[GHC] #12517: Simplify runghc command line options

[GHC]

#12517: Simplify runghc command line options
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        Reporter:  harendra          |                Owner:  harendra
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  None              |              Version:  8.0.1
      Resolution:                    |             Keywords:  runghc
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by harendra):

 A problem with transparently passing unrecognized flags to ghc is a very
 confusing and hard to understand behavior like this:

 {{{
 runghc -package text-1.2.2.1 hello.hs

 text-1.2.2.0:1:74:
     Not in scope: ‘main’
     Perhaps you meant ‘min’ (imported from Prelude)
 }}}

 What happened here is that runghc passed `-package` option to ghc but it
 did not pass text-1.2.2.0 which is being treated as the program name. This
 happens because of different ways to pass `-package` and its argument. So
 we will have to use `--ghc-arg=` for the arg like this:

 {{{
 runghc -package --ghc-arg=text-1.2.2.1 hello.hs
 hello
 }}}

 If we had the same way to pass both the flag and the argument we won't
 have this very confusing behavior.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12517#comment:1>
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