1. 简单Makefile将分布在不同目录文件夹里面的c文件编译成对应的.o文件，然后连接所有的.o文件生成可执行文件：
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CC = gcc
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SRC_PATH = ./ ./src/
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CFLAGS = -c -Wall -O2
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LDFLAG =
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TARGET = test
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SRC = $(foreach pa_th, $(SRC_PATH), $(wildcard $(pa_th)*.c))
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OBJECT = $(patsubst %.c, %.o, $(SRC))
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INCLUDE = $(sort $(addprefix -I, $(dir $(SRC))))
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all:$(TARGET)
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$(TARGET):$(OBJECT)
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$(CC) $^ $(LDLAG) -o $@
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$(OBJECT): %.o :%.c
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$(CC) $(CFLAGS) $< $(INCLUDE) -o $@
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clean:
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-rm -rf *.o test
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.PHONY:clean
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