[GHC] #9777: -msse flag could be handled better by the driver

[GHC]

#9777: -msse flag could be handled better by the driver
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       Reporter:  jstolarek          |                   Owner:
           Type:  bug                |                  Status:  new
       Priority:  normal             |               Milestone:
      Component:  Driver             |                 Version:  7.9
       Keywords:                     |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Moderate (less     |         Type of failure:  Other
  than a day)                        |               Test Case:
     Blocked By:                     |                Blocking:
Related Tickets:                     |  Differential Revisions:
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 I bumped into two small issues with `-msse` and `-msse4.2` flags:

 1. GHC accepts any flag of the form `-msseX.Y`, eg. `-msse3.14`. I think
 we should validate numbers passed by the user or - even better - pre-
 define a set of allowed `-msse` flags. Currently we have this definition:

 {{{
 Flag "msse"         (versionSuffix (\maj min d -> d{ sseVersion = Just
 (maj, min) }))
 }}}

 2. A direct consequence of above definition is that bash command-line
 auto-completion does not suggest `-msse4.2` flag.

 This is somewhat related to Austin's Phab:D165

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9777>
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