[GHC] #9213: Maybe important CPP warnings on ghcautoconf.h

[GHC]

#9213: Maybe important CPP warnings on ghcautoconf.h
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        Reporter:  asr               |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  7.10.1-rc2
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Changes (by thoughtpolice):

 * milestone:  7.10.1 => 7.12.1


Comment:

 Moving to 7.12 for now. FWIW, I can't quite tell if `cpphs` correctly
 handles this `#if define` syntax (which I assume traditional CPP does),
 meaning maybe upstream should fix it, but I don't think at the moment it's
 going to break anything severe based on this example.

 OTOH, this can probably be mitigated by modifying the rules to generate
 `ghcautoconf.mk`, which is actually a copy of some autoconf output created
 during the build; a `sed` invocation could probably do it - the rule to
 generate ghcautoconf is in `includes/ghc.mk` (search for
 `__GHCAUTOCONF_H__`).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9213#comment:13>
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