[GHC] #1853: hpc mix files for Main modules overwrite each other

[GHC]

#1853: hpc mix files for Main modules overwrite each other
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        Reporter:  guest             |                   Owner:  AndyGill
            Type:  bug               |                  Status:  new
        Priority:  lowest            |               Milestone:  7.12.1
       Component:  Code Coverage     |                 Version:  6.8.1
      Resolution:                    |                Keywords:
Operating System:  Linux             |            Architecture:  x86_64
 Type of failure:  None/Unknown      |  (amd64)
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by thomie):

 Replying to [comment:12 andygill]:
 > This one is tricky to fix, because of a baked in assumption. If anyone
 wants to help, or if I can find a willing student, I can give guidance
 about how to fix it.

 @andygill. I am currently looking at hpc.

 Do you think this issue is worth fixing? Multiple programs in the same
 directory can be nicely handled using `-main-is`. The following doesn't
 overwrite any .mix files:

 {{{#!hs
 $ cat ProgramA.hs
 module ProgramA where
 main = return ()

 $ cat ProgramB.hs
 module ProgramB where
 main = return ()

 $ ghc -fhpc -main-is ProgramA ProgramA
 $ ghc -fhpc -main-is ProgramB ProgramB

 $ ls .hpc
 ProgramA.mix ProgramB.mix
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/1853#comment:16>
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