+setTmpDir dir = writeIORef v_TmpDir (canonicalise dir)
+ where
+#if !defined(mingw32_HOST_OS)
+ canonicalise p = normalisePath p
+#else
+ -- Canonicalisation of temp path under win32 is a bit more
+ -- involved: (a) strip trailing slash,
+ -- (b) normalise slashes
+ -- (c) just in case, if there is a prefix /cygdrive/x/, change to x:
+ --
+ canonicalise path = normalisePath (xltCygdrive (removeTrailingSlash path))
+
+ -- if we're operating under cygwin, and TMP/TEMP is of
+ -- the form "/cygdrive/drive/path", translate this to
+ -- "drive:/path" (as GHC isn't a cygwin app and doesn't
+ -- understand /cygdrive paths.)
+ xltCygdrive path
+ | "/cygdrive/" `isPrefixOf` path =
+ case drop (length "/cygdrive/") path of
+ drive:xs@('/':_) -> drive:':':xs
+ _ -> path
+ | otherwise = path
+
+ -- strip the trailing backslash (awful, but we only do this once).
+ removeTrailingSlash path =
+ case last path of
+ '/' -> init path
+ '\\' -> init path
+ _ -> path
+#endif