CPP strips out C-style comments

The following code fails to compiler with ``y not in scope:

{-# LANGUAGE CPP #-}
module Foo (x) where

x = ([y], z)

-- Oh, noes! Here comes a C-style comment: /usr/local/*
y = 42

-- And now let's close it */Setup.hs accidentally
z = 23

Apparently, the part between the /* and the */ got stripped out by the preprocessor. If we use a gcc's CPP mode, we should at least pass it some options to prevent this from happening.

Trac metadata

Trac field	Value
Version	6.10.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Driver
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