This is awesome :):

- on my 32-bit system the highest I can go with an error-less format-time-string is 

(format-time-string "%a %b %d %H:%M:%S %Y GMT" (list 32767 65535 0 0))

That will give a total of 

32767*2**16+65535 = 2147483647 = 2**31-1

seconds from the Unix epoch, i.e. spot-on the year-2038 problem:

https://en.m.wikipedia.org/wiki/Year_2038_problem

- on the other hand, on my 64-bit systems the highest I can go is 

(format-time-string "%a %b %d %H:%M:%S %Y GMT" (list 1034058169428 61391 0 0))

This puzzled me a bit, but looking at the date, it's Wed Dec 31 23:59:59 GMT year (wait for it)

2147485547 = 1900 + 2**31-1

So it's again the usual issue, kicked up to higher timestamps in the 64-bit case:

http://www.unixguide.net/sun/faq/6.27.shtml

On October 29, 2019 10:06:28 AM EDT, "A.C." <achirvasub@gmail.com> wrote:

On October 29, 2019 8:47:02 AM EDT, Lars Ingebrigtsen <larsi@gnus.org> wrote:
>"A.C." <achirvasub@gmail.com> writes:
>
>> On the other hand, the Debian i686 system that doesn't load arxiv.org
>has a
>> largest valid n of
>
>I'm not quite sure I understood the bug report -- are you saying that
>this is only an issue on 32-bit systems?
>

I don't have access to enough systems to tell for sure. I do know it's only happening on the one 32-bit system I have access to right now, and also that I hit the problem a while back on 32-bit ARM:

https://github.com/termux/termux-packages/issues/2614

(and have not see the issue on any 64-bit systems)

>In any case, Emacs 27 has bignum support, so this should hopefully not
>be a problem any more. Can you try the test case with the current
>Emacs
>trunk and see whether it's still present?

That will be tough. This 32-bit machine overheats something fierce; I doubt I can even clone the git repo without it dying, let alone compile.

-- 
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