Usually, I'm using technique described here http://blog.haskell-exists.com/yuras/posts/stop-abusing-cpp-in-haskell.html
by using `extra-source-dir` key in cabal file and splitting implementation.

On 04/01/2015 05:56 PM, Aldo Davide wrote:
I don't see how you can avoid CPP. Even if cabal supported checking the OS version, you would still probably need CPP.
 
 

Sent: Wednesday, April 01, 2015 at 10:40 AM
From: "Sergey Bushnyak" <sergey.bushnyak@sigrlami.eu>
To: haskell-cafe@haskell.org
Subject: [Haskell-cafe] Specify OS version

Hi Cafe!
I have program written in Haskell and Swift that runs on Mac. This program uses some features that was introduced in last version of OS X “Yosemite” 10.10, but some of my users use previous version "Maverics " 10.9. Is there some technique that allows me to extend my cabal file and specify which *version* of os is currently in use and don't load some of modules?
AFAIK, Cabal's `conditional` doesn't provide such mechanism, but something like
```
if os(osx) && ver(=10.10)
if os(osx) && ver(<=10.9)
```
will be nice.

Maybe there is other approach to this problem?I don't want to use `CPP` extension to handle this within code.
Thanks
--
Best regards,
Sergey Bushnyak _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe