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This new ghc feature was actually added in ghc 7.10 but very limited, then extended significantly in 8.0.1 but with a severe bug for our use case and then should be working fine in 8.0.2 onwards. This patch adds basic support for writing .ghc.environment files. This feature will be used later in cabal-install, but it makes sense for the functionality to live in Cabal next to the other code that knows all too much about GHC. .ghc.environment file support works in ghc 8.0.2 onwards It was actually added in ghc 7.10 but very limited, then extended significantly in 8.0.1 but with a severe bug for our use case and then should be working fine in 8.0.2 onwards.
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