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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