[GHC] #10502: Bad interaction of sandboxes and coverage

[GHC]

#10502: Bad interaction of sandboxes and coverage
-------------------------------------+-------------------------------------
        Reporter:  qnikst            |                   Owner:
            Type:  bug               |                  Status:  closed
        Priority:  normal            |               Milestone:
       Component:  Code Coverage     |                 Version:  7.10.1
      Resolution:  invalid           |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------
Changes (by rwbarton):

 * status:  new => closed
 * resolution:   => invalid


Comment:

 This is a Cabal issue, not a GHC issue. Cabal does not really support
 installing packages built with `--enable-coverage`. The installation will
 succeed, and the libraries themselves work, but Cabal does not install the
 `.mix` files anywhere, so running hpc on a program that uses the libraries
 will fail, as you found.

 You can just omit `--enable-coverage` from the `install --dependencies-
 only` command to get a coverage report that includes the modules from the
 library you are testing (here network-transport-tcp). If you really want
 to get a report of how the network-transport-tcp tests cover the modules
 in its dependencies, then you need support for this to be added to Cabal.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10502#comment:1>
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