Recompile only when source code is modified

.gitignore

@@ -1,4 +1,5 @@
 /.vscode/settings.json
 /obj
+/src/**/*.o
 /toolchain
 divinus

build.sh

@@ -14,7 +14,7 @@ toolchain() {
 		fi
 		rm -f $1.$EXT
 	fi
-	make -j $(nproc) -C src -B CC=$PWD/toolchain/$1/bin/$2-$PRE-gcc OPT="$OPT $3"
+	make -j $(nproc) -C src CC=$PWD/toolchain/$1/bin/$2-$PRE-gcc OPT="$OPT $3"
 }
 
 if [ "$2" = "debug" ]; then

src/Makefile

@@ -1,8 +1,14 @@
-OBJ := $(shell find ./ -name '*.c' | sed -e "s/\.c/\.o/")
-
-%.o: %.c
-	@mkdir -p ../obj/$(shell dirname $<)
-	$(CC) $< -I src $(OPT) -c -o ../obj/$@
+SRC = $(shell find ./ -name '*.c')
+OBJ = ../divinus
 
+.PHONY: clean divinus
 divinus: $(OBJ)
-	$(CC) $(addprefix ../obj/,$^) -rdynamic $(OPT) -o ../$@
+
+$(OBJ): $(SRC:%.c=%.o)
+	$(CC) $^ -rdynamic $(OPT) -o $@
+
+%.o: %.c Makefile
+	$(CC) -c $< -o $@
+
+clean:
+	rm -rf $(SRC:%.c=%.o) $(OBJ)