一个简单通用的makefile

# a simple makefile
CXX		= g++
CXXFLAGS= -g -O -Wall

APPNAME	= app

ALLDIRS	= $(shell find . -name '*' -type d)
DIRFILES= $(wildcard $(dir)/*.cpp)
ALLFILES:= $(foreach dir,$(ALLDIRS),$(DIRFILES))

SOURCES	:= $(ALLFILES)
OBJECTS := $(SOURCES:.cpp=.o)

.PHONY:all clean

all:$(APPNAME)
$(APPNAME): $(OBJECTS)
$(CXX) $(CXXFLAGS) -o $@ $^

$(OBJECTS):%.o:%.cpp
$(CXX) $(CXXFLAGS) -c $^ -o $@

clean:
rm -f $(APPNAME) $(OBJECTS)