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

[GHC]

#9777: -msse flag could be handled better by the driver
-------------------------------------+-------------------------------------
              Reporter:  jstolarek   |            Owner:  dredozubov
                  Type:  bug         |           Status:  new
              Priority:  normal      |        Milestone:
             Component:  Driver      |          Version:  7.9
            Resolution:              |         Keywords:  newcomer
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Moderate (less
       Type of failure:  Other       |  than a day)
             Test Case:              |       Blocked By:
              Blocking:              |  Related Tickets:  #8404
Differential Revisions:  Phab:D504   |
-------------------------------------+-------------------------------------

Comment (by dredozubov):

 jstolarek, I definitely meant "the latest SSE version". I'll try to look
 into writing tests for this patch tonight, sadly this week've been really
 busy and i was unable to work on something else except my day work.

 > all msse flags are listed by --show-options flag
 > incorrect -msse flag is rejected (see
 ​https://phabricator.haskell.org/D503 for an example how to do that).

 This test case seems a little off to me. It tests OptKind + --show-options
 behaviour(which currently works), not patch in question. Maybe it'll be a
 little better to test that right flag(the latest sse version) would be
 set, if user provides two or more.

 carter, afaik for each pair of versions of sse older one will contain
 subset of instructions from newer. I'm not really an expert on this matter
 though, so If someone else can verify that - it would be great.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9777#comment:11>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler