[GHC] #11678: runhaskell (and ghc, ghci) fail to run if HOME is not set

[GHC]

#11678: runhaskell (and ghc, ghci) fail to run if HOME is not set
-------------------------------------+-------------------------------------
           Reporter:  crosser        |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  7.10.3
           Keywords:                 |  Operating System:  Linux
       Architecture:  x86_64         |   Type of failure:  Compile-time
  (amd64)                            |  crash
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Steps to reproduce:

 {{{
 $ env -i ghc
 HOME: getAppUserDataDirectory: does not exist (no environment variable)
 $ ghc --version
 The Glorious Glasgow Haskell Compilation System, version 7.10.3
 }}}

 This may be not a big deal for the compiler and repl, but there are use
 cases to run `runhaskell` without HOME, e.g. I encountered this when
 running a cgi script under Apache. I think that the problem was introduced
 after 7.8.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11678>
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