帶子目錄的makefile文件

1。建立文件夾 dir
　　dir中含 三個文件夾 include source pro 和makefile文件。
　　include 中包含 hai.h頭文件。
　　source 中包含 hello.c文件。
　　pro 中包含 haia.c haib.c文件。
　　
　　makefile文件內容有兩種寫法：
　　makefile 第一種寫法：
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　　CC=gcc ＃選擇編譯器類型爲gcc
　　VPATH= include : pr : source #列明文件存放目錄
　　
　　hello: hello.o haia.o haib.o
　　 $(CC) -o hello hello.o haia.o haib.o
　　hello.o:hello.c hai.h
　　 $(CC) -c hello.c
　　haia.o: haia.c hai.h
　　 $(CC) -c haia.c
　　haib.o: haib.c hai.h
　　 $(CC) -c haib.c
　　.PHONY: clean
　　clean:
　　 rm hello $(obj)
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　　makefile第二種寫法（簡化版）：
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　　CC=gcc #選擇編譯種類
　　
　　VPATH= include : pr : source #在include pr source 三目錄下查找文件
　　
　　obj= hello.o haia.o haib.o ＃
　　
　　hello:$(obj) ＃
　　 $(CC) -o hello $(obj)
　　
　　$(obj): hai.h
　　
　　.PHONY: clean
　　clean:
　　 rm hello $(obj)
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　　hai.h文件內容爲：
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　　#include "stdio.h"
　　extern void haiprinta();
　　extern void haiprintb();
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　　hello.c內容爲：
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　　#include "../include/hai.h"
　　
　　int main(void)
　　{
　　haiprinta();
　　haiprintb();
　　return 0;
　　}
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　　haia.c內容爲：
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　　#include "../include/hai.h"
　　
　　void haiprinta()
　　{
　　printf("hai aaaaaaaaaa\n");
　　}
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　　haib.c內容爲：
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　　#include "../include/hai.h"
　　
　　void haiprintb()
　　{
　　printf("haib bbbbbbbbbbbbbb\n");
　　}
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　　2。make 調用makefile生成 可執行文件 hello
　　
　　3. 運行 hello顯示打印結果：
　　[HAI@localhost wulong]$ ./hello
　　hai aaaaaaaaaa
　　haib bbbbbbbbbbbbbb
　　[HAI@localhost wulong]$
　　
　　到此結束，恭喜！