[tor-bugs] #19180 [Core Tor/Tor]: Add new compiler warnings

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#19180: Add new compiler warnings
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 Reporter:  nickm         |          Owner:  nickm
     Type:  defect        |         Status:  new
 Priority:  Medium        |      Milestone:  Tor: 0.2.???
Component:  Core Tor/Tor  |        Version:
 Severity:  Normal        |     Resolution:
 Keywords:  029-proposed  |  Actual Points:
Parent ID:                |         Points:
 Reviewer:                |        Sponsor:
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Comment (by nickm):

 Branch `bug19180_easy` now has the easy cases from
 https://people.torproject.org/~nickm/warnings.html . The remaining
 "tricky" cases are maybe worth fixing so they don't trigger on our code,
 and maybe not.  I've annotated the table with which GCC version introduced
 each one.  (The "GCC 3" annotations mean "GCC 3 or earlier".)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19180#comment:5>
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