--- old/src/cpu/zero/vm/globals_zero.hpp	2015-10-30 19:14:46.416475479 +0100
+++ new/src/cpu/zero/vm/globals_zero.hpp	2015-10-30 19:14:46.352475477 +0100
@@ -69,6 +69,9 @@
 
 define_pd_global(bool, PreserveFramePointer, false);
 
+// No performance work done here yet.
+define_pd_global(bool, CompactStrings, false);
+
 #define ARCH_FLAGS(develop, product, diagnostic, experimental, notproduct, range, constraint)  \
                                                                             \
   product(bool, UseFastEmptyMethods, true,                                  \