Improve ghc version check (#535)

- retrieve runtime version from ghc executable, not from pkg db (ghc-check 0.3.0.0)
- Do not error when unable to retrieve runtime version

exe/Rules.hs

@@ -15,7 +15,6 @@ import           Data.ByteString.Base16         (encode)
 import qualified Data.ByteString.Char8          as B
 import           Data.Functor                   ((<&>))
 import           Data.Text                      (Text, pack)
-import           Data.Version                   (Version)
 import           Development.IDE.Core.Rules     (defineNoFile)
 import           Development.IDE.Core.Service   (getIdeOptions)
 import           Development.IDE.Core.Shake     (actionLogger, sendEvent, define, useNoFile_)
@@ -24,7 +23,7 @@ import           Development.IDE.Types.Location (fromNormalizedFilePath)
 import           Development.IDE.Types.Options  (IdeOptions(IdeOptions, optTesting))
 import           Development.Shake
 import           GHC
-import           GHC.Check                      (runTimeVersion, compileTimeVersionFromLibdir)
+import           GHC.Check                      (VersionCheck(..), makeGhcVersionChecker)
 import           HIE.Bios
 import           HIE.Bios.Cradle
 import           HIE.Bios.Environment           (addCmdOpts)
@@ -102,15 +101,20 @@ getComponentOptions cradle = do
         -- That will require some more changes.
         CradleNone      -> fail "'none' cradle is not yet supported"
 
-compileTimeGhcVersion :: Version
-compileTimeGhcVersion = $$(compileTimeVersionFromLibdir getLibdir)
+ghcVersionChecker :: IO VersionCheck
+ghcVersionChecker = $$(makeGhcVersionChecker (pure <$> getLibdir))
 
-checkGhcVersion :: Ghc (Maybe HscEnvEq)
+checkGhcVersion :: IO (Maybe HscEnvEq)
 checkGhcVersion = do
-    v <- runTimeVersion
-    return $ if v == Just compileTimeGhcVersion
-        then Nothing
-        else Just GhcVersionMismatch {compileTime = compileTimeGhcVersion, runTime = v}
+    res <- ghcVersionChecker
+    case res of
+        Failure err -> do
+          putStrLn $ "Error while checking GHC version: " ++ show err
+          return Nothing
+        Mismatch {..} ->
+          return $ Just GhcVersionMismatch {..}
+        _ ->
+          return Nothing
 
 createSession :: ComponentOptions -> IO HscEnvEq
 createSession (ComponentOptions theOpts _) = do
@@ -122,7 +126,7 @@ createSession (ComponentOptions theOpts _) = do
         dflags <- getSessionDynFlags
         (dflags', _targets) <- addCmdOpts theOpts dflags
         setupDynFlags cacheDir dflags'
-        versionMismatch <- checkGhcVersion
+        versionMismatch <- liftIO checkGhcVersion
         case versionMismatch of
             Just mismatch -> return mismatch
             Nothing ->  do

ghcide.cabal

@@ -192,7 +192,7 @@ executable ghcide
         directory,
         extra,
         filepath,
-        ghc-check >= 0.1.0.3,
+        ghc-check >= 0.3.0.1,
         ghc-paths,
         ghc,
         gitrev,

src/Development/IDE/GHC/Util.hs

@@ -167,7 +167,7 @@ moduleImportPath (takeDirectory . fromNormalizedFilePath -> pathDir) mn
 data HscEnvEq
     = HscEnvEq !Unique !HscEnv
     | GhcVersionMismatch { compileTime :: !Version
-                         , runTime     :: !(Maybe Version)
+                         , runTime     :: !Version
                          }
 
 -- | Unwrap an 'HsEnvEq'.
@@ -181,7 +181,7 @@ hscEnv' GhcVersionMismatch{..} = Left $
         ["ghcide compiled against GHC"
         ,showVersion compileTime
         ,"but currently using"
-        ,maybe "an unknown version of GHC" (\v -> "GHC " <> showVersion v) runTime
+        ,showVersion runTime
         ,". This is unsupported, ghcide must be compiled with the same GHC version as the project."
         ]
 

stack-ghc-lib.yaml

@@ -13,7 +13,7 @@ extra-deps:
 - regex-base-0.94.0.0
 - regex-tdfa-1.3.1.0
 - haddock-library-1.8.0
-- ghc-check-0.1.0.3
+- ghc-check-0.3.0.1
 nix:
   packages: [zlib]
 flags:

stack.yaml

@@ -14,6 +14,6 @@ extra-deps:
 - parser-combinators-1.2.1
 - haddock-library-1.8.0
 - tasty-rerun-1.1.17
-- ghc-check-0.1.0.3
+- ghc-check-0.3.0.1
 nix:
   packages: [zlib]

stack84.yaml

@@ -22,8 +22,7 @@ extra-deps:
 - unordered-containers-0.2.10.0
 - file-embed-0.0.11.2
 - heaps-0.3.6.1
-- ghc-check-0.1.0.3
-
+- ghc-check-0.3.0.1
 # For tasty-retun
 - ansi-terminal-0.10.3
 - ansi-wl-pprint-0.6.9

stack88.yaml

@@ -5,7 +5,6 @@ extra-deps:
 - haskell-lsp-0.21.0.0
 - haskell-lsp-types-0.21.0.0
 - lsp-test-0.10.2.0
-- ghc-check-0.1.0.3
-
+- ghc-check-0.3.0.1
 nix:
   packages: [zlib]