c - MISRA 2012 规则 8.10 静态内联

Question

为什么 MISRA 建议使用static存储类声明内联函数？虽然关键字inline提示编译器将所有函数调用替换为实际的函数体，并且编译器可能会也可能不会执行它，但如何给出内部链接(static) 或函数的外部链接 (extern) 会影响编译器的内联操作吗？

Answer 1

MISRA C:2012 给出了规则 8.10 的基本原理:

Rationale

If an inline function is declared with external linkage but not defined in the same translation unit, the behaviour is undefined.

A call to an inline function declared with external linkage may call the external definition of the function, or it may use the inline definition. Although this should not affect the behaviour of the called function, it might affect execution timing and therefore have an impact on a real-time program.