Makefile实现子目录编译

代码目录结构

top

         Makefile

       subdir1

                   Makefile

                   inc/src/obj

        subdir2

                   Makefile

                   obj

                   bottom1

                              inc/src

                   bottom2

                              inc/src

        subdirx

           ......

*Makefile

exclude_dirs:=include bin

#commom must be compiled before any other modules
dirs:=common

subdir=$(shell find . -maxdepth 1 -type d)
dirs+=$(filter-out ./common,$(subdir))
dirs:=$(basename $(patsubst ./%,%,$(dirs)))
dirs:=$(filter-out $(exclude_dirs),$(dirs))

.PHONY: $(dirs) clean

$(dirs):
        @for dir in $(dirs); do \
                $(MAKE) -C $$dir; \
        done

clean:
        @for dir in $(dirs); do \
                $(MAKE) -C $$dir clean; \
        done

子目录结构I    

子目录包含inc/src/obj，将子目录下的源文件的.o文件编译到obj目录

CC=g++

ROOT=.
PROJDIR=$(ROOT)/..
OBJDIR=$(ROOT)/obj
SRCDIR=$(ROOT)/src

TARGET=MFClient
SRCS=$(wildcard $(SRCDIR)/*.cpp)
srcs=$(notdir $(SRCS))
OBJS=$(patsubst %.cpp,$(OBJDIR)/%.o,$(srcs))

ifeq ($(DEBUG),1)
        CFLAGS=-Wall -DDBUG
else
        CFLAGS=-Wall -DRELEASE
endif

ifeq ($(FAKE_SOCKET),1)
CFLAGS+=-D_FAKE_SOCKET
endif

ifeq ($(TEST),1)
CFLAGS+=-D_TEST
endif

INCS=-I$(PROJDIR)/common/inc
INCS+=-I$(PROJDIR)/drivers

LIBS=-lCommon -lDrivers -lTest
LDFLAGS=-L$(PROJDIR)/common/obj
LDFLAGS+=-L$(PROJDIR)/test/obj
LDFLAGS+=-L$(PROJDIR)/drivers/obj

CFLAGS+=$(INCS)

.PHONY: all clean

all:$(TARGET) $(PROJDIR)/common/obj/libCommon.a $(PROJDIR)/drivers/obj/libDrivers.a $(PROJDIR)/test/obj/libTest.a

$(TARGET):$(OBJS)
        $(CC) -o $@ $(OBJS) $(LDFLAGS) $(LIBS)

$(OBJS):$(SRCS)
        
        $(CC) $(CFLAGS) -c $(patsubst %.o,$(SRCDIR)/%.cpp,$(notdir $@)) -o $@

clean:
        @echo "make" $(TARGET) "clean"
        rm -f $(ROOT)/$(TARGET) $(OBJDIR)/*.o

子目录结构II

子目录下包含一个obj和多个二级子目录，二级子目录下包含inc/src，所有源文件编译到统一的obj目录

CC=g++

ROOT=.
PROJDIR=$(ROOT)/..
OBJDIR=$(ROOT)/obj
TARGET=$(OBJDIR)/libDrivers.a

exclude_dirs:=obj
SUBDIR:=$(filter-out $(exclude_dirs),$(basename $(patsubst ./%,%,$(shell find . -maxdepth 1 -type d))))
incs:=$(foreach dir,$(SUBDIR),$(shell ls $(dir)/inc/*.h))
SRCS:=$(foreach dir,$(SUBDIR),$(shell ls $(dir)/src/*.cpp))
file:=$(notdir $(SRCS))
OBJS:=$(patsubst %.cpp,$(OBJDIR)/%.o,$(file))
temp:=$(filter %BusUart.cpp,$(SRCS))

ifeq ($(DEBUG),1)
        CFLAGS=-Wall -DDBUG
else
        CFLAGS=-Wall -DRELEASE
endif

INCS=-I$(PROJDIR)/common/inc
LDFLAGS=
LIBS=

ifeq ($(FAKE_SOCKET),1)
CFLAGS+=-D_FAKE_SOCKET
endif

ifeq ($(FAKE_BUS),1)
CFLAGS+=-D_FAKE_BUS
endif

ifeq ($(TEST),1)
CFLAGS+=-D_TEST
endif

CFLAGS+=$(INCS)

.PHONY: all clean

all:$(TARGET) $(SRCS) $(PROJDIR)/common/obj/libCommon.a

$(TARGET):$(OBJS)
        $(AR) crv $@ $(OBJS) $(LDFLAGS) $(LIBS)

$(OBJS):$(SRCS)
        $(CC) $(CFLAGS) -c $(filter %$(patsubst %o,%cpp,$(notdir $@)),$(SRCS)) -o $@
        
clean:
        @echo "make" $(TARGET) "clean"
        rm -f $(OBJDIR)/*.a $(OBJDIR)/*.o