generate the main expression if not in the library mode

gibbon-compiler/src/Gibbon/Common.hs

@@ -22,6 +22,7 @@ module Gibbon.Common
          -- * Gibbon configuration
        , Config(..), Input(..), Mode(..), Backend(..), defaultConfig
        , RunConfig(..), getRunConfig, defaultRunConfig, getGibbonConfig
+       , isBench, isLibrary
 
          -- * Misc helpers
        , SSModality(..), (#), (!!!), fragileZip, fragileZip', sdoc, ndoc, abbrv
@@ -255,6 +256,14 @@ data Mode = ToParse  -- ^ Parse and then stop
           | Library Var -- ^ Compile as a library, with its main entry point given.
   deriving (Show, Read, Eq, Ord)
 
+isBench :: Mode -> Bool
+isBench (Bench _) = True
+isBench _ = False
+
+isLibrary :: Mode -> Bool
+isLibrary (Library _) = True
+isLibrary _ = False
+
 -- | Compilation backend used
 data Backend = C | LLVM
   deriving (Show,Read,Eq,Ord)

gibbon-compiler/src/Gibbon/Compiler.hs

@@ -542,15 +542,6 @@ compilationCmd C config = (cc config) ++" -std=gnu11 "
         simpleWriteBarrier = gopt Opt_SimpleWriteBarrier dflags
         lazyPromote = gopt Opt_NoEagerPromote dflags
 
--- |
-isBench :: Mode -> Bool
-isBench (Bench _) = True
-isBench _ = False
-
-isLibrary :: Mode -> Bool
-isLibrary (Library _) = True
-isLibrary _ = False
-
 -- | The debug level at which we start to call the interpreter on the program during compilation.
 interpDbgLevel :: Int
 interpDbgLevel = 5

gibbon-compiler/src/Gibbon/Passes/Codegen.hs

@@ -189,7 +189,7 @@ sortFns (Prog _ _ funs mtal) = foldl go S.empty allTails
 -- | Compile a program to C code that has the side effect of the
 -- "gibbon_main" expression in that program.
 codegenProg :: Config -> Prog -> IO String
-codegenProg cfg prg@(Prog info_tbl sym_tbl funs mtal) =
+codegenProg cfg@Config{mode} prg@(Prog info_tbl sym_tbl funs mtal) =
       return (hashIncludes ++ pretty 80 (stack (map ppr defs)))
     where
       init_fun_env = foldr (\fn acc -> M.insert (funName fn) (map snd (funArgs fn), funRetTy fn) acc) M.empty funs
@@ -200,9 +200,11 @@ codegenProg cfg prg@(Prog info_tbl sym_tbl funs mtal) =
         (prots,funs') <- (unzip . concat) <$> mapM codegenFun funs
         main_expr' <- main_expr
         let struct_tys = uniqueDicts $ S.toList $ harvestStructTys prg
-        return ((L.nub $ makeStructs struct_tys) ++ prots ++
+        return ((L.nub $ makeStructs struct_tys) ++
+                prots ++
                 [gibTypesEnum, initInfoTable info_tbl, initSymTable sym_tbl] ++
-                funs' -- ++ [main_expr']
+                funs' ++
+                if isLibrary mode then [] else [main_expr']
                )
 
       main_expr :: PassM C.Definition