diff --git a/Makefile b/Makefile
index 53a7ea6..490914c 100644
--- a/Makefile
+++ b/Makefile
@@ -11,7 +11,13 @@ TESTBENCH_V = hdl/tb/core_tb.v
 # ================
 # Software options
 # ================
-CC = riscv64-linux-gnu-gcc
+# SOURCE_C = $(wildcard test/*.c)
+SOURCE_C = 
+SOURCE_AS = $(wildcard test/*.S)
+OBJ = $(addprefix $(BUILD_DIR)/, $(notdir $(SOURCE_AS:.S=.o)))
+OBJ += $(addprefix $(BUILD_DIR)/, $(notdir $(SOURCE_C:.c=.o)))
+
+CC = riscv64-linux-gnu-gcc-8
 # CFLAGS = -march=rv32i -mabi=ilp32
 CFLAGS = -march=rv64i -mabi=lp64
 
@@ -34,7 +40,7 @@ $(BUILD_DIR)/%.o: test/%.S | $(BUILD_DIR)
 $(BUILD_DIR)/%.o: test/%.c | $(BUILD_DIR)
 	$(CC) $(CFLAGS) $^ -o $@
 
-$(BUILD_DIR)/%.elf: test/%.ld $(BUILD_DIR)/%.o | $(BUILD_DIR)
+$(BUILD_DIR)/%.elf: test/%.ld $(OBJ) | $(BUILD_DIR)
 	$(LD) $(LDFLAGS) $^ -o $@
 
 %.hex: %.elf
diff --git a/test/main.c b/test/main.c
new file mode 100644
index 0000000..134ac38
--- /dev/null
+++ b/test/main.c
@@ -0,0 +1,4 @@
+void main()
+{
+    
+}
\ No newline at end of file