[GHC] #13190: Add a flag to dump compiler output as JSON

[GHC]

#13190: Add a flag to dump compiler output as JSON
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        Reporter:  mpickering        |                Owner:  mpickering
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3010
       Wiki Page:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"91691117fc194c525f58ccd5b266dd1d10493e5a/ghc"
 91691117/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="91691117fc194c525f58ccd5b266dd1d10493e5a"
 Add a flag to emit error messages as JSON

 This patch adds the flag `-ddump-json` which dumps all the compiler
 output as a JSON array. This allows tooling to more easily parse GHC's
 output to display to users.

 The flag is currently experimental and will hopefully be refined for the
 next release.  In particular I have avoided any changes which involve
 significant refactoring and provided what is easy given the current
 infrastructure.

 Reviewers: austin, bgamari

 Reviewed By: bgamari

 Subscribers: DanielG, gracjan, thomie

 Differential Revision: https://phabricator.haskell.org/D3010

 GHC Trac Issues: #13190
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13190#comment:6>
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