[tor-bugs] #29537 [Core Tor/Tor]: verify intptr_t round-trip through void *

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#29537: verify intptr_t round-trip through void *
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     Reporter:  catalyst      |      Owner:  (none)
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: unspecified
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  portability technical-debt
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 Round-trip of `intptr_t` through `void *` isn't explicitly guaranteed by
 C99. There are implementation-defined behaviors for integer to `void *`,
 and vice versa. Only a round-trip of `void *` through `intptr_t` is
 guaranteed, not vice versa. We seem to depend on being able to store an
 integer in a `void *` from time to time, e.g., to store integers in a
 smartlist.

 We should run some automated tests to make sure this works as we expect,
 at least until we stop needing this behavior. (See also #23714.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29537>
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