5、目录分离

大部分的工程需要分离src、obj、bin，如下：

./
./Makefile
./src/*.c;*.h
./obj/*.o
./bin/<executable>

基于上一个例子修改如下：

# ------------------------
# Generic Makefile
# ------------------------

# Project name
Target = target

# Compile command and flag
CC = gcc
CFLAG =

# Linker command and flag
LINKER = gcc
LFLAG =

# Dir
SRC_DIR = src
OBJ_DIR = obj
BIN_DIR = bin


# Source files
SOURCES  := $(wildcard $(SRC_DIR)/*.c)

# OBJECT files
OBJECTS := $(SOURCES:$(SRC_DIR)/%.c=$(OBJ_DIR)/%.o)

# Header files
INCLUDES := $(wildcard $(SRC_DIR)/*.h)

$(BIN_DIR)/$(Target) : $(OBJECTS)
        $(LINKER) -o $@ $(LFLAG) $(OBJECTS)
        @echo "Linking complete!"

$(OBJECTS) : $(OBJ_DIR)/%.o : $(SRC_DIR)/%.c
        $(CC) $(CFLAG) -c $< -o $@
        @echo "Compilation complete!"

PHONY: clean
clean :
        rm -rf $(BIN_DIR)/$(Target) $(OBJECTS)
        @echo "Cleanup complete!"

注解

基本上只是单纯的定义目录，然后目标文件放到对应目录 。