ghc -O2 generates too large C files for unregisterised compiler.
On ia64 it causes DynFlags to compile for 60 minutes (then assembler
crashes).

To decrease C code inflation we don't use -O2 in UNREG mode.
diff --git a/mk/config.mk.in b/mk/config.mk.in
index bfaaa66..d8f93b3 100644
--- a/mk/config.mk.in
+++ b/mk/config.mk.in
@@ -72,11 +72,2 @@ GhcStage3HcOpts=-O2

-# Disable -O2 optimization. Otherwise amount of generated C code
-# makes things very slow to compile (~5 minutes on core-i7 for 'compiler/hsSyn/HsExpr.lhs')
-# and sometimes not compile at all (powerpc64 overflows something
-# on 'compiler/hsSyn/HsExpr.lhs').
-ifeq "$(GhcUnregisterised)" "YES"
-GhcStage1HcOpts=
-GhcStage2HcOpts=
-GhcStage3HcOpts=
-endif

@@ -894 +885,13 @@ CURSES_INCLUDE_DIRS = @CURSES_INCLUDE_DIRS@
 CURSES_LIB_DIRS = @CURSES_LIB_DIRS@
+
+# Disable -O2 optimization. Otherwise amount of generated C code
+# makes things very slow to compile (~5 minutes on core-i7 for 'compiler/hsSyn/HsExpr.lhs')
+# and sometimes not compile at all (powerpc64 overflows something
+# on 'compiler/hsSyn/HsExpr.lhs').
+ifeq "$(GhcUnregisterised)" "YES"
+GhcStage1HcOpts=
+GhcStage2HcOpts=
+GhcStage3HcOpts=
+
+GhcLibHcOpts=
+endif