+# Define the list of optimizations to run. This comprises the same set of
+# optimizations that opt -std-compile-opts and gccld run, in the same order.
+opt_switches=`llvm-as < /dev/null -o - | opt -std-compile-opts -disable-output -debug-pass=Arguments 2>&1 | sed 's/Pass Arguments: //'`
+all_switches="$opt_switches"
+echo "Passes : $all_switches"
+