On Thu, Mar 26, 2015 at 11:40 AM Erik Hesselink <[email protected]> wrote:
> On Mon, Mar 23, 2015 at 6:44 AM, Mark Lentczner > <[email protected]> wrote: > > > 7. Cabal incompatible API change > > In particular, the api that a custom Setup.hs uses. > > Distribution.Simple.UserHooks changed the type of a hook. It should not, > it > > should have added another to do what it wanted. The poblem is you can't > use > > CPP in Setup.hs. And so now anyone using the testHook hook is in a > pickle: > > Your Setup.hs can't work in both 7.10 and 7.8! > > It can, but it's a bit tricky. When this happened before, people used > a type class with two instances, where one of them filled in a default > argument, IIRC. I can't find the exact code now, perhaps others > remember this better. > > > I wrote a blog post in June of last year[1] and was told that some of those tricks are used to Cabal files. I also don't have a link to a real example, but the blog post may help. Michael [1] http://www.yesodweb.com/blog/2014/06/evil-conditional-compile
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