diff -r 000000000000 -r 6474c204b198 build/pymake/tests/doublecolon-priordeps.mk
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/build/pymake/tests/doublecolon-priordeps.mk	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,19 @@
+#T commandline: ['-j3']
+
+# All *prior* dependencies of a doublecolon rule must be satisfied before
+# subsequent commands are run.
+
+all:: target1
+
+all:: target2
+	test -f target1
+	@echo TEST-PASS
+
+target1:
+	touch starting-$@
+	sleep 1
+	touch $@
+
+target2:
+	sleep 0.1
+	test -f starting-target1