[GHC] #4243: Make a proper options parser for the RTS

[GHC]

#4243: Make a proper options parser for the RTS
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        Reporter:  igloo             |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Runtime System    |              Version:  6.13
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:  7535
 Related Tickets:  #9839 #13308      |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by AndreasK):

 * related:  #9839 => #9839 #13308


Comment:

 When parsing arguments to flags ghc treats leading whitespace different
 depending on the flag.

 ghc +RTS '-N 2' -s -RTS --version
 Here '-N 2' is parsed as -N2
 ghc +RTS '-s file' -RTS --version
 Here '-N 2' is parsed as '\ file', a filename starting with a space.

 If this rework ever happens leading spaces in arguments should either be
 uniformly ignored or treated as errors.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4243#comment:24>
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