[GHC] #8601: runghc from standard input and --ghc-args

[GHC]

#8601: runghc from standard input and --ghc-args
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        Reporter:  wuzzeb            |            Owner:
            Type:  bug               |           Status:  patch
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.6.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by Austin Seipp <austin@…>):

 In [changeset:"ec4af3fbcd47ca3af1727e70fa20e7cb8db0fb41/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="ec4af3fbcd47ca3af1727e70fa20e7cb8db0fb41"
 runghc: Fix interaction of stdin and --ghc-args

 When reading the program from standard input, runghc did not properly
 handle the --ghc-arg= escape for arguments to ghc which do not start
 with a dash, since arguments were processed twice and the first time the
 --ghc-arg= was stripped.  Now arguments are only processed once.  For
 backwards compatibility, a prefix of --ghc-arg=--ghc-arg= is allowed
 since this prefix will work on both old and new versions of ghc.

 This fixes #8601

 Signed-off-by: Austin Seipp <austin at well-typed.com>
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8601#comment:2>
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