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

[GHC]

#9213: Maybe important CPP warnings on ghcautoconf.h from cpphs
-------------------------------------+-------------------------------------
        Reporter:  asr               |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  7.10.1
       Component:  Compiler          |                 Version:  7.10.1-rc1
      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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Comment (by asr):

 A minimal example (using cpp 1.18.6 and GHC 7.10.1 RC1):

 {{{
 $ cat Main.hs
 {-# LANGUAGE CPP #-}

 module Main where

 -- Used for example by Alex 3.1.4 and GHC source code.
 #include "ghcconfig.h"

 main :: IO ()
 main = putStrLn "Hello, World!"
 }}}

 {{{
 $ ghc -pgmP cpphs -optP --cpp Main.hs
 ...
 Warning: trailing characters after #if directive in file
 /usr/local/stow/ghc-7.10.0.20141222-bin/lib/ghc-7.10.0.20141222/include/ghcautoconf.h
 at line 379 col 1:  AC_APPLE_UNIVERSAL_BUILD
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9213#comment:11>
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