add buildflags for dynamic executables

Stackage/CompleteBuild.hs

@@ -41,6 +41,7 @@ data BuildFlags = BuildFlags
     , bfEnableHaddock    :: !Bool
     , bfDoUpload         :: !Bool
     , bfEnableLibProfile :: !Bool
+    , bfEnableExecDyn    :: !Bool
     , bfVerbose          :: !Bool
     , bfSkipCheck        :: !Bool
     , bfGhcOptions       :: !String

app/stackage.hs

@@ -91,6 +91,9 @@ main =
         switch
             (long "enable-library-profiling" <>
              help "Enable profiling when building") <*>
+        switch
+            (long "enable-executable-dynamic" <>
+             help "Enable dynamic executables when building") <*>
         switch
             (long "verbose" <> short 'v' <>
              help "Output verbose detail about the build steps") <*>

test/Stackage/BuildPlanSpec.hs

@@ -92,6 +92,7 @@ basicBuild getPlans _ = do
                 { bfEnableTests      = False
                 , bfDoUpload         = False
                 , bfEnableLibProfile = False
+                , bfEnableExecDyn    = False
                 , bfVerbose          = False
                 }
 
@@ -117,6 +118,7 @@ shakeBuild getPlans _ = do
               BuildFlags {bfEnableTests = False
                          ,bfDoUpload = False
                          ,bfEnableLibProfile = False
+                         ,bfEnableExecDyn = False
                          ,bfVerbose = False}
 
 -- | Check build plan with the given package set getter.