Add compilation step

Makefile

@@ -24,13 +24,17 @@ BUILD_DIR = build
 
 SRC_FILES := $(wildcard $(SRC_DIR)/*.c)
 PREP_FILES := $(patsubst $(SRC_DIR)/%.c,$(BUILD_DIR)/%.i,$(SRC_FILES))
+ASM_FILES := $(patsubst $(BUILD_DIR)/%.i,$(BUILD_DIR)/%.S,$(PREP_FILES))
 
 .PHONY: build
-build: builddir preprocess
+build: builddir preprocess compile
 
 $(BUILD_DIR)/%.i: $(SRC_DIR)/%.c
 	$(CC) $(CFLAGS) -E $^ -o $@
 
+$(BUILD_DIR)/%.S: $(BUILD_DIR)/%.i
+	$(CC) $(CFLAGS) -S $^ -o $@
+
 .PHONY: builddir
 builddir:
 	mkdir $(BUILD_DIR)
@@ -38,6 +42,9 @@ builddir:
 .PHONY: preprocess
 preprocess: $(PREP_FILES)
 
+.PHONY: compile
+compile: preprocess $(ASM_FILES)
+
 .PHONY: clean
 clean:
 	rm -rf $(BUILD_DIR)