--- a/langtools/make/gendata/Gendata-jdk.compiler.gmk	Wed Jul 12 18:54:07 2017 -0700
+++ b/langtools/make/gendata/Gendata-jdk.compiler.gmk	Thu Jul 13 08:49:11 2017 +0200
@@ -60,7 +60,8 @@
 
 $(SUPPORT_OUTPUTDIR)/symbols/ct.sym-files/_the.symbols: \
     $(COMPILE_CREATE_SYMBOLS) \
-    $(wildcard $(LANGTOOLS_TOPDIR)/make/data/symbols/*)
+    $(wildcard $(LANGTOOLS_TOPDIR)/make/data/symbols/*) \
+    $(MODULE_INFOS)
 	$(RM) -r $(@D)
 	$(MKDIR) -p $(@D)
 	$(ECHO) Creating ct.sym classes