adding profile and threads flags

Author: GuillaumedeVolpiano

random-build.cabal

@@ -42,6 +42,16 @@ flag pedantic
   default:     False
   manual:      True
 
+flag threads
+  description: Enable threading and rtsopts
+  default: True
+  manual: True
+
+flag profile
+  description: Enable profiling flags
+  default: False
+  manual: True
+
 common warnings
   ghc-options: -Wall
 
@@ -118,4 +128,7 @@ executable random-build
 
   hs-source-dirs:   app
   default-language: Haskell2010
-  ghc-options:      -threaded
+  if flag(threads)
+    ghc-options:      -threaded -rtsopts -with-rtsopts=N
+  if flag(profile)
+    ghc-options: -prof-cafs -prof-auto -rtsopts