[GHC] #7327: Inconsistent behavior for relative paths in runProcess

[GHC]

#7327: Inconsistent behavior for relative paths in runProcess
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 Reporter:  snoyberg          |          Owner:                   
     Type:  bug               |         Status:  new              
 Priority:  normal            |      Component:  libraries/process
  Version:  7.6.1             |       Keywords:                   
       Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple 
  Failure:  None/Unknown      |       Testcase:                   
Blockedby:                    |       Blocking:                   
  Related:                    |  
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 This was initially reported as a bug in cabal:

 https://github.com/haskell/cabal/issues/1058

 The relevant fix demonstrates the issue:

 https://github.com/snoyberg/cabal/commit/48082b90726093298df8559b365ed08805ca6d8f

 It seems that on Linux, a relative path for the executable is derived from
 the new working directory, whereas on Mac it is derived from the old
 working directory. (I have not tested on other systems.) Ideally, the
 behavior would be consistent across OSes, which IMO the more intuitive
 behavior being the current Mac behavior. The simplest solution would be to
 always turn the relative paths into absolute paths before changing working
 directories. However, doing so may introduce a performance hit.

 Alternatively, a documentation fix would be good so that it's at least
 obvious that behavior is platform-specific. I can write a patch for either
 the change in behavior or the updated documentation, I'd just like to know
 which is preferred.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7327>
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