Cannot install Clash on Mac OS X, 10.12.6.

[latendre]

I tried to install Clash on OS X. It appears that even with ghc 8.2.2, the dependencies failed. Does it mean that we need exactly version 8.0 of GHC with Clash? See trace below.

Thank you.

-- Mario

ghc --version
The Glorious Glasgow Haskell Compilation System, version 8.2.2

cabal install clash-ghc --enable-documentation --enable-executable-dynamic
Resolving dependencies...
cabal: Could not resolve dependencies:
trying: clash-ghc-0.7.2 (user goal)
trying: base-4.10.1.0/installed-4.1... (dependency of clash-ghc-0.7.2)
next goal: ghci (dependency of clash-ghc-0.7.2)
rejecting: ghci-8.2.2/installed-8.2..., ghci-8.2.2, ghci-8.2.1 (conflict:
clash-ghc => ghci>=8.0.1 && <8.2)
rejecting: ghci-8.0.2, ghci-8.0.1 (conflict: base==4.10.1.0/installed-4.1...,
ghci => base==4.9.*)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: clash-ghc, template-haskell,
clash-lib, lens, clash-prelude, clash-verilog, base, ghc, reflection, unbound,
RepLib, mtl, ghci

[christiaanb]

Clash is deeply tied to GHC, so it’s been very difficult to support multiple versions. The currently released version only runs on GHC 8. While the next version will only work with GHC 8.2.

You can try the development version, which will work with your GHC 8.2 install, using the following instructions: https://github.com/clash-lang/clash-compiler/wiki/FAQ#how-do-i-run-the-development-version-of-clash

But note that there are considerable changes to the API compared to the released version.

[leonschoorl]

Or you could try to let stack manage everything.

1. Install stack using these instructions
2. Install Clash using the command: stack install --resolver=lts-9.20 --install-ghc clash-ghc
3. Now to use clash you have to run it with stack and the right resolver:
   stack --resolver lts-9.20 exec -- clash --vhdl YourFile.hs