attribute((unused))的作用

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我是靠谱客的博主勤奋超短裙，这篇文章主要介绍__attribute__((unused))的作用，现在分享给大家，希望可以做个参考。

在分析内核时注意到有些函数会有添加__attribute__((unused))，
在gcc手册中找到了有关的解释：
unused：This attribute, attached to a function, means that the function is meant to be
possibly unused. GCC will not produce a warning for this function.
===============================================================================
used： This attribute, attached to a function, means that code must be emitted for the
function even if it appears that the function is not referenced. This is useful,
for example, when the function is referenced only in inline assembly.

表示该函数或变量可能不使用，这个属性可以避免编译器产生警告信息