diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index eaf599dc2137..7442dfb73b7f 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -116,8 +116,15 @@ ifdef INSTALL_PATH
 
 	@# Ask all targets to emit their test scripts
 	echo "#!/bin/sh" > $(ALL_SCRIPT)
-	echo "cd \$$(dirname \$$0)" >> $(ALL_SCRIPT)
+	echo "BASE_DIR=\$$(realpath \$$(dirname \$$0))" >> $(ALL_SCRIPT)
+	echo "cd \$$BASE_DIR" >> $(ALL_SCRIPT)
 	echo "ROOT=\$$PWD" >> $(ALL_SCRIPT)
+	echo "if [ \"\$$1\" = \"--summary\" ]; then" >> $(ALL_SCRIPT)
+	echo "  OUTPUT=\$$BASE_DIR/output.log" >> $(ALL_SCRIPT)
+	echo "  cat /dev/null > \$$OUTPUT" >> $(ALL_SCRIPT)
+	echo "else" >> $(ALL_SCRIPT)
+	echo "  OUTPUT=/dev/stdout" >> $(ALL_SCRIPT)
+	echo "fi" >> $(ALL_SCRIPT)
 
 	for TARGET in $(TARGETS); do \
 		BUILD_TARGET=$$BUILD/$$TARGET;	\
diff --git a/tools/testing/selftests/lib.mk b/tools/testing/selftests/lib.mk
index 5bef05d6ba39..7de482a0519d 100644
--- a/tools/testing/selftests/lib.mk
+++ b/tools/testing/selftests/lib.mk
@@ -77,7 +77,7 @@ endif
 define EMIT_TESTS
 	@for TEST in $(TEST_GEN_PROGS) $(TEST_CUSTOM_PROGS) $(TEST_PROGS); do \
 		BASENAME_TEST=`basename $$TEST`;	\
-		echo "(./$$BASENAME_TEST > /tmp/$$BASENAME_TEST 2>&1 && echo \"selftests: $$BASENAME_TEST [PASS]\") || echo \"selftests: $$BASENAME_TEST [FAIL]\""; \
+		echo "(./$$BASENAME_TEST >> \$$OUTPUT 2>&1 && echo \"selftests: $$BASENAME_TEST [PASS]\") || echo \"selftests: $$BASENAME_TEST [FAIL]\""; \
 	done;
 endef