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Secondary Expansion of Static Pattern Rules
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Rules for secondary expansion of static pattern rules are identical to those for explicit rules, above, with one exception: for static pattern rules the `$$*' variable is set to the pattern stem. As with explicit rules, `$$?' is not available and expands to the empty string.
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对静态规则的二次扩展，和对显式规则的二次扩展完全类似。但是有一个例外：
对静态规则，$$* 变量被设置为 模式 stem。$$? 无法使用于静态规则，会扩展为空串。
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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/2012/09/18/2688819.html，如需转载请自行联系原作者
