--- old/hotspot/make/linux/makefiles/top.make	2014-08-26 12:57:28.128604237 +0200
+++ new/hotspot/make/linux/makefiles/top.make	2014-08-26 12:57:28.012599299 +0200
@@ -69,7 +69,13 @@
 
 # Wierd argument adjustment for "gnumake -j..."
 adjust-mflags   = $(GENERATED)/adjust-mflags
-MFLAGS-adjusted = -r `$(adjust-mflags) "$(MFLAGS)" "$(HOTSPOT_BUILD_JOBS)"`
+# If SPEC is set, it's from configure and it's already controlling concurrency
+# for us. Skip setting -j with HOTSPOT_BUILD_JOBS.
+ifeq ($(SPEC), )
+  MFLAGS-adjusted = -r `$(adjust-mflags) "$(MFLAGS)" "$(HOTSPOT_BUILD_JOBS)"`
+else
+  MFLAGS-adjusted = -r $(MFLAGS)
+endif
 
 
 # default target: update lists, make vm
@@ -119,7 +125,7 @@
 	@+mv $@+ $@
 
 the_vm: vm_build_preliminaries $(adjust-mflags)
-	@$(UpdatePCH)
+	+@$(UpdatePCH)
 	@$(MAKE) -f vm.make $(MFLAGS-adjusted)
 
 install: the_vm
@@ -128,7 +134,7 @@
 # next rules support "make foo.[ois]"
 
 %.o %.i %.s:
-	$(UpdatePCH)
+	+$(UpdatePCH)
 	$(MAKE) -f vm.make $(MFLAGS) $@
 	#$(MAKE) -f vm.make $@
 
@@ -145,3 +151,5 @@
 .PHONY: default vm_build_preliminaries
 .PHONY: lists ad_stuff jvmti_stuff sa_stuff the_vm clean realclean
 .PHONY: checks check_os_version install
+
+.NOTPARALLEL: