[tor-bugs] #23739 [Core Tor/Tor]: improve documentation on how we use gcov

[Tor Bug Tracker & Wiki]

#23739: improve documentation on how we use gcov
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     Reporter:           |      Owner:  catalyst
  catalyst               |
         Type:  defect   |     Status:  assigned
     Priority:  Medium   |  Milestone:  Tor: 0.3.2.x-final
    Component:  Core     |    Version:
  Tor/Tor                |   Keywords:  new-developers tor-doc tor-tests-
     Severity:  Normal   |  coverage
Actual Points:           |  Parent ID:
       Points:           |   Reviewer:
      Sponsor:           |
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 Ticket #16792 (0.2.9.1-alpha) introduced some automation for excluding
 lines from filtered gcov output.  We should document the prefixes it uses
 to mark excluded lines.  There should also be information about how to
 read the gcov-diff files, which are processed to remove line numbers,
 among other things.  We should also refer to the gcc documentation for
 gcov at https://gcc.gnu.org/onlinedocs/gcc/Invoking-Gcov.html

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23739>
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