+ghci/ByteCodeLink_HC_OPTS = -fvia-C -monly-3-regs
+
+# 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.
+compMan/CompManager_HC_OPTS = -fno-cse
+ghci/InteractiveUI_HC_OPTS = -fno-cse
+main/CmdLineOpts_HC_OPTS = -fno-cse
+main/DriverFlags_HC_OPTS = -fno-cse
+main/DriverMkDepend_HC_OPTS = -fno-cse
+main/DriverPipeline_HC_OPTS = -fno-cse
+main/DriverState_HC_OPTS = -fno-cse
+main/DriverUtil_HC_OPTS = -fno-cse
+main/Finder_HC_OPTS = -fno-cse
+main/SysTools_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
+ifeq "$(HOSTPLATFORM)" "i386-unknown-mingw32"
+main/SysTools_HC_OPTS += '-\#include <windows.h>' '-\#include <process.h>'
+endif