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 Message 242,923 of 243,097 
 James Russell Kuyper Jr. to Keith Thompson 
 Re: printf and time_t 
 08 Jan 26 19:16:19 
 
From: jameskuyper@alumni.caltech.edu

On 2026-01-07 16:32, Keith Thompson wrote:
> Lawrence D’Oliveiro  writes:
>> On Wed, 7 Jan 2026 12:45:30 -0500, James Russell Kuyper Jr. wrote:
>>> On a different point, I used time_t as an example. It would have
>>> been better to use ptrdiff_t instead, since  has a macro
>>> for that type, and doesn't have one for time_t.
>>
>> This is why you have configure scripts, so they can figure out the
>> right types to use for building on your platform.
>
> I don't follow.  ptrdiff_t is defined in , and is the correct
> type for the result of subtracting two pointers.  What relevant
> information would a configure script give you?

I suspect he's referring to time_t, not ptrdiff_t. I mentioned the
absence of a macro #defined in  as a reason why I should not
have used time_t as an example.

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