[GHC] #12065: there is a way to override the .tix path with HPCTIXFILE

[GHC]

#12065: there is a way to override the .tix path with HPCTIXFILE
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           Reporter:  kostmo         |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Documentation  |           Version:  8.0.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Documentation
  Unknown/Multiple                   |  bug
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Under the
 [https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/hpc.html#idp46686522167856
 "Caveats and Shortcomings of Haskell Program Coverage" section], it says:

 > There is no way to change the name of the .tix file generated, apart
 from renaming the binary.


 However, specifying `HPCTIXFILE` as an environment variable when running
 the executable program does change the output path of the `.tix` file.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12065>
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