It broke during the ic_exports tidyup
(e.g. commit 5cd39aa3).

Add documentation describing all the variables that contain options
for Haskell compilations, what they mean and where they are (or can
be) defined.

In due course we should expand this to cover all the build system
variables, and move it to the wiki, but this is a start.

replacing them by the appropriate flag.

Suggested by Trac #5526.

in response to Neil's suggestion on Trac #4877

Also removed the type argument to Any in primops.txt.pp. I don't
see why we need it, and it now breaks haddocking GHC.Prim.

We now have addrToAny# rather than addrToHValue#, and both addrToAny#
and mkApUpd0# return "Any" rather than "a". This makes it a little
easier to see what's going on, and fixes a warning in ByteCodeLink.

They weren't smart enough to see our GADT pattern matches are complete,
so gave a warning.

The CmmCallConv constructor was missing.

And some knock-on changes

$TargetOS_CPP wasn't getting defined in a bindist, which meant the
code to use gcc-4.2 instead of gcc on OS X wasn't working. Now fixed,
by moving some of configure.ac's code into the shared aclocal.m4.

You can now use type functions in FFI types.

Newtypes are now only looked through if the constructor is in scope.

We need to generate enough parens so that -ddump-splices is
correct Haskell.  There is certainly further to go.

(in instance and standalone deriving decls)

Fixes Trac #5513.

Fixes Trac #5514.  The fix is simply to delete some code.

We should not allow things like

class C a b where
  type F a :: *

instance C (p,q) r where
  type F (p,q) = r   -- No! fvs(rhs) should be a subset
                     --     of fvs(lhs)

Outputable.quotes claimed to drop the quotes if the enclosed thing has
a trailing single quote; but its implementation checked for
a *leading* quote.

Fixes Trac #5509