[tor-bugs] #21735 [Core Tor/Tor]: Add support for unsigned time_t, to support QNX

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#21735: Add support for unsigned time_t, to support QNX
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     Reporter:  nickm         |      Owner:
         Type:  enhancement   |     Status:  new
     Priority:  Low           |  Milestone:  Tor: unspecified
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 On #18184, ryankung reports that QNX has an unsigned time_t, and therefore
 is unsupported by Tor.

 To support unsigned time_t, someone will need to audit all our uses of
 time_t, and make sure that we don't do any signed/unsigned comparisons
 with it, that we can't underflow it, and that we don't use any negative
 sentinel values.  Then we can revert the configuration code in #18184 that
 blocked compilation when time_t is unsigned.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21735>
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