[tor-bugs] #13577 [Tor]: Fix clang compilation warnings in tor, trunnel

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#13577: Fix clang compilation warnings in tor, trunnel
------------------------+------------------------------
     Reporter:  teor    |      Owner:
         Type:  defect  |     Status:  needs_review
     Priority:  minor   |  Milestone:
    Component:  Tor     |    Version:  Tor: unspecified
   Resolution:          |   Keywords:  clang
Actual Points:          |  Parent ID:
       Points:          |
------------------------+------------------------------

Comment (by teor):

 It turns out that only macros like (A == B) trigger the error.
 Adding a no-op like "| | 0" to the end of the macro breaks this pattern-
 matching.
 The final transformation is: (A == B) to ((A == B) | | 0) with an
 appropriate comment.

 The benefit of this change over the "!!" change is that it can be
 performed in the macro itself. (Perhaps this also works for "!!" in the
 macro? I can't remember if I checked it or not. But I think "| | 0" is
 just as clear as "!!".)

 The fixed branch is: silence-warnings-in-macros
 It includes the trunnel and non-trunnel commit.
 It also includes a very minor fix to a comment in src/or/or.h:
 {{{
  #define PROXY_SOCKS5 3
 -/* !!!! If there is ever a PROXY_* type over 2, we must grow the
 proxy_type
 +/* !!!! If there is ever a PROXY_* type over 3, we must grow the
 proxy_type
   * field in or_connection_t */
 }}}
 Normally, I'd put this in its own commit and bug, but it hardly seems
 worth it. (It snuck in accidentally because I fixed the typo while doing
 the other changes.)

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13577#comment:4>
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