GNU make manual 翻译( 九十八)

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4.6 Phony Targets
=================

   A phony target is one that is not really the name of a file; rather it is just a name for a recipe to be executed when you make an explicit request.  There are two reasons to use a phony target: to avoid a conflict with a file of the same name, and to improve performance.

   If you write a rule whose recipe will not create the target file, the recipe will be executed every time the target comes up for remaking. Here is an example:

     clean:
             rm *.o temp

Because the `rm' command does not create a file named `clean', probably no such file will ever exist.  Therefore, the `rm' command will be executed every time you say `make clean'.  

4.6 伪目标
=================

伪目标不是一个文件的真实名字，它其实只是一个，你给make显式要求时要执行的片段的名字。

有两个原因需要使用伪目标: 防止和同名的文件冲突，提高性能。

如果你写了一个规则，其片段不是要创建目的文件，这个规则可以每次运行。下面是一个例子：

clean:
rm *.o temp

因为 rm 命令不生成一个名为 clean 的文件，可能这个文件也永远不会存在，因此，每次你输入 make clean 时，这个rm 命令都会得到执行。

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