[GHC] #5992: Silence gen_contents_index for the common case.

[GHC]

#5992: Silence gen_contents_index for the common case.
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    Reporter:  td123             |       Owner:  td123           
        Type:  feature request   |      Status:  new             
    Priority:  normal            |   Milestone:  7.6.1           
   Component:  Documentation     |     Version:  7.4.1           
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:                    |  
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Comment(by td123):

 Attached 2 patches, 1 for ghc 7.4.2 and 1 for ghc HEAD that implements
 this feature request.

 I had to submit 2 patches since gen_contents_index differs in the 2
 versions.

 I looked into using getopts and getopt (gnu) both of which were not good.
 getopts only supports single character flags and getopt (gnu) wouldn't be
 supported on BSD and mac systems.
 So I implemented my own flag parser.

 Also added a --help flag for user convenience since it seemed simple.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5992#comment:2>
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