oh right, that is a problem with clang no matter what. 

lens hit this issue, https://github.com/ekmett/lens/issues/357

I think the solution is "don't do that" if you want to support clang being the C compiler GHC uses, though you'll have to look at the diffs on that ticket closely to see how they addressed it

On Thu, Jan 2, 2014 at 4:31 PM, Sven Panne <svenpanne@gmail.com> wrote:

2014/1/2 Carter Schonwald <carter.schonwald@gmail.com>:

> sven,http://www.haskell.org/platform/mac.html  has a wrapper script that
> makes clang play nice with CPP, though a simpler alternative one can be

> found on manuel's page [...]

I've seen the wrappers before, but do they really solve the problem
for OpenGLRaw (concatenation via /**/ and replacement in strings)? As
I said, I don't have access to a Mac, but the mangled options don't
look like if they have anything to do with that. Can somebody confirm
that?