diff -r 000000000000 -r 6474c204b198 build/pymake/tests/parallel-submake.mk
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/build/pymake/tests/parallel-submake.mk	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,17 @@
+#T commandline: ['-j2']
+
+# A submake shouldn't return control to the parent until it has actually finished doing everything.
+
+all:
+	-$(MAKE) -f $(TESTPATH)/parallel-submake.mk subtarget
+	cat results
+	test "$$(cat results)" = "0123"
+	@echo TEST-PASS
+
+subtarget: succeed-slowly fail-quickly
+
+succeed-slowly:
+	printf 0 >>results; sleep 1; printf 1 >>results; sleep 1; printf 2 >>results; sleep 1; printf 3 >>results
+
+fail-quickly:
+	exit 1