There is a broader question about language-c (https://github.com/haskell/c2hs/issues/57#issuecomment-27450437): there have been various requests to support the most recent C standard as well as C99, which would be a big job, but Geoffrey Mainland has another package (http://hackage.haskell.org/package/language-c-quote) that supports the latest standards, although with less analysis than language-c and probably less extensively tested than language-c (just because it's newer).  Manuel has suggested that merging the two efforts would be a good idea.  I don't know how keen Geoffrey would be on that, I don't know how much work it would be, and I don't know how much work it would be to update the reverse dependencies of the two existing packages (language-c has 13, language-c-quote has 2) to use a new merged package.

If we could get some agreement on a way forward, I'd be open to working on producing a merged language-c and updating c2hs to use the new merged version as a test case.  (Of course, I don't want to do this in a way that results in a third C language package that needs to be supported!)

Cheers,

Ian.