[GHC] #5942: implement POSIX confstr() in System/Posix/Unistd.hsc

[GHC]

#5942: implement POSIX confstr() in System/Posix/Unistd.hsc
-------------------------------+--------------------------------------------
  Reporter:  clint             |          Owner:                         
      Type:  feature request   |         Status:  new                    
  Priority:  normal            |      Milestone:  7.6.1                  
 Component:  libraries/unix    |        Version:  7.4.1                  
Resolution:                    |       Keywords:  confstr                
        Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple       
   Failure:  None/Unknown      |     Difficulty:  Easy (less than 1 hour)
  Testcase:                    |      Blockedby:                         
  Blocking:                    |        Related:                         
-------------------------------+--------------------------------------------
Changes (by simonmar):

  * owner:  simonmar =>
  * status:  patch => new


Comment:

 `confstr` is fine, but most of those values (e.g. `_CS_LFS_CFLAGS`) are
 non-portable as far as I can tell.  The only portable one is `_CS_PATH`.

 See e.g. the POSIX pages that list the standard defines:
 [http://pubs.opengroup.org/onlinepubs/009695399/basedefs/unistd.h.html]
 and
 [http://pubs.opengroup.org/onlinepubs/009695399/functions/confstr.html]

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5942#comment:4>
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