--- a/test/make/TestMake.gmk	Thu Jun 20 23:12:12 2019 -0700
+++ b/test/make/TestMake.gmk	Fri Jun 21 06:33:55 2019 -0700
@@ -46,7 +46,8 @@
 
 all: $(TARGETS)
 
+# Prints targets to TARGETS_FILE which must be set when calling this target.
 print-targets:
-	$(ECHO) "$(TARGETS)"
+	$(ECHO) "$(TARGETS)" >> $(TARGETS_FILE)
 
 .PHONY: default all $(TARGETS)