[GHC] #11749: Add long forms for multi-character short-form flags and possibly deprecate short forms

[GHC]

#11749: Add long forms for multi-character short-form flags and possibly deprecate
short forms
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  7.10.3
      Resolution:                    |             Keywords:
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 thomie):

 I would just like to point out that these flagnames do follow a system
 currently. Only the [https://downloads.haskell.org/~ghc/master/users-
 guide/using.html#modes-of-operation mode flags] start with two dashes.
 These are:

 {{{
 $ ghc801 --show-options | grep '^--'
 --help
 --version
 --numeric-version
 --info
 --show-options
 --supported-languages
 --supported-extensions
 --show-packages
 --print-project-version
 --print-project-git-commit-id
 --print-booter-version
 --print-stage
 --print-build-platform
 --print-host-platform
 --print-target-platform
 --print-have-interpreter
 --print-object-splitting-supported
 --print-have-native-code-generator
 --print-support-smp
 --print-unregisterised
 --print-tables-next-to-code
 --print-rts-ways
 --print-leading-underscore
 --print-debug-on
 --print-libdir
 --print-global-package-db
 --print-c-compiler-flags
 --print-c-compiler-link-flags
 --print-ld-flags
 --show-iface
 --make
 --interactive
 --abi-hash
 --frontend
 }}}

 The other 877 flags all start with a single dash.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11749#comment:2>
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