--- old/make/CompileInterimLangtools.gmk	2017-12-05 00:41:33.064117709 +0100
+++ new/make/CompileInterimLangtools.gmk	2017-12-05 00:41:32.800108473 +0100
@@ -69,8 +69,8 @@
           Standard.java, \
       EXTRA_FILES := $(BUILDTOOLS_OUTPUTDIR)/gensrc/$1.interim/module-info.java, \
       COPY := .gif .png .xml .css .js javax.tools.JavaCompilerTool, \
-      BIN := $(BUILDTOOLS_OUTPUTDIR)/interim_modules/$1.interim, \
-      ADD_JAVAC_FLAGS := --module-path $(BUILDTOOLS_OUTPUTDIR)/interim_modules \
+      BIN := $(BUILDTOOLS_OUTPUTDIR)/interim_langtools_modules/$1.interim, \
+      ADD_JAVAC_FLAGS := --module-path $(BUILDTOOLS_OUTPUTDIR)/interim_langtools_modules \
           $$(INTERIM_LANGTOOLS_ADD_EXPORTS) \
           -Xlint:-module, \
   ))
--- old/make/CompileInterimRmic.gmk	2017-12-05 00:41:33.724140798 +0100
+++ new/make/CompileInterimRmic.gmk	2017-12-05 00:41:33.464131702 +0100
@@ -65,10 +65,10 @@
     EXCLUDE_FILES := $(TOPDIR)/src/jdk.rmic/share/classes/module-info.java, \
     EXTRA_FILES := $(BUILDTOOLS_OUTPUTDIR)/gensrc/jdk.rmic.interim/module-info.java, \
     INCLUDES := $(RMIC_PKGS), \
-    BIN := $(BUILDTOOLS_OUTPUTDIR)/interim_modules/jdk.rmic.interim, \
+    BIN := $(BUILDTOOLS_OUTPUTDIR)/interim_rmic_modules/jdk.rmic.interim, \
     COPY := .properties, \
     ADD_JAVAC_FLAGS := \
-        --module-path $(BUILDTOOLS_OUTPUTDIR)/interim_modules \
+        --module-path $(BUILDTOOLS_OUTPUTDIR)/interim_rmic_modules \
         --add-modules java.corba \
         --add-exports java.corba/com.sun.corba.se.impl.util=jdk.rmic.interim \
         $(INTERIM_RMIC_ADD_EXPORTS), \
--- old/make/autoconf/spec.gmk.in	2017-12-05 00:41:34.392164166 +0100
+++ new/make/autoconf/spec.gmk.in	2017-12-05 00:41:34.120154651 +0100
@@ -576,7 +576,7 @@
 INTERIM_LANGTOOLS_ARGS := \
     --limit-modules java.base,jdk.zipfs,$(INTERIM_LANGTOOLS_MODULES_COMMA) \
     --add-modules $(INTERIM_LANGTOOLS_MODULES_COMMA) \
-    --module-path $(BUILDTOOLS_OUTPUTDIR)/interim_modules \
+    --module-path $(BUILDTOOLS_OUTPUTDIR)/interim_langtools_modules \
     $(INTERIM_LANGTOOLS_ADD_EXPORTS) \
     #
 JAVAC_MAIN_CLASS = -m jdk.compiler.interim/com.sun.tools.javac.Main
@@ -587,8 +587,10 @@
 INTERIM_RMIC_ADD_EXPORTS := \
     --add-exports java.corba/com.sun.corba.se.impl.util=jdk.rmic.interim \
     #
-INTERIM_RMIC_ARGS := --limit-modules java.base,jdk.compiler,jdk.javadoc,java.corba \
-    --module-path $(BUILDTOOLS_OUTPUTDIR)/interim_modules \
+# Use = to delay expansion of PathList since it's not available in this file.
+INTERIM_RMIC_ARGS = --limit-modules java.base,jdk.compiler,jdk.javadoc,java.corba \
+    --module-path $(call PathList, $(BUILDTOOLS_OUTPUTDIR)/interim_rmic_modules \
+        $(BUILDTOOLS_OUTPUTDIR)/interim_langtools_modules) \
     $(INTERIM_RMIC_ADD_EXPORTS) \
     #