1. It doesn’t actually get used by Cabal (as of several years): https://github.com/haskell/cabal/issues/4278 2. cabal-install does cross-compilation + preprocessors wrong. By default using ghc as preprocessor works. I think some of the reasons for using cpphs no longer apply (e.g. hugs on windows) Cheers, Vanessa McHale

On Sep 19, 2022, at 9:19 PM, Anthony Clayden wrote:

Thank you to the author and maintainers of cpphs https://hackage.haskell.org/package/cpphs https://hackage.haskell.org/package/cpphs

It has tightly-focussed functionality for what I wanted to do: a more haskell-friendly counterpart to cpp.

How to get it to behave as I wanted wasn't always obvious. I made some notes https://stackoverflow.com/a/73768057/2840542 https://stackoverflow.com/a/73768057/2840542

Haskell libraries generally use cpp -- and then users complain how awkward it can be. I don't see that cpp does anything better/different vs cpphs -- that is, cpphs understands all the #if compiler_version logic. Then why isn't every library preferring cpphs?

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