Add a target32Bit function to Platform

compiler/utils/Platform.hs

@@ -9,11 +9,14 @@ module Platform (
         OS(..),
 
         defaultTargetPlatform,
+        target32Bit,
         osElfTarget
 )
 
 where
 
+import Panic
+
 #include "HsVersions.h"
 
 
@@ -52,6 +55,16 @@ data OS
         deriving (Show, Eq)
 
 
+target32Bit :: Platform -> Bool
+target32Bit p = case platformArch p of
+                ArchUnknown -> panic "Don't know if ArchUnknown is 32bit"
+                ArchX86     -> True
+                ArchX86_64  -> False
+                ArchPPC     -> True
+                ArchPPC_64  -> False
+                ArchSPARC   -> True
+
+
 -- | This predicates tells us whether the OS supports ELF-like shared libraries.
 osElfTarget :: OS -> Bool
 osElfTarget OSLinux   = True