[Hackage] #253: Check for invalid operating system names

[Hackage]

#253: Check for invalid operating system names
----------------------------------+-----------------------------------------
  Reporter:  duncan               |        Owner:         
      Type:  enhancement          |       Status:  new    
  Priority:  normal               |    Milestone:         
 Component:  Cabal library        |      Version:  1.2.3.0
  Severity:  normal               |     Keywords:         
Difficulty:  very easy (<1 hour)  |   Ghcversion:  6.8.2  
  Platform:                       |  
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 Some packages (eg hslogger-1.0.4) have incorrect operation system names
 tests:
 {{{
     if !os(win32)
         Build-Depends: unix
 }}}

 It's incorrect because there is no such operating system "win32", there is
 "windows" which is an alias for "mingw32".

 So we should check for these problems. At the moment the OS is just a
 String . We should decide if we want to use an enumeration or leave it
 more flexible and just warn about unknown ones.

 Checks are easy to add, see `Distribution/PackageDescription/Check.hs`

-- 
Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/253>
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