hpc: use `takeDirectory` instead of `dropWhileEnd (/= '/')`

This fixes some hpc tests on Windows. Update submodule hpc.

2 files changed, 1 insertions, 4 deletions

diff --git a/libraries/hpc b/libraries/hpc
-Subproject da5928ccf4e369f6985ef291351d074918b8801
+Subproject 315b78ac8fe7b42912d2146783b0366f6b0e950
diff --git a/utils/hpc/HpcMarkup.hs b/utils/hpc/HpcMarkup.hs
index 31327fc991..fb68eacef7 100644
--- a/utils/hpc/HpcMarkup.hs
+++ b/utils/hpc/HpcMarkup.hs
@@ -479,15 +479,12 @@ instance Monoid ModuleSummary where
 
 writeFileUsing :: String -> String -> IO ()
 writeFileUsing filename text = do
-  let dest_dir = dropWhileEndLE (\ x -> x /= '/') $ filename
-
 -- We need to check for the dest_dir each time, because we use sub-dirs for
 -- packages, and a single .tix file might contain information about
 -- many package.
 
   -- create the dest_dir if needed
-  when (not (null dest_dir)) $
-    createDirectoryIfMissing True dest_dir
+  createDirectoryIfMissing True (takeDirectory filename)
 
   writeFile filename text