This sounds like the right approach. To whatever degree existing
tooling makes this difficult, maybe we can fix existing tooling?
On Wed, Oct 7, 2015 at 10:34 AM, Michael Orlitzky
(replying to no one in particular)
This problem isn't specific to Haskell. In every other language, you have projects that support major versions of toolkits, compilers, libraries and whatnot. And there's already a tool for it: git.
Instead of using #ifdef to handle four different compilers, keep a branch for each. Git is designed to make this easy, and it's usually trivial to merge changes from the master branch back into e.g. the ghc-7.8 branch. That way the code in your master branch stays clean. When you want to stop supporting an old GHC, delete that branch.
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