Move -fno-cse flags from Makefile into pragmas

These are needed for GLOBAL_VAR's to work properly

compiler/Makefile

@@ -576,18 +576,6 @@ endif
 #simplCore/SimplEnv_HC_OPTS = -auto-all
 #simplCore/SimplUtils_HC_OPTS = -auto-all
 
-# CSE interacts badly with top-level IORefs (reportedly in DriverState and
-# DriverMkDepend), causing some of them to be commoned up.  We have a fix for
-# this in 5.00+, but earlier versions of the compiler will need CSE turned off.
-# To be on the safe side, we disable CSE in *all* modules with top-level IORefs.
-ghci/InteractiveUI_HC_OPTS	= -fno-cse
-main/CmdLineOpts_HC_OPTS	= -fno-cse
-main/DriverMkDepend_HC_OPTS	= -fno-cse
-main/DriverPipeline_HC_OPTS	= -fno-cse
-main/Finder_HC_OPTS		= -fno-cse
-main/SysTools_HC_OPTS		= -fno-cse
-main/StaticFlags_HC_OPTS	= -fno-cse
-
 # The #include is vital for the via-C route, else the C
 # compiler doesn't realise that the stcall foreign imports are indeed
 # stdcall, and doesn't generate the Foo@8 name for them

compiler/ghci/GhciMonad.hs

+{-# OPTIONS -fno-cse #-}
+-- -fno-cse is needed for GLOBAL_VAR's to behave properly
+
 -----------------------------------------------------------------------------
 --
 -- Monadery code used in InteractiveUI

compiler/ghci/InteractiveUI.hs

+{-# OPTIONS -fno-cse #-}
+-- -fno-cse is needed for GLOBAL_VAR's to behave properly
+
 {-# OPTIONS -#include "Linker.h" #-}
 -----------------------------------------------------------------------------
 --

compiler/ghci/Linker.lhs

@@ -14,6 +14,9 @@ necessary.
 \begin{code}
 {-# OPTIONS -optc-DNON_POSIX_SOURCE -#include "Linker.h" #-}
 
+{-# OPTIONS -fno-cse #-}
+-- -fno-cse is needed for GLOBAL_VAR's to behave properly
+
 module Linker ( HValue, getHValue, showLinkerState,
 		linkExpr, unload, withExtendedLinkEnv,
                 extendLinkEnv, deleteFromLinkEnv,

compiler/main/DriverMkDepend.hs

+{-# OPTIONS -fno-cse #-}
+-- -fno-cse is needed for GLOBAL_VAR's to behave properly
 
 -----------------------------------------------------------------------------
 --

compiler/main/DriverPipeline.hs

+{-# OPTIONS -fno-cse #-}
+-- -fno-cse is needed for GLOBAL_VAR's to behave properly
+
 -----------------------------------------------------------------------------
 --
 -- GHC Driver

compiler/main/StaticFlags.hs

+{-# OPTIONS -fno-cse #-}
+-- -fno-cse is needed for GLOBAL_VAR's to behave properly
+
 -----------------------------------------------------------------------------
 --
 -- Static flags

compiler/main/SysTools.lhs

@@ -7,6 +7,9 @@
 -----------------------------------------------------------------------------
 
 \begin{code}
+{-# OPTIONS -fno-cse #-}
+-- -fno-cse is needed for GLOBAL_VAR's to behave properly
+
 module SysTools (
         -- Initialisation
         initSysTools,