Use fusion-pugin and optimization options for the lib and exe

Author: harendra-kumar

streamly-coreutils.cabal

@@ -36,6 +36,11 @@ extra-doc-files:
   , design/proposal.md
   , design/design-notes.md
 
+flag fusion-plugin
+  description: Use fusion plugin for best performance
+  manual: True
+  default: True
+
 common compile-options
     default-language: Haskell2010
 
@@ -98,8 +103,47 @@ common default-extensions
         -- UndecidableInstances -- Does not show any perf impact
         -- UnboxedTuples        -- interferes with (#.)
 
+common exe-dependencies
+  build-depends:
+      base
+    , optparse-applicative >= 0.17 && < 0.19
+    , streamly
+    , streamly-core
+    , streamly-coreutils
+
+common perf-options
+  ghc-options: -O2
+               -fdicts-strict
+               -fspec-constr-recursive=16
+               -fmax-worker-args=16
+               -Wall
+               -Wcompat
+               -Wunrecognised-warning-flags
+               -Widentities
+               -Wincomplete-record-updates
+               -Wincomplete-uni-patterns
+               -Wredundant-constraints
+               -Wnoncanonical-monad-instances
+  if impl(ghc >= 9.8)
+    ghc-options: -Wno-x-partial
+
+  if flag(fusion-plugin)
+    ghc-options: -fplugin Fusion.Plugin
+    build-depends:
+        fusion-plugin >= 0.2.6 && < 0.3
+
+common exe-options
+  import: exe-dependencies, perf-options
+  default-language: Haskell2010
+  hs-source-dirs: app
+
+common exe-options-threaded
+  import: exe-options
+  ghc-options: -threaded
+               -with-rtsopts=-N
+
 library
-  import: compile-options, default-extensions
+  import: compile-options, default-extensions, perf-options
   build-depends:
       base >= 4.8 && < 5
     , directory >= 1.2.2 && < 1.4
@@ -155,16 +199,8 @@ library
   default-language:    Haskell2010
 
 executable hfd
-  import: compile-options, default-extensions
+  import: compile-options, default-extensions, exe-options-threaded
   main-is: hfd.hs
-  hs-source-dirs: app
-  build-depends:
-      base
-    , optparse-applicative >= 0.17 && < 0.19
-    , streamly
-    , streamly-core
-    , streamly-coreutils
-  default-language: Haskell2010
 
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 -- Benchmarks