--- a/hotspot/make/solaris/makefiles/vm.make	Fri Feb 03 17:21:52 2012 -0500
+++ b/hotspot/make/solaris/makefiles/vm.make	Tue Jan 31 13:12:39 2012 +0100
@@ -83,9 +83,13 @@
   ${BUILD_TARGET}    \
   ${BUILD_USER}      \
   ${HS_LIB_ARCH}     \
-  ${JRE_VERSION}     \
   ${VM_DISTRO}
 
+# This is VERY important! The version define must only be supplied to vm_version.o
+# If not, ccache will not re-use the cache at all, since the version string might contain
+# a time and date. 
+vm_version.o: CPPFLAGS += ${JRE_VERSION} 
+
 # CFLAGS_WARN holds compiler options to suppress/enable warnings.
 CFLAGS += $(CFLAGS_WARN)