makefile: updated the dependencies handling method

the makefile now generates .d files and is more robust

Signed-off-by: Olivier Gayot <duskcoder@gmail.com>

1 files changed, 22 insertions, 17 deletions

diff --git a/Makefile b/Makefile
index e01cd74..6c561a4 100644
--- a/Makefile
+++ b/Makefile
@@ -1,30 +1,35 @@
-CC       ?= gcc
-CFLAGS   += -W -Wall -std=c99 -Wextra $(shell sdl-config --cflags)
-LDFLAGS  += $(shell sdl-config --libs) -lSDL_image -lSDL_ttf
-NAME      = rpg
-SRC       = $(wildcard *.c)
+NAME            = rpg
+SRC             = $(wildcard *.c)
 
-all: depend $(NAME)
+CPPFLAGS       += $(shell sdl-config --cflags)
+LDFLAGS        += $(shell sdl-config --libs) -lSDL_image -lSDL_ttf
+CFLAGS         += -W -Wall -Wextra -std=gnu99
 
-depend: .depend
+CC              = gcc
 
-.depend: $(SRC)
-	@$(RM) .depend
-	@$(CC) $(CFLAGS) -MM $^ > .depend
+OBJ             = $(SRC:.c=.o)
+DEP             = $(SRC:.c=.d)
 
-include .depend
-
-OBJ     = $(SRC:.c=.o)
+all: $(NAME)
 
 $(NAME): $(OBJ)
 	$(CC) -o $@ $^ $(LDFLAGS)
 
+-include $(DEP)
+
+%.d: %.c
+	$(CC) -MM $(CPPFLAGS) $(CFLAGS) $< -MF $@ -MT "$*.o $@"
+
 clean:
 	$(RM) $(OBJ)
-
-fclean: clean
 	$(RM) $(NAME)
 
-re: fclean all
+mrproper: clean
+	$(RM) $(DEP)
+
+distclean: mrproper
+	$(RM) $(addsuffix ~,$(SRC))
+	$(RM) $(wildcard $(addsuffix .sw*,$(addprefix .,$(SRC))))
+
+.PHONY: all clean mrproper distclean
 
-.PHONY: all depend clean fclean all re