Hi Erik, 

Sorry these updates have take a while to make but here is there latest diff for 
my proposed changes to make/Main.gmk to allow extension/override points in 
that make file to enable someone to provide an alternate JVM.

Please could you take another look at these and let me know if they are OK. 
If so, would you be able to get these proposed and committed.

diff -r b2f2bdba0472 make/Main.gmk
--- a/make/Main.gmk     Fri Jan 26 11:27:53 2018 -0800
+++ b/make/Main.gmk     Wed Feb 14 14:37:15 2018 +0000
@@ -56,6 +56,9 @@
 # All modules for the current target platform.
 ALL_MODULES := $(call FindAllModules)
 
+# If not already set, set the JVM variant target so that the JVM will be built.
+JVM_VARIANT_TARGETS ?= hotspot-$(JVM_VARIANT_MAIN)-libs
+
 
################################################################################
 
################################################################################
 #
@@ -645,7 +648,7 @@
   generate-exported-symbols: java.base-libs jdk.jdwp.agent-libs
 
   # Building one JVM variant is enough to start building the other libs
-  $(LIBS_TARGETS): hotspot-$(JVM_VARIANT_MAIN)-libs
+  $(LIBS_TARGETS): $(JVM_VARIANT_TARGETS)
 
   $(LAUNCHER_TARGETS): java.base-libs
 
@@ -722,8 +725,11 @@
     java.base-jmod: jrtfs-jar $(filter-out java.base-jmod, $(JMOD_TARGETS))
   endif
 
-  # Building java.base-jmod requires all of hotspot to be built.
-  java.base-jmod: hotspot
+  # If not already set, set the JVM target so that the JVM will be built.
+  JVM_MAIN_TARGETS ?= hotspot
+   
+  # Building java.base-jmod requires all of VM (ie hotspot) to be built.
+  java.base-jmod: $(JVM_MAIN_TARGETS) 
 
   # Declare dependencies from <module>-jmod to all other module targets
   # When creating a BUILDJDK, the java compilation has already been done by the
@@ -749,7 +755,7 @@
   # in java.base-copy) and tzdb.dat (done in java.base-gendata) to the
   # appropriate location otherwise jimage, jlink and jmod won't start. This
   # also applies when creating the buildjdk.
-  DEFAULT_JMOD_DEPS := java.base-libs java.base-copy java.base-gendata \
+  DEFAULT_JMOD_DEPS += java.base-libs java.base-copy java.base-gendata \
       jdk.jlink-launchers
   # When cross compiling and buildjdk is to be created, depend on creating the
   # buildjdk instead of the default dependencies.
@@ -824,9 +830,11 @@
   docs-javase-api-modulegraph: exploded-image buildtools-modules
 
   docs-reference-api-modulegraph: exploded-image buildtools-modules
-
+  # If not already set, then set the JVM specific docs targets
+  JVM_DOCS_TARGETS ?= hotspot-$(JVM_VARIANT_MAIN)-gensrc
+  
   # The gensrc steps for hotspot and jdk.jdi create html spec files.
-  docs-jdk-specs: hotspot-$(JVM_VARIANT_MAIN)-gensrc jdk.jdi-gensrc \
+  docs-jdk-specs: $(JVM_DOCS_TARGETS) jdk.jdi-gensrc \
       docs-jdk-index
 
   docs-jdk-index: exploded-image buildtools-modules
@@ -893,8 +901,10 @@
 
################################################################################
 # Virtual targets without recipes
 
+# If not already set, set the JVM specific tools targets
+JVM_TOOLS_TARGETS ?= buildtools-hotspot
 buildtools: buildtools-langtools interim-langtools interim-rmic \
-    buildtools-jdk buildtools-hotspot
+    buildtools-jdk $(JVM_TOOLS_TARGETS)
 
 hotspot: $(HOTSPOT_VARIANT_TARGETS) hotspot-jsig
 
@@ -936,8 +946,11 @@
 $(foreach m, $(LAUNCHER_MODULES), $(eval $m: $m-launchers))
 $(foreach m, $(ALL_COPY_MODULES), $(eval $m: $m-copy))
 
+# If not already set, set the JVM specific build targets
+JVM_BUILD_TARGETS ?= hotspot
+
 # Building java.base includes building all of hotspot.
-java.base: hotspot
+java.base: $(JVM_BUILD_TARGETS)
 
 demos: demos-jdk
 
@@ -1004,10 +1017,15 @@
 # This target builds the documentation image
 docs-image: docs-jdk
 
+# If not already set, set the JVM specific targets to built the test image
+JVM_TEST_IMAGE_TARGETS ?= test-image-hotspot-jtreg-native 
test-image-hotspot-gtest
+
 # This target builds the test image
-test-image: prepare-test-image test-image-hotspot-jtreg-native \
-    test-image-jdk-jtreg-native test-image-failure-handler 
test-image-hotspot-gtest \
-    test-image-demos-jdk
+test-image: prepare-test-image \
+    test-image-jdk-jtreg-native test-image-failure-handler \
+    test-image-demos-jdk $(JVM_TEST_IMAGE_TARGETS)
+
+################################################################################
 
 # all-images builds all our deliverables as images.
 all-images: product-images test-image docs-image
@@ -1146,7 +1164,10 @@
              $(MAKESUPPORT_OUTPUTDIR)/main-targets.gmk
 
 
################################################################################
+# Hook to include the corresponding custom file, if present.
+$(eval $(call IncludeCustomExtension, Main-post.gmk))
 
 .PHONY: $(ALL_TARGETS)
 
 FRC: # Force target
+ 

 
Thanks
Steve Groeger
Java Runtimes Development
IBM Hursley
IBM United Kingdom Ltd
Tel: (44) 1962 816911 Mobex: 279990 Mobile: 07718 517 129
Fax (44) 1962 816800
Lotus Notes: Steve Groeger/UK/IBM
Internet: groe...@uk.ibm.com
 
Unless stated otherwise above:
IBM United Kingdom Limited - Registered in England and Wales with number 741598.
Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU
Unless stated otherwise above:
IBM United Kingdom Limited - Registered in England and Wales with number 
741598. 
Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU

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