mixer multirotor: add to CI

Makefile

@@ -322,9 +322,13 @@ format:
 
 # Testing
 # --------------------------------------------------------------------
-.PHONY: tests tests_coverage tests_mission tests_mission_coverage tests_offboard rostest python_coverage
+.PHONY: tests tests_coverage tests_mission tests_mission_coverage tests_offboard
+.PHONY: rostest python_coverage test_mixer_multirotor
 
-tests:
+test_mixer_multirotor:
+	@$(MAKE) -C "$(SRC_DIR)"/src/lib/mixer --no-print-directory tests
+
+tests: test_mixer_multirotor
 	@$(MAKE) --no-print-directory px4_sitl_default test_results \
 	ASAN_OPTIONS="color=always:check_initialization_order=1:detect_stack_use_after_return=1" \
 	UBSAN_OPTIONS="color=always"

src/lib/mixer/Makefile

@@ -1,9 +1,13 @@
 
-.PHONY: all tests
+.PHONY: all tests clean
 all: test_mixer_multirotor
 
 test_mixer_multirotor: test_mixer_multirotor.cpp mixer_multirotor.cpp mixer.cpp
-	g++ $^ -I .. -DMIXER_MULTIROTOR_USE_MOCK_GEOMETRY -o $@
+	@g++ $^ -std=c++11 -I .. -DMIXER_MULTIROTOR_USE_MOCK_GEOMETRY -o $@
 
 tests: test_mixer_multirotor
-	python mixer_multirotor.py --test --mixer-multirotor-binary ./$^
+	@echo "Testing Mixer Multirotor"
+	@python mixer_multirotor.py --test --mixer-multirotor-binary ./$^
+
+clean:
+	@rm test_mixer_multirotor