1、為每個原始檔生成一個可執行程式

使用場景：目錄下的所有原始檔都能生成可執行程式。如在做《C++ Primer》練習時，每個練習都是一個獨立的小程式，不必為每個練習編寫一個Makefile，也不必為每個練習執行g++編譯。

CC :=gcc 
CFLAGS := -g -Wall 
SOURCES := $(wildcard *.c)
TARGETS := $(patsubst %.c,%,$(SOURCES))

#define a function
define MAKE_EACH_SRC_BIN
$1:$1.c
	$(CC) $(CFLAGS) $< -o [email protected]
 

endef

all:$(TARGETS)
	$(foreach target,$(TARGETS),$(call MAKE_EACH_SRC_BIN $(target)))

clean:
	rm -rf $(TARGETS)

2、通用性較強的Makefile

使用場景：可以應對大多數型別的工程，包含多個目錄的工程，不必為每個目錄編寫一個Makefile。自動生成標頭檔案依賴，不必因改變標頭檔案而make clean。

GROOT     :=$(shell pwd)
PROGRAM   := iked
SRCDIRS   := . ./isakmp ./ikev1 ./crypto
SRCEXTS   := .c .cc
CPPFLAGS  := -Wall -Werror -g -m32
CFLAGS    :=  
CFLAGS    += 
CXXFLAGS  := -I/usr/local/openssl/include
CXXFLAGS  += -I$(GROOT)/ -I$(GROOT)/isakmp -I$(GROOT)/crypto -I$(GROOT)/ikev1
LDFLAGS   := -lpthread -L/usr/local/openssl/lib -lcrypto -ldl
LDFLAGS   += -m32 

#CC      = gcc 
#CXX     = g++ 
#CC      = $(CXX)  
#CFLAGS  = $(CXXFLAGS) 
#RM        = rm -f

SHELL   = /bin/sh  
SOURCES = $(foreach d,$(SRCDIRS),$(wildcard $(addprefix $(d)/*,$(SRCEXTS))))  
OBJS    = $(foreach x,$(SRCEXTS), $(patsubst %$(x),%.o,$(filter %$(x),$(SOURCES))))
DEPS    = $(patsubst %.o,%.d,$(OBJS))  
.PHONY : all objs clean cleanall rebuild  
all : $(PROGRAM) 

%.d : %.c  
	@$(CC) -MM -MT ${@:%.d=%.o} -MD $(CXXFLAGS) $< -o 
 
[email protected]
%.d : %.C  
	@$(CC) -MM -MT ${@:%.d=%.o} -MD $(CXXFLAGS) $< -o [email protected]
%.d : %.cc  
	@$(CC) -MM -MT ${@:%.d=%.o} -MD $(CXXFLAGS) $< -o [email protected]
%.d : %.cpp  
	@$(CC) -MM -MT ${@:%.d=%.o} -MD $(CXXFLAGS) $< -o [email protected]
%.d : %.CPP  
	@$(CC) -MM -MT ${@:%.d=%.o} -MD $(CXXFLAGS) $< -o 
 
[email protected]
%.d : %.c++  
	@$(CC) -MM -MT ${@:%.d=%.o} -MD $(CXXFLAGS) $< -o [email protected]
%.d : %.cp  
	@$(CC) -MM -MT ${@:%.d=%.o} -MD $(CXXFLAGS) $< -o [email protected]
%.d : %.cxx  
	@$(CC) -MM -MT ${@:%.d=%.o} -MD $(CXXFLAGS) $< -o [email protected]

objs : $(OBJS)  
%.o : %.c  
	$(CC) -c $(CPPFLAGS) $(CFLAGS) $< -o [email protected] 
%.o : %.C  
	$(CXX) -c $(CPPFLAGS) $(CXXFLAGS) $< -o [email protected] 
%.o : %.cc  
	$(CXX) -c $(CPPFLAGS) $(CXXFLAGS) $< -o [email protected] 
%.o : %.cpp  
	$(CXX) -c $(CPPFLAGS) $(CXXFLAGS) $< -o [email protected] 
%.o : %.CPP  
	$(CXX) -c $(CPPFLAGS) $(CXXFLAGS) $< -o [email protected] 
%.o : %.c++  
	$(CXX) -c $(CPPFLAGS) $(CXXFLAGS) $< -o [email protected] 
%.o : %.cp  
	$(CXX) -c $(CPPFLAGS) $(CXXFLAGS) $< -o [email protected] 
%.o : %.cxx  
	$(CXX) -c $(CPPFLAGS) $(CXXFLAGS) $< -o [email protected] 

$(PROGRAM) : $(OBJS)  
ifeq ($(strip $(SRCEXTS)), .c)  # C file  
	$(CC) -o $(PROGRAM) $(OBJS) $(LDFLAGS)  
else                            # C++ file  
	$(CXX) -o $(PROGRAM) $(OBJS) $(LDFLAGS)  
endif  
-include $(DEPS)  
rebuild: clean all  
clean :  
	@$(RM) $(OBJS) $(DEPS)  
cleanall: clean  
	@$(RM) $(PROGRAM) $(PROGRAM).exe