最近写了一个递归Makefile,目的是既可以实现子模块的单独编译,也可以不做任何修改就和整个程序的整体进行无缝衔接的编译。具体的思路是借助第三方文件,将子模块编译好的.o文件的路径自动写到config.mk文件中,在总控Makfile中只需要include这个config.mk就可以。单个模块的编译只需要cd到相应目录就可以进行本模块的单独编译,整个程序的编译也只需要cd到顶层目录,分别执行make config
,make
,make install
就可以进行编译和安装。下面这个就是顶层Makefile
CROSS_COMPILE=
#CC=/opt/arm-cross-compile/arm-2010.09/bin/arm-none-linux-gnueabi-gcc
#CC=gcc
CC=arm-linux-gnueabi-gcc
D=-DDEBUG
CFLAGS= -g -O3 $(D)
export CC CFLAGS
INCLUDE_DIR = $(shell cd ./common/include/; pwd)
SUB_DIR= ./entry/
./sqlite/
NFS_DIR:=~/nfs
CORE_NAME = core
$(shell touch config.mk)
include ./config.mk
all:$(OBJS)
$(CC) $(CFLAGS) $^ -lpthread -L/home/jiang/nfs/usr/lib/ -lsqlite3 -o $(CORE_NAME)
config:
@echo "OBJS+=\" > config.mk
@for dir in $(SUB_DIR);
do
echo "
";
$(MAKE) -C $$dir ;
echo "
";
done
clean:
$(RM) ./config.mk
@for dir in $(SUB_DIR);
do
echo "
";
$(MAKE) -C $$dir clean;
echo "
";
done
install:
cp $(CORE_NAME) $(NFS_DIR)
下面这个就是每一个子模块的Makfile,会把编译成功的.o文件路径添加到config.mk中
CUR_DIR=$(shell pwd)
OBJ_DIR:=$(CUR_DIR)/obj
INCLUDE_DIR= -I ./include -I ../common/include
SRC=$(wildcard ./src/*.c)
all:$(SRC)
$(CC) $(CFLAGS) $(INCLUDE_DIR) -c $^
mv ./*.o $(OBJ_DIR)
echo "${OBJ_DIR}/*.o \" >> ../config.mk
echo "