Merge pull request #57 from xmonad/prof-flag

only turn on -prof -auto-all with profiling flag

xmonad.cabal

@@ -50,6 +50,11 @@ flag generatemanpage
     default: False
     manual: True
 
+flag profiling
+     description: Enable profiling
+     default: False
+     manual: True
+
 library
     hs-source-dirs:     src
     exposed-modules:    XMonad
@@ -85,7 +90,8 @@ library
         -- needed for XMonad.Config's instance Default (XConfig a)
 
 
-    ghc-prof-options:   -prof -auto-all
+    if flag(profiling)
+        ghc-prof-options:   -prof -auto-all
 
     if flag(testing)
         buildable: False