44 lines
1.4 KiB
Diff
44 lines
1.4 KiB
Diff
diff -Naur ghc-paths-0.1.0.9/GHC/Paths.hs ghc-paths-0.1.0.9-new/GHC/Paths.hs
|
|
--- ghc-paths-0.1.0.9/GHC/Paths.hs 2012-12-16 13:53:45.720148396 +0100
|
|
+++ ghc-paths-0.1.0.9-new/GHC/Paths.hs 2012-12-16 17:22:12.765576568 +0100
|
|
@@ -1,13 +1,35 @@
|
|
{-# LANGUAGE CPP #-}
|
|
+{-# LANGUAGE ScopedTypeVariables #-}
|
|
|
|
module GHC.Paths (
|
|
ghc, ghc_pkg, libdir, docdir
|
|
) where
|
|
|
|
+import Control.Exception as E
|
|
+import Data.Maybe
|
|
+import System.Environment
|
|
+import System.IO.Unsafe
|
|
+
|
|
+-- Yes, there's lookupEnv now, but we want to be compatible
|
|
+-- with older GHCs.
|
|
+checkEnv :: String -> IO (Maybe String)
|
|
+checkEnv var = E.catch (fmap Just (getEnv var))
|
|
+ (\ (e :: IOException) -> return Nothing)
|
|
+
|
|
+nixLibdir, nixDocdir, nixGhc, nixGhcPkg :: Maybe FilePath
|
|
+nixLibdir = unsafePerformIO (checkEnv "NIX_GHC_LIBDIR")
|
|
+nixDocdir = unsafePerformIO (checkEnv "NIX_GHC_DOCDIR")
|
|
+nixGhc = unsafePerformIO (checkEnv "NIX_GHC")
|
|
+nixGhcPkg = unsafePerformIO (checkEnv "NIX_GHCPKG")
|
|
+{-# NOINLINE nixLibdir #-}
|
|
+{-# NOINLINE nixDocdir #-}
|
|
+{-# NOINLINE nixGhc #-}
|
|
+{-# NOINLINE nixGhcPkg #-}
|
|
+
|
|
libdir, docdir, ghc, ghc_pkg :: FilePath
|
|
|
|
-libdir = GHC_PATHS_LIBDIR
|
|
-docdir = GHC_PATHS_DOCDIR
|
|
+libdir = fromMaybe GHC_PATHS_LIBDIR nixLibdir
|
|
+docdir = fromMaybe GHC_PATHS_DOCDIR nixDocdir
|
|
|
|
-ghc = GHC_PATHS_GHC
|
|
-ghc_pkg = GHC_PATHS_GHC_PKG
|
|
+ghc = fromMaybe GHC_PATHS_GHC nixGhc
|
|
+ghc_pkg = fromMaybe GHC_PATHS_GHC_PKG nixGhcPkg
|