--- a/make/Main.gmk	Tue Feb 12 14:08:07 2019 -0800
+++ b/make/Main.gmk	Tue Feb 12 08:40:43 2019 +0100
@@ -766,6 +766,8 @@
   $(foreach m, $(GENSRC_MODULES), $(eval $m-libs-compile-commands: $m-gensrc))
   $(foreach m, $(filter $(JAVA_MODULES), $(LIBS_MODULES)), $(eval $m-libs-compile-commands: $m-java))
 
+  $(COMPILE_COMMANDS_TARGETS_HOTSPOT): clean-compile-commands
+  $(COMPILE_COMMANDS_TARGETS_JDK): clean-compile-commands
   compile-commands-hotspot: $(COMPILE_COMMANDS_TARGETS_HOTSPOT)
   compile-commands: $(COMPILE_COMMANDS_TARGETS_HOTSPOT) $(COMPILE_COMMANDS_TARGETS_JDK)
 
@@ -1139,6 +1141,9 @@
 clean-docs:
 	$(call CleanDocs)
 
+clean-compile-commands:
+	$(call CleanMakeSupportDir,compile-commands)
+
 $(CLEAN_DIR_TARGETS):
 	$(call CleanDir,$(patsubst clean-%, %, $@))
 
@@ -1181,9 +1186,9 @@
 	)
 	$(ECHO) Cleaned everything, you will have to re-run configure.
 
-ALL_TARGETS += clean clean-docs dist-clean $(CLEAN_DIR_TARGETS) $(CLEAN_SUPPORT_DIR_TARGETS) \
-    $(CLEAN_TEST_TARGETS) $(CLEAN_PHASE_TARGETS) $(CLEAN_MODULE_TARGETS) \
-    $(CLEAN_MODULE_PHASE_TARGETS)
+ALL_TARGETS += clean clean-docs clean-compile-commands dist-clean $(CLEAN_DIR_TARGETS) \
+    $(CLEAN_SUPPORT_DIR_TARGETS) $(CLEAN_TEST_TARGETS) $(CLEAN_PHASE_TARGETS) \
+    $(CLEAN_MODULE_TARGETS) $(CLEAN_MODULE_PHASE_TARGETS)
 
 ################################################################################
 # Declare *-only targets for each normal target

--- a/make/MainSupport.gmk	Tue Feb 12 14:08:07 2019 -0800
+++ b/make/MainSupport.gmk	Tue Feb 12 08:40:43 2019 +0100
@@ -54,6 +54,13 @@
 	@$(PRINTF) " done\n"
 endef
 
+define CleanMakeSupportDir
+	@$(PRINTF) "Cleaning $(strip $1) make support artifacts ..."
+	@$(PRINTF) "\n" $(LOG_DEBUG)
+	$(RM) -r $(MAKESUPPORT_OUTPUTDIR)/$(strip $1)
+	@$(PRINTF) " done\n"
+endef
+
 define CleanTest
 	@$(PRINTF) "Cleaning test $(strip $1) ..."
 	@$(PRINTF) "\n" $(LOG_DEBUG)