[GHC] #10259: HPC code coverage fails

[GHC]

#10259: HPC code coverage fails
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        Reporter:  LukeHoersten      |                   Owner:
            Type:  bug               |                  Status:  closed
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.10.1
      Resolution:  invalid           |                Keywords:  hpc
Operating System:  MacOS X           |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by rwbarton):

 Right, actually the problem specifically is that Cabal doesn't install the
 `.mix` files anywhere when installing a package built with `--enable-
 coverage`. So effectively you never want to use `cabal install --enable-
 coverage`. This is a Cabal issue, not a GHC issue.

 > Also, it's unclear to me when to use -fhpc vs. --enable-coverage. Is
 there anywhere this is documented?

 `-fhpc` is an option to GHC, and `--enable-coverage` is an option to
 cabal-install. If you use `--enable-coverage` then Cabal will take care of
 passing `-fhpc` to GHC.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10259#comment:5>
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