[tor-bugs] #32579 [Core Tor/Tor]: Use clang's -Wimplicit-fallthrough and fallthrough attribute on case statements

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#32579: Use clang's -Wimplicit-fallthrough and fallthrough attribute on case
statements
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 Reporter:  teor              |          Owner:  (none)
     Type:  enhancement       |         Status:  new
 Priority:  Medium            |      Milestone:  Tor: unspecified
Component:  Core Tor/Tor      |        Version:
 Severity:  Normal            |     Resolution:
 Keywords:  code-correctness  |  Actual Points:
Parent ID:                    |         Points:  1
 Reviewer:                    |        Sponsor:
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Comment (by teor):

 Here's how we can check for that feature in clang:
 https://clang.llvm.org/docs/LanguageExtensions.html#feature-checking-
 macros

 I think the sa,e syntax works on gcc, but we should check.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32579#comment:1>
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