revamp makefile, work on objects

1 files changed, 44 insertions, 5 deletions

diff --git a/Makefile b/Makefile
index 6a17bdc..ca121ed 100644
--- a/Makefile
+++ b/Makefile
@@ -11,21 +11,60 @@ LDFLAGS = -lgcrypt -lev
 
 HEADERS = src/*.h export/include/*.h
 
-all: $(OUT)/$(PLATFORM).bin Makefile SOURCES $(HEADERS)
+DEPS = $(NETCOSM_SRC:.c=.d)
+
+.PHONY: all
+all: $(OUT)/$(PLATFORM).bin Makefile SOURCES $(HEADERS) $(DEPS)
+
+%.o: %.c Makefile %.d
+	@echo "CC $<"
+	@$(CC) $(CFLAGS) $(OPTFLAGS) -c $< -o $@
 
 $(OUT)/$(PLATFORM).bin: $(NETCOSM_OBJ) $(HEADERS) Makefile
 	@mkdir -p $(OUT)
-	@echo "LD $<"
+	@echo "LD $@"
 	@$(CC) $(NETCOSM_OBJ) $(CFLAGS) $(LDFLAGS) -o $(OUT)/$(PLATFORM).bin
 
+# automatically generate dependency rules
+
+%.d : %.c
+	@echo "MKDEP $<"
+	@$(CC) $(CCFLAGS) -MF"$@" -MG -MM -MP -MT"$@" -MT"$(<:.c=.o)" "$<"
+
+# -MF  write the generated dependency rule to a file
+# -MG  assume missing headers will be generated and don't stop with an error
+# -MM  generate dependency rule for prerequisite, skipping system headers
+# -MP  add phony target for each header to prevent errors when header is missing
+# -MT  add a target to the generated dependency
+
+-include $(DEPS)
+
+.PHONY: depend
+depend: $(DEPS)
+	@echo "Dependencies (re)generated."
+
+.PHONY: install
 install: $(OUT)/$(PLATFORM).bin
 	@install $(OUT)/$(PLATFORM).bin /bin/netcosm
 
+.PHONY: clean
 clean:
 	@echo "Cleaning build directory..."
 	@rm -f $(OUT)/$(PLATFORM).bin
 	@rm -f $(NETCOSM_OBJ)
 
-%.o: %.c Makefile $(HEADERS)
-	@echo "CC $<"
-	@$(CC) $(CFLAGS) $(OPTFLAGS) -c $< -o $@
+.PHONY: depclean
+depclean:
+	@echo "Cleaning dependencies..."
+	@rm -f $(DEPS)
+
+.PHONY: veryclean
+veryclean: clean depclean
+
+.PHONY: help
+help:
+	@echo "Cleaning targets:"
+	@echo "  clean		- Remove object files"
+	@echo "  depclean	- Remove dependency files"
+	@echo "  veryclean	- Remove object and dependency files"
+	@echo "Build targets:"