Linux Makefile多目录的编写

手头一个项目，需要编写项目的makefile

多目录结构：

csource/  

├── common
│   └── sqlite3
├── inc
│   ├── curl
│   ├── lua
│   └── Protection
├── lib
│   ├── arm
│   └── linux
├── obj
├── out
│   ├── arm
│   └── linux
├── src

源码目录src，输出目录out，include目录inc，输入链接库目录lib，常用静态函数和sqlite3目录common

makefile如下：

PLAT= none
CC=
CXX=
CFLAGS=
LDFLAGS=
MKDIR_P=mkdir -p

PLATS= linux arm

root= libroot.so
root_a= libroot.a

INC_DIR= ./inc
COM_DIR= ./common
SQL_DIR= ./common/sqlite3
LUA_DIR= ./inc/lua
PRO_DIR= ./inc/Protection
INCLUDE= -I$(LUA_DIR) -I$(INC_DIR) -I$(COM_DIR) -I$(SQL_DIR) -I$(PRO_DIR)
DIR_SRC= ./src

SRC = $(wildcard ${DIR_SRC}/*.cpp)
OBJ = $(patsubst %.cpp,${DIR_OBJ}/%.o,$(notdir ${SRC})) $(DIR_OBJ)/sqlite3.o

SO_TARGET = ${DIR_BIN}/${root}
LIB_TARGET= ${DIR_BIN}/${root_a}


# Targets start here.
default: $(PLAT)

none:
    @echo "Please do 'make PLATFORM' where PLATFORM is one of these:"
    @echo "  $(PLATS)"

${SO_TARGET}:${OBJ}
    $(CXX) $(OBJ) -o $@ $(LDFLAGS)
    cp ${DIR_BIN}/${root} ./test/ -f

${LIB_TARGET}:${OBJ} 
    $(AR) $@ ${OBJ} 
    $(RANLIB) $@

dir:
    $(MKDIR_P) $(DIR_OBJ) $(DIR_BIN);

all:$(SO_TARGET) $(LIB_TARGET)

ALL = dir all

linux:
    $(MAKE) $(ALL) DIR_OBJ="./obj_linux/" DIR_BIN="./out/linux" 
    CC="gcc" CXX="g++" AR="ar rcu" RANLIB="ranlib" 
    CFLAGS="-Wno-write-strings -m32 -O2 -D_DEBUG -D_LINUX -fPIC" 
    LDFLAGS="-O2 -shared -m32 -ldl -pthread -lrt -L./lib/linux -llua -lProtection -lz -lcurl"

arm:
    $(MAKE) $(ALL) DIR_OBJ="./obj_arm/" DIR_BIN="./out/arm" 
    CC="arm-linux-gnueabihf-gcc" CXX="arm-linux-gnueabihf-g++" 
    AR="arm-linux-gnueabihf-ar rcu" RANLIB="arm-linux-gnueabihf-ranlib" 
    CFLAGS="-Wno-write-strings -O2 -D_ARM -D__LINUX -fPIC" 
    LDFLAGS="-O2 -shared -ldl -pthread -lrt -L./lib/arm -llua -lProtection -lz -lcurl"


# list targets that do not create files (but not all makes understand .PHONY)
.PHONY: all $(PLATS) default clean none

${DIR_OBJ}/%.o:${DIR_SRC}/%.cpp 
    $(CXX) $(CFLAGS) $(INCLUDE) -c $< -o $@

${DIR_OBJ}/sqlite3.o:${DIR_SRC}/sqlite3.c 
    $(CC) $(CFLAGS) $(INCLUDE) -c $< -o $@

.PHONY:clean
clean: 
    -find ${DIR_OBJ} -name *.o -exec rm -rf {} ;