Make `-Wall` clean and drop `-fno-warn-unused-imports`

CPP conditional code sections have been carefully taken into account
while performing this warning cleanup. Most `OPTIONS_GHC` declarations
could be dropped (now only a lonely `{-# OPTIONS_GHC -fno-cse #-}`
remains in `Posix.Signals`).

Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/unix.cabal b/unix.cabal
index f39d46f..835bf1c 100644
--- a/unix.cabal
+++ b/unix.cabal
@@ -117,6 +117,8 @@ library
         System.Posix.Process.Common
         System.Posix.Terminal.Common
 
+    ghc-options: -Wall
+
     include-dirs: 	include
     includes:       HsUnix.h execvpe.h
     install-includes: