-override CFLAGS = -MMD -MF$(DEP_DIR)$(patsubst %.c,%.d,$(patsubst $(TESTSRC_DIR)%,%,$<)) -I. -gdwarf-2 -pedantic -std=$(CSTD) -Wall -Wstrict-prototypes $(OPTIMIZE) -mmcu=$(MCU_TARGET) $(DEFS)
+override CFLAGS_A = -MMD -MF$(DEP_DIR)$(patsubst %.o,%.d,$(notdir $(1))) -I. -Itest_src -gdwarf-2 -pedantic -std=$(CSTD) -Wall -Wstrict-prototypes $(OPTIMIZE) -mmcu=$(MCU_TARGET) $(DEFS)
+override CFLAGS = -MMD -MF$(DEP_DIR)$(patsubst %.o,%.d,$(notdir $@)) -I. -Itest_src -gdwarf-2 -pedantic -std=$(CSTD) -Wall -Wstrict-prototypes $(OPTIMIZE) -mmcu=$(MCU_TARGET) $(DEFS)