GNU make manual 翻译(五十)

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   If you do not specify any makefiles to be read with `-f' or `--file'
options, `make' will try the default makefile names; *note What Name to 
Give Your Makefile: Makefile Names.  Unlike makefiles explicitly  
requested with `-f' or `--file' options, `make' is not certain that 
these makefiles should exist.  However, if a default makefile does not 
exist but can be created by running `make' rules, you probably want the 
rules to be run so that the makefile can be used.                        
                        
   Therefore, if none of the default makefiles exists, `make' will try 
to make each of them in the same order in which they are searched for 
(*note What Name to Give Your Makefile: Makefile Names.)  until it  
succeeds in making one, or it runs out of names to try.  Note that it 
is not an error if `make' cannot find or make any makefile; a makefile 
is not always necessary.                        

 如果你没有通过 -f 或 --file 来指定 makefile，那么 make 将会尝试缺省的 makefile名称。

(*note What Name to Give Your Makefile: Makefile Names)

如果不显式指定 -f 或 --file 选项，那么 make 是不清楚这些 makefile 是否存在的。

但是，如果一个缺省的 makefile 并不存在，但却可以通过 运行 make 规则来生成，那么你可能希望此规则得到运行以便此 makefile可以被生成和使用。

因此，如果没有缺省的makefile存在，那么make 将会试图按照它们被搜索的顺序来制作它们(*note What Name to Give Your Makefile: Makefile Names.)，知道它成功地生成了一个，或者已经试遍了所有文件。请注意如果make 不能制作或找到任何makefile，它也不是一个错误，makefile并不总是必须的。

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