Makefile

CC=g++
CFLAGS=-std=c++0x

TARGET=main
TARGET_DIR=

INC_DIR=. include  
SRC_DIR=. src 

SRC_SUFFIX=cpp

OBJ_DIR_NAME=../.obj
OBJ_SUFFIX=o

head_dir = $(foreach i,$(INC_DIR), -I$i)
cflags = $(head_dir) $(CFLAGS) -g -fpermissive -fno-elide-constructors
ldflags = -lpthread -std=c++14 


######################################################################################

#定义一个变量，用来表示目标.o文件:
#         $1=源文文件目录;
#         $2=源文件后缀(.cpp)
#         $3=目标文件存放的目录名(如.obj)
#         $4=生成的目标文件后缀名(如.o,.arm)
define create_obj
obj_$1 = $(patsubst %.$2, $1/$3/%.$4, $(notdir $(wildcard $1/*.$2)))
endef

#定义obj生成规则模板
#         $1=源文件目录，用来拼出变量名
#         $2=源文件后缀(.cpp)
#         $3=目标文件存放的目录名(如.obj)
#         $4=生成的目标文件后缀名(如.o,.arm)
define rule_o
$$(obj_$1): $1/$3/%.$4:$1/%.$2 $(MAKEFILE_LIST)
	@mkdir -p `dirname $$@`
	@echo -e "   $$(CC)\tCompiling $$< ...."
	@$(CC) $(cflags) -Wp,-MT,$$@ -Wp,-MMD,$$@.d -c -o $$@ $$<
endef


#根据指定的SRC_DIR,调用create_obj生成obj变量
# $(foreach i,$(SRC_DIR), $(eval $(call create_obj,$i,$(SRC_SUFFIX),$(OBJ_DIR_NAME),$(OBJ_SUFFIX))))
$(foreach i,$(SRC_DIR), $(eval $(call create_obj,$i,$(SRC_SUFFIX),$(OBJ_DIR_NAME),$(OBJ_SUFFIX))))
all_obj=$(foreach i,$(SRC_DIR), $(obj_$i))

SUB_MK_DIR=
.PHONY:  $(TARGET) clean $(SUB_MK_DIR)
all:$(SUB_MK_DIR) $(TARGET) 
$(TARGET):$(all_obj) 
	@$(CC) -o $@ $^ $(ldflags)
	@echo "============  Making $(TARGET) OK!! ============" 
	@for i in $(TARGET_DIR);do if [ -d $$i ];then cp $@ $$i;fi;done
clean:
	@rm -f $(TARGET)
	@for d in $(SRC_DIR);do rm -rf $$d/$(OBJ_DIR_NAME); done;
	@echo " Makefile clean ...."	
	@for d in $(SUB_MK_DIR);do make clean -sC $$d; done;
$(SUB_MK_DIR):
	@make -sC $@
	@echo "============  Making $@/Makefile OK!! ============" 
$(foreach i,$(SRC_DIR), $(eval $(call rule_o,$i,$(SRC_SUFFIX),$(OBJ_DIR_NAME),$(OBJ_SUFFIX))))
-include $(patsubst %.$(OBJ_SUFFIX),%.$(OBJ_SUFFIX).d,$(all_obj))