[GHC] #12691: Refine the behaviour of -dno-debug-output and -dtrace-level

[GHC]

#12691: Refine the behaviour of -dno-debug-output and -dtrace-level
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        Reporter:  mpickering        |                Owner:
            Type:  task              |               Status:  closed
        Priority:  low               |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Matthew Pickering <matthewtpickering@…>):

 In [changeset:"1c886eadcfbb593bb06bfff7b8a4914b5349f080/ghc" 1c886ea/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="1c886eadcfbb593bb06bfff7b8a4914b5349f080"
 Stop -dno-debug-output suppressing -ddump-tc-trace

 Summary:
 The user manual states that -dno-debug-output should suppress
 *unsolicited* debugging output which essentially amounts to calls
 to `pprTrace`. Before I unified the interface of `traceTc` and
 `traceRn`, the flag suppressed calls to `traceTc` but not to `traceRn`
 or any other tracing function already controlled by a flag.

 Thus, in order to make the behaviour more uniform, it seemed best to
 remove this one special case.

 Reviewers: austin, bgamari

 Reviewed By: bgamari

 Subscribers: thomie

 Differential Revision: https://phabricator.haskell.org/D2628

 GHC Trac Issues: #12691
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12691#comment:4>
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