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Workaround GHC #11214 by filtering JavaScriptFFI #3997

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Oct 18, 2016
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Workaround GHC #11214 by filtering JavaScriptFFI #3997

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15 changes: 10 additions & 5 deletions Cabal/Distribution/Simple/GHC.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -151,16 +151,21 @@ configure verbosity hcPath hcPkgPath conf0 = do

ghcInfo <- Internal.getGhcInfo verbosity implInfo ghcProg
let ghcInfoMap = Map.fromList ghcInfo
extensions = -- workaround https://ghc.haskell.org/ticket/11214
filterExt JavaScriptFFI $
-- see 'filterExtTH' comment below
filterExtTH $ extensions0

-- starting with GHC 8.0, `TemplateHaskell` will be omitted from
-- `--supported-extensions` when it's not available.
-- for older GHCs we can use the "Have interpreter" property to
-- filter out `TemplateHaskell`
extensions | ghcVersion < mkVersion [8]
, Just "NO" <- Map.lookup "Have interpreter" ghcInfoMap
= filter ((/= EnableExtension TemplateHaskell) . fst)
extensions0
| otherwise = extensions0
filterExtTH | ghcVersion < mkVersion [8]
, Just "NO" <- Map.lookup "Have interpreter" ghcInfoMap
= filterExt TemplateHaskell
| otherwise = id

filterExt ext = filter ((/= EnableExtension ext) . fst)

let comp = Compiler {
compilerId = CompilerId GHC ghcVersion,
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