继续翻译
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。
后文翻译
本文转自健哥的数据花园博客园博客，原文链接：http://www.cnblogs.com/gaojian/archive/2012/09/20/2694718.html，如需转载请自行联系原作者
