[tor-bugs] #29036 [Core Tor/Tor]: Coverage merge failures cause test_process_slow stderr check to fail

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#29036: Coverage merge failures cause test_process_slow stderr check to fail
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 Reporter:  teor                                 |          Owner:  teor
     Type:  defect                               |         Status:
                                                 |  needs_revision
 Priority:  High                                 |      Milestone:  Tor:
                                                 |  0.4.1.x-final
Component:  Core Tor/Tor                         |        Version:  Tor:
                                                 |  unspecified
 Severity:  Major                                |     Resolution:
 Keywords:  asn-merge, nickm-merge,              |  Actual Points:  0.6
  041-accepted-20190115, regression, tor-ci,     |
  029-backport, 034-backport, 035-backport,      |
  040-backport, tor-ci-fail-sometimes            |
Parent ID:                                       |         Points:  0.5
 Reviewer:  catalyst                             |        Sponsor:
-------------------------------------------------+-------------------------

Comment (by teor):

 Replying to [comment:29 nickm]:
 > Sorry, I think we need a different target name for this new "reset-gcov"
 semantics, if that's what we're going for.  In the current semantics,
 running 'reset-gcov' after a test run resets the coverage, but doesn't
 stop you from running "make check" again.  But if we change it to remove
 the gcno files too, that will means that you need to do a full "make
 clean" and "make" before you can run the tests for coverage again.

 I think I understand better now:
 * we MUST NOT delete gcno files, because they are created when the code is
 compiled
 * we MUST delete gcda files to remove the warning (and make our coverage
 accurate)
 * we MAY delete gcov files, because they take up space in the cache (and
 leaving old files around might make our coverage inaccurate)

 I'll amend that commit to delete gcda and gcov files, but leave gcno
 files.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29036#comment:30>
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