Now that the defaultCompilerNixName is used to choose which GHC to use
for tools we need to update haskellNixRoots to make sure the common
tools wind up in the cache.
To do this we add the compilerNixName as a dimension in ci.nix.
This has the added bonus of ensuring the tests a run with the
supported versions of ghc (not just the default one).
haskellNixRoots is also updated to include the tools built with the
defaultCompilerNixName (in particular cabal-install was not pinned
and this was the likely cause of significant builds due to cache
misses).
Projects like asterius and leksah that include dependencies on ghc. Sometimes the are needed by a setup.hs file (as is the case for the binaryen package used by asterius). The recent overlays merge broke this and #279 was needed to allow reinstallableLibGhc to be used to fix it. This PR adds a test case to make sure it is not inadvertently broken again. Also gives us a place to try out better ways to make this type of package work.* Test setup deps issue depending on ghc and Cabal
* Uses nixpkgs 19.09 + macOS wine fix on hydra/buildkite
* Enables macOS hydra tests
* disables musl tests for now
* Adds haskellNixRoots to tests
* Uses reinstallableLibGhc to fix the new setup-depends test
* Adds meta.platforms to haskell.nix components
* Set meta.platforms on cabal-install
* Builds some maintainer-scripts on hydra
* Pins hackage index-state for ghc-extra-packages
Hamish Mackenzie